Pub Date : 2020-01-01DOI: 10.37904/metal.2020.3482
P. Szkandera, M. Sadilek, S. Rusz, Pavel Dostal, J. Dubský, J. Zelinka, Ondřej Kotásek
The article is focused on the process of severe plastic deformation (SPD). New method using the SPD principle (DRECE) is described in the article. New method using the severe plastic deformation (DRECE) is particularly suitable for forming metal materials. Materials produced by this technology are characterized by increasing mechanical properties while maintaining sufficient ductility of the materials. In the practical part of the work, experiments were carried out on DC01 steel using the DRECE method. Sheet metal strips were formed through one to seven passes by DRECE method. The thickness of the formed strips was 2 mm, the strips width was 59 mm and the strips length were 1000 mm. The dimensions of the sheet metal strips were limited only by the design of the forming device using the method severe plastic deformation (DRECE). The experiment was performed on a forming tool with angle in the deformation material zone 108 °. The experiment was demonstrated on all sheet metal strips under the same forming conditions. The aim of the experiments was to verify the influence of the number of passes by the forming device on the achieved mechanical properties of the steel. The final part of the article describes the achieved mechanical properties of the sheet metal strip after forming by the DRECE method.
{"title":"Increasing the mechanical properties of DC01 steel by the DRECE method of severe plastic deformation","authors":"P. Szkandera, M. Sadilek, S. Rusz, Pavel Dostal, J. Dubský, J. Zelinka, Ondřej Kotásek","doi":"10.37904/metal.2020.3482","DOIUrl":"https://doi.org/10.37904/metal.2020.3482","url":null,"abstract":"The article is focused on the process of severe plastic deformation (SPD). New method using the SPD principle (DRECE) is described in the article. New method using the severe plastic deformation (DRECE) is particularly suitable for forming metal materials. Materials produced by this technology are characterized by increasing mechanical properties while maintaining sufficient ductility of the materials. In the practical part of the work, experiments were carried out on DC01 steel using the DRECE method. Sheet metal strips were formed through one to seven passes by DRECE method. The thickness of the formed strips was 2 mm, the strips width was 59 mm and the strips length were 1000 mm. The dimensions of the sheet metal strips were limited only by the design of the forming device using the method severe plastic deformation (DRECE). The experiment was performed on a forming tool with angle in the deformation material zone 108 °. The experiment was demonstrated on all sheet metal strips under the same forming conditions. The aim of the experiments was to verify the influence of the number of passes by the forming device on the achieved mechanical properties of the steel. The final part of the article describes the achieved mechanical properties of the sheet metal strip after forming by the DRECE method.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90326172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.37904/metal.2020.3525
D. Siwiec, R. Dwornicka, A. Pacana
The micro-alloyed steel 38MnVS6 (38MnSiVS5 or 38MnVS5) applied mostly in the automotive industry (for example production of forgings), has a high yield point and relatively good wear resistance. Aim of the study was preliminary to analyse the influence of twice the normalization process of micro-alloyed steel 38MnVS6 on its microstructure and mechanical properties. The normalization process was made in two steps in a pusher furnace PP-300 at temperatures 910 °C (cooling under the fan 5200 rpm) and 880 °C (cooling in open air). The total normalization time was 16200 seconds each time. Yield strength, tensile strength and hardness were analysed. Analysis was occurred based on results of the normalization process of three forgings for use in the automotive industry, ball-shaped and weight 28 N, forged from a temperature of 1250 ° C from micro-alloyed steel 38MnVS6. It has been shown that carrying out two processes for normalizing micro-alloy steel 38MnVS6 allows achieving its homogeneous and fine-grained microstructure and obtaining better mechanical properties and thus filled the gap regarding the lack of analysis of the impact of the normalization process on 38MnVS6 steel.
