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}
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.2020.3647
M. Ingaldi, M. Mazur
Appropriate maintenance of machinery and production equipment allows for smooth production, eliminates downtime related to failures, improves work safety and improves the productivity of an enterprise. Well-functioning machines allow for production of high-quality products. This is an important topic especially in enterprises of the metallurgical industry due to the specificity. They usually work in system 24/7, what is more, machines and devices are used in the most effective way possible. In addition, an important factor is the ability to produce products with appropriate quality parameters, because many of these products are used, e.g. in various machines, vehicles, constructions or buildings. The purpose of the paper was to assess the production devices of one of the rolling mills in Poland in terms of its condition and use. Chosen technical and technological indicators typical of metallurgical enterprises were used for this assessment. This research covered 5 consecutive years. Slight fluctuations in the values of the research indicators were noted, which is why the machine breaks were additionally examined.
{"title":"ASSESSMENT OF PRODUCTION EQUIPMENT OF chosen rolling mill IN POLAND","authors":"M. Ingaldi, M. Mazur","doi":"10.37904/metal.2020.3647","DOIUrl":"https://doi.org/10.37904/metal.2020.3647","url":null,"abstract":"Appropriate maintenance of machinery and production equipment allows for smooth production, eliminates downtime related to failures, improves work safety and improves the productivity of an enterprise. Well-functioning machines allow for production of high-quality products. This is an important topic especially in enterprises of the metallurgical industry due to the specificity. They usually work in system 24/7, what is more, machines and devices are used in the most effective way possible. In addition, an important factor is the ability to produce products with appropriate quality parameters, because many of these products are used, e.g. in various machines, vehicles, constructions or buildings. The purpose of the paper was to assess the production devices of one of the rolling mills in Poland in terms of its condition and use. Chosen technical and technological indicators typical of metallurgical enterprises were used for this assessment. This research covered 5 consecutive years. Slight fluctuations in the values of the research indicators were noted, which is why the machine breaks were additionally examined.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91110109","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.2020.3516
Š. Mikmeková, O. Ambrož, Veronika Hegrová, T. Aoyama
The paper aims to demonstrate a modern scanning electron microscope (SEM) as a powerful tool for visualization of the secondary phases in TRIP steel. The TRIP steel specimens prepared by various metallographic techniques were imaged by the SEM and the secondary phases presence was confirmed by an electron back-scattered diffraction (EBSD) technique. The chemical polishing by 5 % HF in H 2 O 2 for 10 seconds results in selective etching for each individual phase, as confirmed by an atomic force microscopy (AFM) and hybrid AFM-in-SEM techniques. The phases are easily distinguishable in the SEM micrographs created by the low energy high take-off angle signal electrons. The proposed sample preparation technique together with special SEM imaging conditions enables us accurate analysis of distribution of secondary phases within the TRIP steel matrix and moreover, the retained austenite is distinguishable from the martensite phase.
{"title":"study of secondary phases in trip steel by advanced SEM and AFM Techniques","authors":"Š. Mikmeková, O. Ambrož, Veronika Hegrová, T. Aoyama","doi":"10.37904/metal.2020.3516","DOIUrl":"https://doi.org/10.37904/metal.2020.3516","url":null,"abstract":"The paper aims to demonstrate a modern scanning electron microscope (SEM) as a powerful tool for visualization of the secondary phases in TRIP steel. The TRIP steel specimens prepared by various metallographic techniques were imaged by the SEM and the secondary phases presence was confirmed by an electron back-scattered diffraction (EBSD) technique. The chemical polishing by 5 % HF in H 2 O 2 for 10 seconds results in selective etching for each individual phase, as confirmed by an atomic force microscopy (AFM) and hybrid AFM-in-SEM techniques. The phases are easily distinguishable in the SEM micrographs created by the low energy high take-off angle signal electrons. The proposed sample preparation technique together with special SEM imaging conditions enables us accurate analysis of distribution of secondary phases within the TRIP steel matrix and moreover, the retained austenite is distinguishable from the martensite phase.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90256146","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.2020.3639
Tomáš Kutáč, Josef Kutáč, E. Švecová
This article explores the options for automating the process involved in shipping metallurgical products. The shipping process usually begins with the logistics team entering a request for shipping into the information system after production is complete. The team then searches for a contracted transport company, selects the least expensive from the available options, creates an order in the system, contacts the selected company, and before commencing with shipment, enters the vehicle and driver information into the system. Under the desired solution, this entire process would be automated with a web application, with only the driver and vehicle information being entered by the transport company.
