Pub Date : 2020-01-01DOI: 10.37904/metal.2020.3501
J. Moravec, Jan Novák, J. Sobotka, I. Nováková
Structural designs of the dynamically loaded welded structures are currently based primarily on the values of the parent base material fatigue life. Although it tries to capture the influence of the given process by using the safety constants of the notch effect both of the weld and the thermal influence, it is only a theoretical estimation. Due to that, it very often results in large oversizing and, in worse cases, in under-sizing of the engineering design. As a result, there is either an overly robust and heavy construction, which is unacceptable (especially when applied in the automotive industry) or on the contrary, there is failure of parts due to cracks earlier than their planned service life is reached. The paper shows the effect of MAG welding method on the fatigue life of fillet and butt welds made of the fine-grained structural steel S460MC. The comparison of such influence is performed via using experimentally determined Wöhler curves of the parent material and both types of welded joints.
{"title":"Influence of the Welding Process on Changes in the S460MC Fine-grained Steel Joints Fatigue life","authors":"J. Moravec, Jan Novák, J. Sobotka, I. Nováková","doi":"10.37904/metal.2020.3501","DOIUrl":"https://doi.org/10.37904/metal.2020.3501","url":null,"abstract":"Structural designs of the dynamically loaded welded structures are currently based primarily on the values of the parent base material fatigue life. Although it tries to capture the influence of the given process by using the safety constants of the notch effect both of the weld and the thermal influence, it is only a theoretical estimation. Due to that, it very often results in large oversizing and, in worse cases, in under-sizing of the engineering design. As a result, there is either an overly robust and heavy construction, which is unacceptable (especially when applied in the automotive industry) or on the contrary, there is failure of parts due to cracks earlier than their planned service life is reached. The paper shows the effect of MAG welding method on the fatigue life of fillet and butt welds made of the fine-grained structural steel S460MC. The comparison of such influence is performed via using experimentally determined Wöhler curves of the parent material and both types of welded joints.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87604210","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.2020.3601
V. Kodetová, M. Vlach, M. Leibner, H. Kudrnová, P. Harcuba, L. Bajtošová, M. Cieslar
In the present work AA7075 alloys with and without Sc, Zr addition after hot deformation were studied. Thermal responses of precipitation reactions of hot deformed alloys were studied by differential scanning calorimetry, the relative electrical resistivity changes were determined by DC four-point method. The interconnections of these two materials characteristics were presented. Thermal and electrical measurements were compared to microstructure development that was observed by scanning and transmission electron microscope. Two types of eutectic phase were proved at (sub)grain boundaries. In the AA7075-Sc,Zr alloy primary multilayer Al3(Sc,Zr) particles precipitated during casting and subsequent cooling. In the thermal curves one exothermic process at ~ 200 °C and the decrease of relative resistivity changes were observed. Apparent activation energy of this process was calculated using by Kissinger method as ~ 100 kJ/mol regardless Sc, Zr addition. Schematic timetemperature-transformation diagram of the exothermic process was done on the base of calorimetric measurements at different heating rates.
{"title":"THERMAL CHARACTERISTICS AND ELECTRICAL PROPERTIES OF HOT DEFORMED AA7075 ALLOYS WITH AND WITHOUT Sc, Zr ADDITIONS","authors":"V. Kodetová, M. Vlach, M. Leibner, H. Kudrnová, P. Harcuba, L. Bajtošová, M. Cieslar","doi":"10.37904/metal.2020.3601","DOIUrl":"https://doi.org/10.37904/metal.2020.3601","url":null,"abstract":"In the present work AA7075 alloys with and without Sc, Zr addition after hot deformation were studied. Thermal responses of precipitation reactions of hot deformed alloys were studied by differential scanning calorimetry, the relative electrical resistivity changes were determined by DC four-point method. The interconnections of these two materials characteristics were presented. Thermal and electrical measurements were compared to microstructure development that was observed by scanning and transmission electron microscope. Two types of eutectic phase were proved at (sub)grain boundaries. In the AA7075-Sc,Zr alloy primary multilayer Al3(Sc,Zr) particles precipitated during casting and subsequent cooling. In the thermal curves one exothermic process at ~ 200 °C and the decrease of relative resistivity changes were observed. Apparent activation energy of this process was calculated using by Kissinger method as ~ 100 kJ/mol regardless Sc, Zr addition. Schematic timetemperature-transformation diagram of the exothermic process was done on the base of calorimetric measurements at different heating rates.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"101 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79568092","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.2020.3643
R. Lenort, F. Zapletal, P. Wicher, N. Shmeleva
Sustainable development goals (SDGs) adopted by all United Nations Member States in 2015 provide an opportunity for the metallurgical and mining industry to create value for both their business and society. The aim of the paper is to analyze the SDGs preferences in the metallurgical and mining industry and identify those SDGs that companies from that industry promised to follow. The multi-criteria decision-making method PROMETHEE and the GAIA plane were used as the methodological base for analysis of input data from United Nations Global Compact database. The results show main differences in declared SDGs preferences among Europe, America, Asia, and Africa.