{"title":"improving the process of achieving required microstructure and mechanical properties of 38mnvs6 steel","authors":"D. Siwiec, R. Dwornicka, A. Pacana","doi":"10.37904/metal.2020.3525","DOIUrl":"https://doi.org/10.37904/metal.2020.3525","url":null,"abstract":"The micro-alloyed steel 38MnVS6 (38MnSiVS5 or 38MnVS5) applied mostly in the automotive industry (for example production of forgings), has a high yield point and relatively good wear resistance. Aim of the study was preliminary to analyse the influence of twice the normalization process of micro-alloyed steel 38MnVS6 on its microstructure and mechanical properties. The normalization process was made in two steps in a pusher furnace PP-300 at temperatures 910 °C (cooling under the fan 5200 rpm) and 880 °C (cooling in open air). The total normalization time was 16200 seconds each time. Yield strength, tensile strength and hardness were analysed. Analysis was occurred based on results of the normalization process of three forgings for use in the automotive industry, ball-shaped and weight 28 N, forged from a temperature of 1250 ° C from micro-alloyed steel 38MnVS6. It has been shown that carrying out two processes for normalizing micro-alloy steel 38MnVS6 allows achieving its homogeneous and fine-grained microstructure and obtaining better mechanical properties and thus filled the gap regarding the lack of analysis of the impact of the normalization process on 38MnVS6 steel.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88162955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.37904/metal.2020.3475
I. Volokitina, A. Volokitin, Yevgeniy Panin, M. Latypova
This work is devoted to one of the most important problems of modern physics of strength and plasticity – to the behavior of metals under various conditions of intense external influences. These are large plastic deformations, the formation of nanocrystalline structures under these conditions, complex cooperative dynamic processes in the zones of deformation localization, low temperatures or high deformation rates, highstrength materials, etc. The relevance of this problem is due to the use of intensive external influences in numerous new technologies for obtaining and processing metal materials. To implement the high-pressure torsion process on a hydraulic single-column press, a special design matrix has been developed that allows the high-pressure torsion process to be implemented due to the linear movement of the striker relative to the frame. For investigation of this process, a FEM simulation using Deform program was used. Results of the study of the strain state showed that after 10 deformation cycles the average strain value is about 3,8. Results of the study of the stress state showed that compressive stresses prevail in the deformation zone. The tensile stresses are concentrated mainly on the periphery of the workpiece, its value is about 1080 MPa. Despite of high level of tensile stresses the value of compressive stresses is more than 3 times.
{"title":"DEFORMATION OF TITANIUM BY THE HIGH PRESSURE TORSION METHOD","authors":"I. Volokitina, A. Volokitin, Yevgeniy Panin, M. Latypova","doi":"10.37904/metal.2020.3475","DOIUrl":"https://doi.org/10.37904/metal.2020.3475","url":null,"abstract":"This work is devoted to one of the most important problems of modern physics of strength and plasticity – to the behavior of metals under various conditions of intense external influences. These are large plastic deformations, the formation of nanocrystalline structures under these conditions, complex cooperative dynamic processes in the zones of deformation localization, low temperatures or high deformation rates, highstrength materials, etc. The relevance of this problem is due to the use of intensive external influences in numerous new technologies for obtaining and processing metal materials. To implement the high-pressure torsion process on a hydraulic single-column press, a special design matrix has been developed that allows the high-pressure torsion process to be implemented due to the linear movement of the striker relative to the frame. For investigation of this process, a FEM simulation using Deform program was used. Results of the study of the strain state showed that after 10 deformation cycles the average strain value is about 3,8. Results of the study of the stress state showed that compressive stresses prevail in the deformation zone. The tensile stresses are concentrated mainly on the periphery of the workpiece, its value is about 1080 MPa. Despite of high level of tensile stresses the value of compressive stresses is more than 3 times.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"143 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86449679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.37904/metal.2020.3449
V. Novák, L. Řeháčková, Petr Klus, B. Smetana, S. Rosypalová, Ľ. Drozdová, J. Dobrovskâ
Traditional routes of ironmaking and steelmaking processes demand high-temperature preparatory steps, such as coking and sintering. These processes are of great concern since they represent a considerable environmental burden. As an alternative, carbon-containing iron oxides agglomerates (sinters) can be used. In this work, the assessment of thermoplastic properties of prepared sinters, especially the determination of softening and liquidus temperatures, was performed by two methods: optical and spindle drop method. For the first-mentioned method, high-temperature observation furnace CLASIC was employed, which enables observation of changes in specimen shape depending on temperature. While in the case of the second method, Furnace Rheometer System FRS 1600 was used. This system allows measuring changes of spindle height as a function of temperature when different normal forces, in specific 3 and 20 N, are applied. Besides, analyzed sinters were of different grain sizes and contained approximately 59 wt.% of iron and 7.2 wt.% of iron(II) oxide. The samples were measured up to liquidus temperature at various heating rates in an inert atmosphere of argon gas. In summary, a good agreement between phase transformation temperatures measured by both methods was achieved, and the influence of experimental conditions on these temperatures was confirmed.
