Pub Date : 2020-01-01DOI: 10.37904/metal.2020.3515
P. Martínek, P. Podaný
A manufacturer of crankshafts uses steel stock purchased from several vendors. The steels differ in their behaviour during the manufacture of the crankshaft, although they are the same grade. Some steel stock batches were repeatedly associated with much faster wear of grinding wheels than others. What is more, the crankshafts also suffered damage in production. As a result, the cost of production increased to unacceptable levels. Titanium precipitates were suspected to be the cause of the grinding wheels going dull. Therefore, an investigation was carried out to determine in which phases the titanium addition is present. The quantities, sizes, distributions and morphologies of particles containing titanium were measured using image analysis. Finally, the data were correlated to the method of steel production, the vendor and the titanium content.
{"title":"Image analysis of titanium carbonitrides","authors":"P. Martínek, P. Podaný","doi":"10.37904/metal.2020.3515","DOIUrl":"https://doi.org/10.37904/metal.2020.3515","url":null,"abstract":"A manufacturer of crankshafts uses steel stock purchased from several vendors. The steels differ in their behaviour during the manufacture of the crankshaft, although they are the same grade. Some steel stock batches were repeatedly associated with much faster wear of grinding wheels than others. What is more, the crankshafts also suffered damage in production. As a result, the cost of production increased to unacceptable levels. Titanium precipitates were suspected to be the cause of the grinding wheels going dull. Therefore, an investigation was carried out to determine in which phases the titanium addition is present. The quantities, sizes, distributions and morphologies of particles containing titanium were measured using image analysis. Finally, the data were correlated to the method of steel production, the vendor and the titanium content.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87404722","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.2020.3593
M. Hugo, Milan Luňák, Jana Vítková, Š. Michna
In this time many suppliers are existed with raw material for foundry and the same as a minimum number has difficult task of choosing the most suitable one. How we can search the best of them for us? It is hard question. This article shows what can be checking around the raw material. The basic test is spectral analysis, what is indispensable every foundry in this time. Chemical composition absolutely does not show an important information about properties of alloy. A little bit more tests were made for compare 2 suppliers. There were used measuring as Dichte Index, Thermal analysis and metallographic cuts as necessary evidence for proper evaluation.
{"title":"Comparing two suppliers of aluminium alloys for foundry","authors":"M. Hugo, Milan Luňák, Jana Vítková, Š. Michna","doi":"10.37904/metal.2020.3593","DOIUrl":"https://doi.org/10.37904/metal.2020.3593","url":null,"abstract":"In this time many suppliers are existed with raw material for foundry and the same as a minimum number has difficult task of choosing the most suitable one. How we can search the best of them for us? It is hard question. This article shows what can be checking around the raw material. The basic test is spectral analysis, what is indispensable every foundry in this time. Chemical composition absolutely does not show an important information about properties of alloy. A little bit more tests were made for compare 2 suppliers. There were used measuring as Dichte Index, Thermal analysis and metallographic cuts as necessary evidence for proper evaluation.","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":"91545669","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.2020.3459
T. Lipiński, Anna Wach, D. Karpisz
Non-metallic inclusions are one of the factors that influence the fatigue strength of steel. Although steel has a relatively small number of non-metallic inclusions, those impurities have a considerable impact on the material's technological and strength parameters, in particular fatigue strength and life. The study was performed on 7 heats produced in an industrial plant. Fourteen heats were produced in 140 ton electric furnaces. The experimental variants were compared in view of the applied melting technology and heat treatment options. The results were presented to account for the correlations between the fatigue strength coefficient during rotary bending, the diameter of and spacing between submicroscopic impurities. Equations for calculating the fatigue strength coefficient at each tempering temperature and a general equation for all tempering temperatures were proposed. Equations for estimating the fatigue strength coefficient based on the relative volume of submicroscopic non-metallic inclusions were also presented. The relationship between the fatigue strength and hardness of high-grade steel vs. the quotient of the diameter of impurities and the spacing between impurities were determined. The analyzed material was one grade of medium-carbon structural steel. The proposed linear regression equations supported the determination of fatigue strength coefficient and bending fatigue strength as a function of hardness taking into account impurities. The proposed equations contributes to the existing knowledge base of practices impact of impurities with various diameters and spacing between non-metalic inclusion on fatigue strength.