{"title":"AUTOMATION OF THE SHIPPING PROCESS OF METALLURGICAL PRODUCTS","authors":"Tomáš Kutáč, Josef Kutáč, E. Švecová","doi":"10.37904/metal.2020.3639","DOIUrl":"https://doi.org/10.37904/metal.2020.3639","url":null,"abstract":"This article explores the options for automating the process involved in shipping metallurgical products. The shipping process usually begins with the logistics team entering a request for shipping into the information system after production is complete. The team then searches for a contracted transport company, selects the least expensive from the available options, creates an order in the system, contacts the selected company, and before commencing with shipment, enters the vehicle and driver information into the system. Under the desired solution, this entire process would be automated with a web application, with only the driver and vehicle information being entered by the transport company.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82111618","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.2020.3539
A. Glanc, Š. Houdková, Z. Jansa, M. Vostřák
Superalloys with cobalt as a base material are widely used among different industry applications. Their main advantages are excellent corrosion and wear resistance. Material CoCrTaAlCSiY was chosen for this study as an unexplored representative of Co-based superalloys with a potential for good tribological behavior. This paper follows the results of previous paper called “Microstructure and Tribological Behavior of HVOF Sprayed and Laser Remelted CoCrTaAlCSiY Coatings”. In this paper are also presented three states of HVOF sprayed and post laser treated coatings of CoCrTaAlCSiY (as spray state and two different laser treatments varying in specific energy of laser). Pin-on-disc test was carried out to evaluate wear behavior. XRD analysis was done to reveal phase transformations between FCC and HCP. A positive effect on wear coefficient for both laser treated CoCrTaAlCSiY coatings was proved.
{"title":"Microstructure, Tribological Behaviour and xrd analysis of HVOF Sprayed and Laser Remelted CoCrTaAlCSiY Coatings","authors":"A. Glanc, Š. Houdková, Z. Jansa, M. Vostřák","doi":"10.37904/metal.2020.3539","DOIUrl":"https://doi.org/10.37904/metal.2020.3539","url":null,"abstract":"Superalloys with cobalt as a base material are widely used among different industry applications. Their main advantages are excellent corrosion and wear resistance. Material CoCrTaAlCSiY was chosen for this study as an unexplored representative of Co-based superalloys with a potential for good tribological behavior. This paper follows the results of previous paper called “Microstructure and Tribological Behavior of HVOF Sprayed and Laser Remelted CoCrTaAlCSiY Coatings”. In this paper are also presented three states of HVOF sprayed and post laser treated coatings of CoCrTaAlCSiY (as spray state and two different laser treatments varying in specific energy of laser). Pin-on-disc test was carried out to evaluate wear behavior. XRD analysis was done to reveal phase transformations between FCC and HCP. A positive effect on wear coefficient for both laser treated CoCrTaAlCSiY coatings was proved.","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":"81983913","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.2020.3570
P. Šulcová, M. Vostřák, J. Antoš, K. Lencová
The components of rail vehicles are strained by a number of sources, whether operational, natural, or effects caused by passengers. For protection against these influences, the number of types of surface protection is frequently used. The project called “Increasing of resistance of rail vehicles components by the means of modern thermal spraying technologies” deals with improving the performance and service life of rail vehicle components by thermal spraying. In the project, more than ten components are selected for coating by different material sprayed by different methods of thermal spraying. This paper is focused on coating made by Twin Wire Arc Spraying. Three materials of coating sprayed by TWAS were tested and their mechanical properties were evaluated in this paper. These materials are pure molybdenum, Fe13Cr, and Zn15Al. The Ball on Flat, Dry Sand/Rubber wheel Test, and Erosion Wear Resistance Test were done. The molybdenum coating showed very good sliding properties. This material can find its application for rolling components such as rollers, or rollers carriers. The Fe13Cr and Zn15Al coatings showed a very good erosion resistance. The Zn15Al had even a better erosion resistance than Fe13Cr. Both of these materials can be used, where this type of wear resistance is required, for example for walkable footplates. The Fe13Cr had also a very good abrasive resistance in contrast with Zn15Al, which can’t be recommended for application where abrasion resistance is required. The spraying of real components is also shortly presented in this paper.