{"title":"Experimental study of thermoplastic properties of agglomerate","authors":"V. Novák, L. Řeháčková, Petr Klus, B. Smetana, S. Rosypalová, Ľ. Drozdová, J. Dobrovskâ","doi":"10.37904/metal.2020.3449","DOIUrl":"https://doi.org/10.37904/metal.2020.3449","url":null,"abstract":"Traditional routes of ironmaking and steelmaking processes demand high-temperature preparatory steps, such as coking and sintering. These processes are of great concern since they represent a considerable environmental burden. As an alternative, carbon-containing iron oxides agglomerates (sinters) can be used. In this work, the assessment of thermoplastic properties of prepared sinters, especially the determination of softening and liquidus temperatures, was performed by two methods: optical and spindle drop method. For the first-mentioned method, high-temperature observation furnace CLASIC was employed, which enables observation of changes in specimen shape depending on temperature. While in the case of the second method, Furnace Rheometer System FRS 1600 was used. This system allows measuring changes of spindle height as a function of temperature when different normal forces, in specific 3 and 20 N, are applied. Besides, analyzed sinters were of different grain sizes and contained approximately 59 wt.% of iron and 7.2 wt.% of iron(II) oxide. The samples were measured up to liquidus temperature at various heating rates in an inert atmosphere of argon gas. In summary, a good agreement between phase transformation temperatures measured by both methods was achieved, and the influence of experimental conditions on these temperatures was confirmed.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76720474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.37904/metal.2020.3488
Amar Boudedja, Aghiles Hannaou, Siham Ben Abdesselam, M. Almansba
Folding is a common industry practice. In this work we have studied the influence of some parameters such as (the radius of curvature of the matrix, the coefficient of friction between the punch and the specimen, the play between matrix and punch, the thickness of the specimen and the mesh of the specimen) on the deformations of the different zones of the specimen, by a numerical simulation of U-bending using the ABAQUS calculation code. The studied parameters will prove to be of relevant use for the design of the parts from the metal sheets, through the bending forming process. Numerical simulation is a good decision support tool for parts manufacturing companies. For the continuation of this work, a phenomenological model developed by IWAMOTO has been selected and modified to include the evolution of the microstructure (from austenite to martensite) after deformation.
{"title":"NUMERICAL STUDY OF THE BENDING OF STEEL SHEETS TRIP 304L","authors":"Amar Boudedja, Aghiles Hannaou, Siham Ben Abdesselam, M. Almansba","doi":"10.37904/metal.2020.3488","DOIUrl":"https://doi.org/10.37904/metal.2020.3488","url":null,"abstract":"Folding is a common industry practice. In this work we have studied the influence of some parameters such as (the radius of curvature of the matrix, the coefficient of friction between the punch and the specimen, the play between matrix and punch, the thickness of the specimen and the mesh of the specimen) on the deformations of the different zones of the specimen, by a numerical simulation of U-bending using the ABAQUS calculation code. The studied parameters will prove to be of relevant use for the design of the parts from the metal sheets, through the bending forming process. Numerical simulation is a good decision support tool for parts manufacturing companies. For the continuation of this work, a phenomenological model developed by IWAMOTO has been selected and modified to include the evolution of the microstructure (from austenite to martensite) after deformation.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86495392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.37904/metal.2020.3453
J. Vontorová, J. Beňo, Martin Krysmánek, K. Slamová
The article deals with the determination of sulphur contents in different types of foundry furan no-bake reclaims from different suppliers using two different methods – combustion elemental analysis and gravimetrically. The first of these methods is the standard fast instrumental method. The work aimed to prove if it could be replaced by the method of traditional analysis, which does not have high demands on instruments.