{"title":"Influence the NON-METALLIC INCLUSIONS on BENDING FATIGUE STRENGTH OF medium-carbon STRUCTURAL STEEL melted in an electric furnace","authors":"T. Lipiński, Anna Wach, D. Karpisz","doi":"10.37904/metal.2020.3459","DOIUrl":"https://doi.org/10.37904/metal.2020.3459","url":null,"abstract":"Non-metallic inclusions are one of the factors that influence the fatigue strength of steel. Although steel has a relatively small number of non-metallic inclusions, those impurities have a considerable impact on the material's technological and strength parameters, in particular fatigue strength and life. The study was performed on 7 heats produced in an industrial plant. Fourteen heats were produced in 140 ton electric furnaces. The experimental variants were compared in view of the applied melting technology and heat treatment options. The results were presented to account for the correlations between the fatigue strength coefficient during rotary bending, the diameter of and spacing between submicroscopic impurities. Equations for calculating the fatigue strength coefficient at each tempering temperature and a general equation for all tempering temperatures were proposed. Equations for estimating the fatigue strength coefficient based on the relative volume of submicroscopic non-metallic inclusions were also presented. The relationship between the fatigue strength and hardness of high-grade steel vs. the quotient of the diameter of impurities and the spacing between impurities were determined. The analyzed material was one grade of medium-carbon structural steel. The proposed linear regression equations supported the determination of fatigue strength coefficient and bending fatigue strength as a function of hardness taking into account impurities. The proposed equations contributes to the existing knowledge base of practices impact of impurities with various diameters and spacing between non-metalic inclusion on fatigue strength.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76632759","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.2020.3618
V. Sufiiarov, Artem Kantyukov, I. Polozov
Metal-ceramic composites are attractive materials for various applications due to their high specific strength, wear resistance, thermal stability, and good high-temperature mechanical properties. Binder jetting additive manufacturing is a promising way of manufacturing metal-ceramic composite parts with complex geometry. In this work, Al 2 O 3 - Si powder blend was used to produce metal-ceramic green-parts by binder jetting process. The green-parts were then subjected to reaction sintering and subsequent liquid metal infiltration with aluminum alloy at 1200 ºC. The microstructure and phase composition of the obtained samples were studied using scanning electron microscopy and X-Ray diffraction analysis. Mechanical properties were evaluated using microhardness measurements and compressive tests.
{"title":"Reaction sintering of metal-ceramic AlSi-Al2O3 composites manufactured by binder jetting additive manufacturing process","authors":"V. Sufiiarov, Artem Kantyukov, I. Polozov","doi":"10.37904/metal.2020.3618","DOIUrl":"https://doi.org/10.37904/metal.2020.3618","url":null,"abstract":"Metal-ceramic composites are attractive materials for various applications due to their high specific strength, wear resistance, thermal stability, and good high-temperature mechanical properties. Binder jetting additive manufacturing is a promising way of manufacturing metal-ceramic composite parts with complex geometry. In this work, Al 2 O 3 - Si powder blend was used to produce metal-ceramic green-parts by binder jetting process. The green-parts were then subjected to reaction sintering and subsequent liquid metal infiltration with aluminum alloy at 1200 ºC. The microstructure and phase composition of the obtained samples were studied using scanning electron microscopy and X-Ray diffraction analysis. Mechanical properties were evaluated using microhardness measurements and compressive tests.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"10 9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83575747","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.2020.3632
M. Kalenga, J. Ntuli
South Africa is amongst the influential producers of gold worldwide. Many results have been published on its ores and different parameters defined. Although the carbon-in-pulp (CIP) and carbon-in-leach (CIL) have been largely investigated, optimum parameters change with the chemical composition of the ore based on the geological origins. The ore used in the present work was silica-rich quartzite conglomerates containing a layer of pyrite. The optimization of the gold recovery from the ore used and the better processing route between CIP and CIL were investigated and adopted. Alternating variations were conducted and most suitable leaching parameters were identified. Mineralogical test work conducted in the present investigation led to a better understanding of the ore mineralogy and assisted efficiently in resolving the reasons of impeding cyanidation with this ore. Also, the mineralogical results were compared with the ore, which is treated conventionally and identification of the problematic minerals was possible. XRD, XRF and AAS were used for characterization.