{"title":"Sustainability Development Goals Preferences in Metallurgical and Mining Industry","authors":"R. Lenort, F. Zapletal, P. Wicher, N. Shmeleva","doi":"10.37904/metal.2020.3643","DOIUrl":"https://doi.org/10.37904/metal.2020.3643","url":null,"abstract":"Sustainable development goals (SDGs) adopted by all United Nations Member States in 2015 provide an opportunity for the metallurgical and mining industry to create value for both their business and society. The aim of the paper is to analyze the SDGs preferences in the metallurgical and mining industry and identify those SDGs that companies from that industry promised to follow. The multi-criteria decision-making method PROMETHEE and the GAIA plane were used as the methodological base for analysis of input data from United Nations Global Compact database. The results show main differences in declared SDGs preferences among Europe, America, Asia, and Africa.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83892824","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.2020.3653
E. Kardas
Blast furnace process is the basic process of pig iron production. This kind of device has a very large volume, so every day it produces significant quantities of the products. Therefore, the effectiveness of this device should be tested regularly. It helps to find causes lowering the effectiveness and optimize the production process. The main goal of the paper is the presentation of results of Overall Equipment Effectiveness of blast furnace conducted in one of Polish steelworks and the causes lowering the value of effectiveness. The analysis covers the period of one calendar year.
{"title":"THE application of the OEE method for THE assessment OF BLAST FURNACE EFFECTIVENESS","authors":"E. Kardas","doi":"10.37904/metal.2020.3653","DOIUrl":"https://doi.org/10.37904/metal.2020.3653","url":null,"abstract":"Blast furnace process is the basic process of pig iron production. This kind of device has a very large volume, so every day it produces significant quantities of the products. Therefore, the effectiveness of this device should be tested regularly. It helps to find causes lowering the effectiveness and optimize the production process. The main goal of the paper is the presentation of results of Overall Equipment Effectiveness of blast furnace conducted in one of Polish steelworks and the causes lowering the value of effectiveness. The analysis covers the period of one calendar year.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83906059","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.2020.3582
J. Cais, Klara Caisova
Silumins (Al-Si alloys) are the most used type of aluminum foundry alloys used in the automotive. Their significant expansion is result of unique properties combination. The requirements of current automotive industry bring demands for high mechanical properties of silumins (mostly by high temperature processes, which decrease properties of aluminum alloys). One area of application where silumins replace the Fe based alloys are forms for tires pressing. Working temperature during this casting process is 160-180 °C, but nowadays trends for rubber vulcanization in tires production increase working temperature over 200 °C. Ordinary aluminum alloys lose their mechanical properties at this temperature. The article describes results of research of newly developed alloy applied for tire pressing forms. This research was subsequently widened by heat treatment being applied to this alloy. Both of these material characteristics (chemical composition and heat treatment) preserve its mechanical properties even when being exposed to high temperature processes.