{"title":"COMPARISON OF METHODS FOR DETERMINATION OF SULPHUR IN RECLAIMED sand","authors":"J. Vontorová, J. Beňo, Martin Krysmánek, K. Slamová","doi":"10.37904/metal.2020.3453","DOIUrl":"https://doi.org/10.37904/metal.2020.3453","url":null,"abstract":"The article deals with the determination of sulphur contents in different types of foundry furan no-bake reclaims from different suppliers using two different methods – combustion elemental analysis and gravimetrically. The first of these methods is the standard fast instrumental method. The work aimed to prove if it could be replaced by the method of traditional analysis, which does not have high demands on instruments.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"150 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79863853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.37904/metal.2020.3633
M. Kalenga, Motshoea Thunka, D. Nyembwe
The depletion of ores from the first sources on one hand has led to using damped materials that contain valuable metals to be recycled while environmental threats are being targeted and on the other hand high price of reductant coupled with their depletion have caused a stir in the metallurgical industry. Many slags are currently recycled for the recovery of valuable metals while new reductants are being tested for eventually replace the generic reductants. In this work, copper slag from Water-jacket furnace have been used to recover copper in presence of raw palm nutshells as possible replacement of generic reductants. Characterisation of the copper slag, the palm nutshells and products were conducted using XRD, XRF and SEM-EDS. Results have shown that dominants elements in the slag were Fe 33.83 wt%, Zn 6.73 wt%, Cu 1.26 wt%. Raw palm nutshells analyses revealed 6.39 wt% moisture, 61.56 wt% volatile matters and 4.35 wt% ash content while fixed carbon amounted to be 27.89 % and loss of ignition (LOI) 91.8 %. The reduction experiments were conducted in a horizontal tube furnace at 1300 °C under argon to create an inert environment and efficiently test the reducing capability of the palm nutshells. The composition of the metal produced revealed 41.84 wt% Cu, 26.41 wt% Co and 31.75 wt% Fe. However, it was noticed that the miscibility of the metal and the slag was prominent. As a first attempt, results showed very promising and further investigations are required to reveal optimums
{"title":"Investigation on possible use of palm Nutshells as Reductant for the Reduction of copper slag for copper recovery","authors":"M. Kalenga, Motshoea Thunka, D. Nyembwe","doi":"10.37904/metal.2020.3633","DOIUrl":"https://doi.org/10.37904/metal.2020.3633","url":null,"abstract":"The depletion of ores from the first sources on one hand has led to using damped materials that contain valuable metals to be recycled while environmental threats are being targeted and on the other hand high price of reductant coupled with their depletion have caused a stir in the metallurgical industry. Many slags are currently recycled for the recovery of valuable metals while new reductants are being tested for eventually replace the generic reductants. In this work, copper slag from Water-jacket furnace have been used to recover copper in presence of raw palm nutshells as possible replacement of generic reductants. Characterisation of the copper slag, the palm nutshells and products were conducted using XRD, XRF and SEM-EDS. Results have shown that dominants elements in the slag were Fe 33.83 wt%, Zn 6.73 wt%, Cu 1.26 wt%. Raw palm nutshells analyses revealed 6.39 wt% moisture, 61.56 wt% volatile matters and 4.35 wt% ash content while fixed carbon amounted to be 27.89 % and loss of ignition (LOI) 91.8 %. The reduction experiments were conducted in a horizontal tube furnace at 1300 °C under argon to create an inert environment and efficiently test the reducing capability of the palm nutshells. The composition of the metal produced revealed 41.84 wt% Cu, 26.41 wt% Co and 31.75 wt% Fe. However, it was noticed that the miscibility of the metal and the slag was prominent. As a first attempt, results showed very promising and further investigations are required to reveal optimums","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83585444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.37904/metal.2020.3467
Yu. V. Gamin, A. Koshmin, A. Dolbachev
The main goal of this study is to analyze the influence of radial-shear rolling (RSR) modes on the structure and properties of 1050A using finite element modeling (FEM) and experimental verification of the results. Ingots with a diameter of 60 mm were obtained, which were rolled into rods with a diameter of 14 mm at different regimes (total elongation ratio µ = 18.4). After rolling, the evolution of the microstructure and mechanical properties of the resulting rods were investigated. It is established that during RSR process the nonuniform change in temperature-velocity and deformation parameters occurs in the volume of deformable body, which determines the forming of gradient spiral structure. FEM was used for good understanding processes of microstructure evolution and properties depending on parameters of RSR methods. Based on the FEM simulation the change in temperature and strain rates in the volume of deformed body at different temperature (T=25 up to 350 °C) was obtained. Depending on the selected temperature-velocity parameters it is possible to obtain a different combination of mechanical properties (UTS ~ 94 up to 20 MPa; YS ~ 88 up to 110 MPa; e = 1 up to 43.5 %). The strength of obtained RSR rods from 1050A alloy at all regimes is significantly higher than the strength of industrial rods in a hot-pressed condition that shows the application prospect of RSR process as efficient method of controlled plastic deformation of aluminum alloys and obtaining long rods.