{"title":"Comparison of the Leachability of a silica-rich quartzite conglomerates containing a layer of pyrite Using CIP and CIL","authors":"M. Kalenga, J. Ntuli","doi":"10.37904/metal.2020.3632","DOIUrl":"https://doi.org/10.37904/metal.2020.3632","url":null,"abstract":"South Africa is amongst the influential producers of gold worldwide. Many results have been published on its ores and different parameters defined. Although the carbon-in-pulp (CIP) and carbon-in-leach (CIL) have been largely investigated, optimum parameters change with the chemical composition of the ore based on the geological origins. The ore used in the present work was silica-rich quartzite conglomerates containing a layer of pyrite. The optimization of the gold recovery from the ore used and the better processing route between CIP and CIL were investigated and adopted. Alternating variations were conducted and most suitable leaching parameters were identified. Mineralogical test work conducted in the present investigation led to a better understanding of the ore mineralogy and assisted efficiently in resolving the reasons of impeding cyanidation with this ore. Also, the mineralogical results were compared with the ore, which is treated conventionally and identification of the problematic minerals was possible. XRD, XRF and AAS were used for characterization.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82471994","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.2020.3553
Š. Msallamová, M. Kouřil, F. Mícek, Kateryna Popova, Jessika Yerbe
A lead was used in the past in a variety of applications for example for roofs of churches, garden ornaments, lead seals, and organ pipes. Lead alloys are susceptible to a corrosion attack in an environment containing volatile organic compounds especially acetic acid vapors. The source of acetic acid vapors is mainly wood, glued joints, some varnishes, plastics, and paints. In the acetic acid vapors environment, the corrosion rate of Pb alloys rapidly increases. The study of protective properties of acrylic coatings of lead (Paraloid 72, B48N a B44) in an environment containing acetic acid vapors was the aim of this work. The acrylic coatings were prepared with or without 1,2,3, - Benzotriazole (BTA). Painted lead samples were exposed in an environment containing acetic acid vapors for 8 weeks. The color change of lead surfaces was observed by a spectrophotometer during the exposition. The preservation effect of acrylic coatings were evaluated by the mass gain of lead samples during the exposition. The surface of the lead samples after exposition was observed by optical microscopy, and X-ray diffraction analysis. The research proved that the Paraloid B44 with BTA has the best protective properties of lead in an environment containing acetic acid vapors from all tested coatings.
{"title":"Protection of lead by preservation acrylic coatings in acetic vapors environment","authors":"Š. Msallamová, M. Kouřil, F. Mícek, Kateryna Popova, Jessika Yerbe","doi":"10.37904/metal.2020.3553","DOIUrl":"https://doi.org/10.37904/metal.2020.3553","url":null,"abstract":"A lead was used in the past in a variety of applications for example for roofs of churches, garden ornaments, lead seals, and organ pipes. Lead alloys are susceptible to a corrosion attack in an environment containing volatile organic compounds especially acetic acid vapors. The source of acetic acid vapors is mainly wood, glued joints, some varnishes, plastics, and paints. In the acetic acid vapors environment, the corrosion rate of Pb alloys rapidly increases. The study of protective properties of acrylic coatings of lead (Paraloid 72, B48N a B44) in an environment containing acetic acid vapors was the aim of this work. The acrylic coatings were prepared with or without 1,2,3, - Benzotriazole (BTA). Painted lead samples were exposed in an environment containing acetic acid vapors for 8 weeks. The color change of lead surfaces was observed by a spectrophotometer during the exposition. The preservation effect of acrylic coatings were evaluated by the mass gain of lead samples during the exposition. The surface of the lead samples after exposition was observed by optical microscopy, and X-ray diffraction analysis. The research proved that the Paraloid B44 with BTA has the best protective properties of lead in an environment containing acetic acid vapors from all tested coatings.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88796390","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.2020.3538
V. Boldyrev, V. Men’Shikov, F. Il’Darkhanova, V. Puchkova, Daria Strapolova
The specific feature of modern Russian paintwork material (PWM) market is an import share rise along with foreign manufactures extensive expansion. Russian market range of PWM contents above 3000 items, considering both PWM being used in household and foreign products. Import products are 25-30% of Russian PWM market volume. High level of rivalry, marketing battle between foreign and domestic manufactures is common for it. Major PWM exporting countries in Russia are: German (14% of total amount), Finland (11%), Belarus (9,7%), Estonian (9%), USA(8,9%), Korea (7,5%), Lithuania (7%). According to «Symbol Marketing» agency data, Tikkurila (Finland), AkzoNobel (Sweden), Meffest AG (German), PPG-Helios (Italy-Slovenia), BASF (German), Jobi (German), Teknos (Finland), Marshall (Turkey), DuPont (USA) lead among the manufacturing companies exporting their PWM in Russia. The main domestic PWM competitiveness rise condition is establishment of common quality, endurance, ecological safety and evaluating methods standards accepted as in Russia so in other countries. This scientific research made for PWM manufacturers and consumers solves International Organization for Standardization (ISO) and Russian National Standart (GOST) interaction problem in order to standardize Russian PWM output and increase its competitiveness at the international market.