{"title":"Improving performance and service life of Rail vehicles components by twin wire arc spraying","authors":"P. Šulcová, M. Vostřák, J. Antoš, K. Lencová","doi":"10.37904/metal.2020.3570","DOIUrl":"https://doi.org/10.37904/metal.2020.3570","url":null,"abstract":"The components of rail vehicles are strained by a number of sources, whether operational, natural, or effects caused by passengers. For protection against these influences, the number of types of surface protection is frequently used. The project called “Increasing of resistance of rail vehicles components by the means of modern thermal spraying technologies” deals with improving the performance and service life of rail vehicle components by thermal spraying. In the project, more than ten components are selected for coating by different material sprayed by different methods of thermal spraying. This paper is focused on coating made by Twin Wire Arc Spraying. Three materials of coating sprayed by TWAS were tested and their mechanical properties were evaluated in this paper. These materials are pure molybdenum, Fe13Cr, and Zn15Al. The Ball on Flat, Dry Sand/Rubber wheel Test, and Erosion Wear Resistance Test were done. The molybdenum coating showed very good sliding properties. This material can find its application for rolling components such as rollers, or rollers carriers. The Fe13Cr and Zn15Al coatings showed a very good erosion resistance. The Zn15Al had even a better erosion resistance than Fe13Cr. Both of these materials can be used, where this type of wear resistance is required, for example for walkable footplates. The Fe13Cr had also a very good abrasive resistance in contrast with Zn15Al, which can’t be recommended for application where abrasion resistance is required. The spraying of real components is also shortly presented in this paper.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83068545","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.2020.3630
M. Ferdyn, J. Piątkowski
In paper authors present the influence of adjusting key parameter, which is changeover point between first and second phase, on quality of casting from AlSi9Cu3(Fe) alloy. Technological tests were carried out in industrial conditions on a machine with a clamping force of 1200 Mg with variable parameters of the piston operation. Production practice has shown that with inappropriate selection of parameters, on the final products significant casting defects appear in the form of: drags, delaminations, sticking of castings on the mould and discoloration associated with uneven filling of the mould cavity. Based on the temperature distribution of the mould, the spray head was checked for correct operation and its impact on defects was eliminated. The filling of the mould was checked at the time of switching the second phase with the vacuum turned on and off in the mould cavity. It was shown that the key parameter is the appropriate selection of the changeover point of the second phase which is influenced by the vacuum in the cavity of closed mould.
{"title":"Influence of vacuum on adjusting parameters of high pressure die casting parts from alloy AlSi9Cu3(Fe)","authors":"M. Ferdyn, J. Piątkowski","doi":"10.37904/metal.2020.3630","DOIUrl":"https://doi.org/10.37904/metal.2020.3630","url":null,"abstract":"In paper authors present the influence of adjusting key parameter, which is changeover point between first and second phase, on quality of casting from AlSi9Cu3(Fe) alloy. Technological tests were carried out in industrial conditions on a machine with a clamping force of 1200 Mg with variable parameters of the piston operation. Production practice has shown that with inappropriate selection of parameters, on the final products significant casting defects appear in the form of: drags, delaminations, sticking of castings on the mould and discoloration associated with uneven filling of the mould cavity. Based on the temperature distribution of the mould, the spray head was checked for correct operation and its impact on defects was eliminated. The filling of the mould was checked at the time of switching the second phase with the vacuum turned on and off in the mould cavity. It was shown that the key parameter is the appropriate selection of the changeover point of the second phase which is influenced by the vacuum in the cavity of closed mould.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"91 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88985933","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.2020.3468
A. Rudskoi, G. Kodzhaspirov, J. Kliber
The effect of the strain accumulation by changing the number of rolling passes on the rolling force, structure and mechanical properties of austenitic Cr-Ni-Ti stainless steel with different carbon contents has been studied. An increase of the number of passes for a given overall reduction was found to have a beneficial effect on tensile properties while maintaining adequate ductility. At a rolling temperature of 1100 - 1150 °C with rolling in 1-3 passes, an increase in carbon content leads to acceleration of softening processes. With a lower rolling temperature and an increased number of passes, the reverse effect is obtained. When working out rolling schedules for sequences in HTMP conditions involving cooling before the final passes, residual hardening must be taken into account in rolling force calculations to prevent to prevent the mechanical equipment of the rolling stand from the breakage.
{"title":"EFFECT OF STRAIN ACCUMULATION UNDER HIGH TEMPERATURE THERMOMECHANICAL PROCESSING ON THE ROLLING FORCE AND MECHANICAL PROPERTIES OF AUSTENITIC STAINLESS STEEL WITH VARIOUS CARBON CONTENT","authors":"A. Rudskoi, G. Kodzhaspirov, J. Kliber","doi":"10.37904/metal.2020.3468","DOIUrl":"https://doi.org/10.37904/metal.2020.3468","url":null,"abstract":"The effect of the strain accumulation by changing the number of rolling passes on the rolling force, structure and mechanical properties of austenitic Cr-Ni-Ti stainless steel with different carbon contents has been studied. An increase of the number of passes for a given overall reduction was found to have a beneficial effect on tensile properties while maintaining adequate ductility. At a rolling temperature of 1100 - 1150 °C with rolling in 1-3 passes, an increase in carbon content leads to acceleration of softening processes. With a lower rolling temperature and an increased number of passes, the reverse effect is obtained. When working out rolling schedules for sequences in HTMP conditions involving cooling before the final passes, residual hardening must be taken into account in rolling force calculations to prevent to prevent the mechanical equipment of the rolling stand from the breakage.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89076098","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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