{"title":"study of radial-shear rolling features and properties evolution of 1050A aluminum alloy","authors":"Yu. V. Gamin, A. Koshmin, A. Dolbachev","doi":"10.37904/metal.2020.3467","DOIUrl":"https://doi.org/10.37904/metal.2020.3467","url":null,"abstract":"The main goal of this study is to analyze the influence of radial-shear rolling (RSR) modes on the structure and properties of 1050A using finite element modeling (FEM) and experimental verification of the results. Ingots with a diameter of 60 mm were obtained, which were rolled into rods with a diameter of 14 mm at different regimes (total elongation ratio µ = 18.4). After rolling, the evolution of the microstructure and mechanical properties of the resulting rods were investigated. It is established that during RSR process the nonuniform change in temperature-velocity and deformation parameters occurs in the volume of deformable body, which determines the forming of gradient spiral structure. FEM was used for good understanding processes of microstructure evolution and properties depending on parameters of RSR methods. Based on the FEM simulation the change in temperature and strain rates in the volume of deformed body at different temperature (T=25 up to 350 °C) was obtained. Depending on the selected temperature-velocity parameters it is possible to obtain a different combination of mechanical properties (UTS ~ 94 up to 20 MPa; YS ~ 88 up to 110 MPa; e = 1 up to 43.5 %). The strength of obtained RSR rods from 1050A alloy at all regimes is significantly higher than the strength of industrial rods in a hot-pressed condition that shows the application prospect of RSR process as efficient method of controlled plastic deformation of aluminum alloys and obtaining long rods.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"89 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84456443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.37904/metal.2020.3522
B. Behrens, K. Brunotte, H. Wester, F. Müller
Due to the efficient combination of a forming step with a consecutive heat treatment, hot-stamping has become an established technology for the production of high strength steel parts in the automotive industry. In the beginning, sheets are heated above austenitisation temperature and held in order to obtain a fully austenised microstructure, then formed and instantly quenched in the forming tool. To achieve the desired increase in tensile strength for the widely used manganese boron steel 22MnB5, cooling rates of at least 27 K/s are necessary. This requirement sets a high demand on the numerical process simulation in order to being able to predict the occurrence of component or process errors with a high degree of certainty. To achieve this, the exact knowledge of the local heat transfer coefficient is necessary, which dominantly determines the temperature distribution within the work piece and the die. Since there is none standardised test method for the determination of heat transfer coefficients exists, a practical test method is presented in this study. In addition to the use of a divisible temperature-measuring stamp, the method is based on a close coupling of practical experiment and iterative numerical simulation. With the method and tools shown in the scope of this paper, the heat transfer coefficient could be successfully determined as a function of contact pressure and tool start temperature, taking the process route of hot-stamping into account. Results are compared with literature knowledgeorder to demonstrate the performance of the determination method.