{"title":"Harmonization of technical demands to paint coatings as a component of competitiveness increase on the international market","authors":"V. Boldyrev, V. Men’Shikov, F. Il’Darkhanova, V. Puchkova, Daria Strapolova","doi":"10.37904/metal.2020.3538","DOIUrl":"https://doi.org/10.37904/metal.2020.3538","url":null,"abstract":"The specific feature of modern Russian paintwork material (PWM) market is an import share rise along with foreign manufactures extensive expansion. Russian market range of PWM contents above 3000 items, considering both PWM being used in household and foreign products. Import products are 25-30% of Russian PWM market volume. High level of rivalry, marketing battle between foreign and domestic manufactures is common for it. Major PWM exporting countries in Russia are: German (14% of total amount), Finland (11%), Belarus (9,7%), Estonian (9%), USA(8,9%), Korea (7,5%), Lithuania (7%). According to «Symbol Marketing» agency data, Tikkurila (Finland), AkzoNobel (Sweden), Meffest AG (German), PPG-Helios (Italy-Slovenia), BASF (German), Jobi (German), Teknos (Finland), Marshall (Turkey), DuPont (USA) lead among the manufacturing companies exporting their PWM in Russia. The main domestic PWM competitiveness rise condition is establishment of common quality, endurance, ecological safety and evaluating methods standards accepted as in Russia so in other countries. This scientific research made for PWM manufacturers and consumers solves International Organization for Standardization (ISO) and Russian National Standart (GOST) interaction problem in order to standardize Russian PWM output and increase its competitiveness at the international market.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"205 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81504219","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.2020.3509
A. Dudek, Jerzy Cugowski
The combustion of fuels plays an important role in the field of industry and power engineering. Circulating fluidized bed combustion (CFBC) is a clean technology and also it is a convenient method of energy production from a wide range of fuels. The present paper reports the results of the authors' investigation focused on the analysis of heat resistant steel samples from one of the Polish circulating fluidized bed boilers. The anchors were degraded during boiler operation and lost their mechanical durability. To determine the reasons for anchors degradation the materials were subjected to microstructural analysis using a light microscope, scanning microscopy Joel JSM 5400 equipped with EDS. In the case of the investigated anchor samples, the formation of a large number of hard and chromium-rich intrusions was determined. The reason for material problems as incorrect positioning of the anchors in the refractory material was determined.
{"title":"Failure analysis of anchoring system of a Circulating Fluidized Bed Boiler","authors":"A. Dudek, Jerzy Cugowski","doi":"10.37904/metal.2020.3509","DOIUrl":"https://doi.org/10.37904/metal.2020.3509","url":null,"abstract":"The combustion of fuels plays an important role in the field of industry and power engineering. Circulating fluidized bed combustion (CFBC) is a clean technology and also it is a convenient method of energy production from a wide range of fuels. The present paper reports the results of the authors' investigation focused on the analysis of heat resistant steel samples from one of the Polish circulating fluidized bed boilers. The anchors were degraded during boiler operation and lost their mechanical durability. To determine the reasons for anchors degradation the materials were subjected to microstructural analysis using a light microscope, scanning microscopy Joel JSM 5400 equipped with EDS. In the case of the investigated anchor samples, the formation of a large number of hard and chromium-rich intrusions was determined. The reason for material problems as incorrect positioning of the anchors in the refractory material was determined.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"1 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72634822","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.2020.3520
M. Šmátralová, P. Čížek, L. Kander
The National Action Plan for the Development of Nuclear Energy in the Czech Republic envisages the preparation for the construction of two new blocks of the nuclear power plant in the location of Dukovany and the location of Temelín. Although the final supplier of these units is not clear yet, there are good prospects that some components could be produced by the local producers. The paper presents the principal results of development and verification of production technology of weld joints of pressure vessels components for primary circuits of the nuclear power plants of MIR 1200 type. Attention was focused to the influence of welding technology SAW and SMAW including post weld heat treatment on the final mechanical and fracture properties of welded joints of large forgings. Homogeneous weld joints were made of 10GN2MFA low-alloy steel while heterogeneous weldment was prepared from 10GN2MFA and 08CH18N10T stainless steel. The welded joints were subjected to a comprehensive evaluation of the material properties, especially the evaluation of macro and microstructure, tensile test and impact bending test as well as unconventional mechanical properties such as initial value of the J-integral, the stress intensity factor and low cycle fatigue limit. The effect of welding technology on the transition temperature (Tk0) of the weld joint was evaluated, too.
{"title":"COMPLEX EVALUATION OF STRUCTURE AND MATERIAL PROPERTIES OF SELECTED WELDING JOINTS","authors":"M. Šmátralová, P. Čížek, L. Kander","doi":"10.37904/metal.2020.3520","DOIUrl":"https://doi.org/10.37904/metal.2020.3520","url":null,"abstract":"The National Action Plan for the Development of Nuclear Energy in the Czech Republic envisages the preparation for the construction of two new blocks of the nuclear power plant in the location of Dukovany and the location of Temelín. Although the final supplier of these units is not clear yet, there are good prospects that some components could be produced by the local producers. The paper presents the principal results of development and verification of production technology of weld joints of pressure vessels components for primary circuits of the nuclear power plants of MIR 1200 type. Attention was focused to the influence of welding technology SAW and SMAW including post weld heat treatment on the final mechanical and fracture properties of welded joints of large forgings. Homogeneous weld joints were made of 10GN2MFA low-alloy steel while heterogeneous weldment was prepared from 10GN2MFA and 08CH18N10T stainless steel. The welded joints were subjected to a comprehensive evaluation of the material properties, especially the evaluation of macro and microstructure, tensile test and impact bending test as well as unconventional mechanical properties such as initial value of the J-integral, the stress intensity factor and low cycle fatigue limit. The effect of welding technology on the transition temperature (Tk0) of the weld joint was evaluated, too.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73137450","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.2020.3619
M. Węglowski, S. Błacha, K. Kwieciński, P. Śliwiński, J. Dutkiewicz, Ł. Rogal
Shape memory alloys (such as Ni-Ti) are a unique class of active materials, which can recover to their original shape after applying stimuli, such as deformation due to stress, heat or magnetic field. These alloys possess attractive characteristics such as ability to provide large recoverable strain during mechanical loading (pseudoelasticity), shape recovery upon heating (shape memory effect), and potent biocompatibility, which make alloys one of the suitable actuators for biomedical applications. In the present paper the results of microstructure, martensitic transformation behaviour and superelastic properties of Ni-Ti alloys fabricated using a EBAM technique, which applies wire as the additive material were presented. It was revealed that the microstructure of the deposit exhibited typical solidification features of columnar grains of austenite, due to epitaxial growth mechanism. Moreover, EBSD investigations revealed that the preferential grain orientation in [001] is a result of the adopted material layer deposition. TEM studies have shown presence of martensitic needles partially twinned within austenitic matrix, and a low dislocation density within austenite confirming ability of the EBAM manufactured sample to pseudoelastic deformation at room temperature.
{"title":"electron beam additive manufacturing of Ni-Ti alloy","authors":"M. Węglowski, S. Błacha, K. Kwieciński, P. Śliwiński, J. Dutkiewicz, Ł. Rogal","doi":"10.37904/metal.2020.3619","DOIUrl":"https://doi.org/10.37904/metal.2020.3619","url":null,"abstract":"Shape memory alloys (such as Ni-Ti) are a unique class of active materials, which can recover to their original shape after applying stimuli, such as deformation due to stress, heat or magnetic field. These alloys possess attractive characteristics such as ability to provide large recoverable strain during mechanical loading (pseudoelasticity), shape recovery upon heating (shape memory effect), and potent biocompatibility, which make alloys one of the suitable actuators for biomedical applications. In the present paper the results of microstructure, martensitic transformation behaviour and superelastic properties of Ni-Ti alloys fabricated using a EBAM technique, which applies wire as the additive material were presented. It was revealed that the microstructure of the deposit exhibited typical solidification features of columnar grains of austenite, due to epitaxial growth mechanism. Moreover, EBSD investigations revealed that the preferential grain orientation in [001] is a result of the adopted material layer deposition. TEM studies have shown presence of martensitic needles partially twinned within austenitic matrix, and a low dislocation density within austenite confirming ability of the EBAM manufactured sample to pseudoelastic deformation at room temperature.","PeriodicalId":18449,"journal":{"name":"METAL 2020 Conference Proeedings","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73709952","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：