{"title":"Practical process characterisation for hot-stamping regarding the heat transfer coefficient using a numerical and experimental coupled method","authors":"B. Behrens, K. Brunotte, H. Wester, F. Müller","doi":"10.37904/metal.2020.3522","DOIUrl":"https://doi.org/10.37904/metal.2020.3522","url":null,"abstract":"Due to the efficient combination of a forming step with a consecutive heat treatment, hot-stamping has become an established technology for the production of high strength steel parts in the automotive industry. In the beginning, sheets are heated above austenitisation temperature and held in order to obtain a fully austenised microstructure, then formed and instantly quenched in the forming tool. To achieve the desired increase in tensile strength for the widely used manganese boron steel 22MnB5, cooling rates of at least 27 K/s are necessary. This requirement sets a high demand on the numerical process simulation in order to being able to predict the occurrence of component or process errors with a high degree of certainty. To achieve this, the exact knowledge of the local heat transfer coefficient is necessary, which dominantly determines the temperature distribution within the work piece and the die. Since there is none standardised test method for the determination of heat transfer coefficients exists, a practical test method is presented in this study. In addition to the use of a divisible temperature-measuring stamp, the method is based on a close coupling of practical experiment and iterative numerical simulation. With the method and tools shown in the scope of this paper, the heat transfer coefficient could be successfully determined as a function of contact pressure and tool start temperature, taking the process route of hot-stamping into account. Results are compared with literature knowledgeorder to demonstrate the performance of the determination method.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79715091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.37904/metal.2020.3656
M. Mazur, K. Czerwińska, A. Pacana
The purpose of the conducted tests was to apply an integrally configured method of quality control of the condition of modified helicopter gearbox housing castings. The use of this innovative method (consisting of the following techniques: Pareto-Lorenz diagram, Ishikawa diagram and 5WHY method?). would contribute to identifying the causes of non-compliant castings and, consequently, to eliminating non-compliant castings. As part of the analysis of the efficiency of checkpoints, a non-conformity test was carried out on the gearbox housing castings under analysis, including the identification of sensitive areas in terms of the number of defects. Transmission housing casts have become the subject of research due to significant problems with maintaining their desired level of quality after the introduced structural and technological changes. The proposed method has helped to identify the root cause of non-compliance. These were: inadequate flooding of moulds due to insufficient employee qualifications and inadequate human resources management. The study shows the advisability of using an integrated approach to finding the causes of quality problems on the example of a foundry. This was a new solution for the company, as no in-depth analyses of quality problems using a sequence of quality management techniques have been conducted so far. The improvement actions taken so far have been sufficient in a stabilised production process, but the modification of the process has shown the need to seek other more advanced techniques. This configured and integrated method was proposed and the expected results were achieved. The sequential method developed in the study is a universal way to prevent future non-compliance in this or other companies.
{"title":"ANALYSIS OF THE CAUSES OF INCOMPATIBILITY OF GEARBOX HOUSING CASTING","authors":"M. Mazur, K. Czerwińska, A. Pacana","doi":"10.37904/metal.2020.3656","DOIUrl":"https://doi.org/10.37904/metal.2020.3656","url":null,"abstract":"The purpose of the conducted tests was to apply an integrally configured method of quality control of the condition of modified helicopter gearbox housing castings. The use of this innovative method (consisting of the following techniques: Pareto-Lorenz diagram, Ishikawa diagram and 5WHY method?). would contribute to identifying the causes of non-compliant castings and, consequently, to eliminating non-compliant castings. As part of the analysis of the efficiency of checkpoints, a non-conformity test was carried out on the gearbox housing castings under analysis, including the identification of sensitive areas in terms of the number of defects. Transmission housing casts have become the subject of research due to significant problems with maintaining their desired level of quality after the introduced structural and technological changes. The proposed method has helped to identify the root cause of non-compliance. These were: inadequate flooding of moulds due to insufficient employee qualifications and inadequate human resources management. The study shows the advisability of using an integrated approach to finding the causes of quality problems on the example of a foundry. This was a new solution for the company, as no in-depth analyses of quality problems using a sequence of quality management techniques have been conducted so far. The improvement actions taken so far have been sufficient in a stabilised production process, but the modification of the process has shown the need to seek other more advanced techniques. This configured and integrated method was proposed and the expected results were achieved. The sequential method developed in the study is a universal way to prevent future non-compliance in this or other companies.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88160380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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