{"title":"newly developed Al-Si based alloy for high temperature processes in automotive","authors":"J. Cais, Klara Caisova","doi":"10.37904/metal.2020.3582","DOIUrl":"https://doi.org/10.37904/metal.2020.3582","url":null,"abstract":"Silumins (Al-Si alloys) are the most used type of aluminum foundry alloys used in the automotive. Their significant expansion is result of unique properties combination. The requirements of current automotive industry bring demands for high mechanical properties of silumins (mostly by high temperature processes, which decrease properties of aluminum alloys). One area of application where silumins replace the Fe based alloys are forms for tires pressing. Working temperature during this casting process is 160-180 °C, but nowadays trends for rubber vulcanization in tires production increase working temperature over 200 °C. Ordinary aluminum alloys lose their mechanical properties at this temperature. The article describes results of research of newly developed alloy applied for tire pressing forms. This research was subsequently widened by heat treatment being applied to this alloy. Both of these material characteristics (chemical composition and heat treatment) preserve its mechanical properties even when being exposed to high temperature processes.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88738698","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}
G. Kasirajan, Sathish Rengarajan, R. A. Kumar, Raghav G R, V. S. Rao, K. Nagarajan
To improve the performance and effectiveness of cost, constructing lightweight structure is the important factor for automobile, naval and aerospace industries. AA5052 and AA6101-T6 aluminium alloys are widely applied in transport industries, due to their lightweight and high strength and hence, joining of these two are unavoidable. Friction stir welding is an unconventional welding method, which is developed for constructing lightweight structures. This work describes the detailed study of friction stir welded dissimilar AA5052 and AA6101-T6 alloys. AA5052 and AA6101-T6 plates are welded with rotation rates of 765–1400 rpm and offset distances at advancing side of 0–2 mm. For this purpose, four levels of welding parameters based on Taguchi L16 orthogonal array are chosen. To determine the optimum combinational levels and identify the effect of above-mentioned parameters on tensile and wear properties, Signal to Noise ratio and ANOVA respectively are used. From the results, it is observed that the combination of 1 mm offset distance at advancing side and 1400 rpm rotating speed produces better tensile and wear properties, which is due to high heat generation, sufficient flow of materials and balanced precipitation and strain hardening effects. On the other hand, the combination of 2 mm tool offset at advancing side and 765 rpm rotational rate exhibits poor properties, which is associated with low heat input, defects formation, precipitate coarsening and lesser strain hardening effects.
{"title":"Tensile and wear behaviour of friction stir welded AA5052 and AA6101-T6 aluminium alloys: effect of welding parameters","authors":"G. Kasirajan, Sathish Rengarajan, R. A. Kumar, Raghav G R, V. S. Rao, K. Nagarajan","doi":"10.1051/metal/2020039","DOIUrl":"https://doi.org/10.1051/metal/2020039","url":null,"abstract":"To improve the performance and effectiveness of cost, constructing lightweight structure is the important factor for automobile, naval and aerospace industries. AA5052 and AA6101-T6 aluminium alloys are widely applied in transport industries, due to their lightweight and high strength and hence, joining of these two are unavoidable. Friction stir welding is an unconventional welding method, which is developed for constructing lightweight structures. This work describes the detailed study of friction stir welded dissimilar AA5052 and AA6101-T6 alloys. AA5052 and AA6101-T6 plates are welded with rotation rates of 765–1400 rpm and offset distances at advancing side of 0–2 mm. For this purpose, four levels of welding parameters based on Taguchi L16 orthogonal array are chosen. To determine the optimum combinational levels and identify the effect of above-mentioned parameters on tensile and wear properties, Signal to Noise ratio and ANOVA respectively are used. From the results, it is observed that the combination of 1 mm offset distance at advancing side and 1400 rpm rotating speed produces better tensile and wear properties, which is due to high heat generation, sufficient flow of materials and balanced precipitation and strain hardening effects. On the other hand, the combination of 2 mm tool offset at advancing side and 765 rpm rotational rate exhibits poor properties, which is associated with low heat input, defects formation, precipitate coarsening and lesser strain hardening effects.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"130 1","pages":"405"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73131068","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.2020.3485
A. Arbuz, A. Kawałek, K. Ozhmegov, N. Daniyeva, E. Panin
{"title":"OBTAINING OF UFG STRUCTURE OF Zr-1% Nb ALLOY BY RADIAL-SHEAR ROLLING","authors":"A. Arbuz, A. Kawałek, K. Ozhmegov, N. Daniyeva, E. Panin","doi":"10.37904/metal.2020.3485","DOIUrl":"https://doi.org/10.37904/metal.2020.3485","url":null,"abstract":"","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"126 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74483915","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.2020.3638
T. Němec, Václav Nétek, M. Mynář, Nikola Němcová, Iveta Kuchtíčková
The authors of the article generalize the results of research of a selected group of Czech industrial companies. These companies are founded on the experience of technological transformation in industry as a prerequisite for admission to technological chains which demonstrate high measurement accuracy and major changes in technological procedures. The models of internal economic management are not sufficiently flexible to capture these changes as the investments in Industry 4.0 technologies are introduced. The results of investment research showed that the software used to manage the economics of the companies has lost its effectivity and needs replacement. One method of securing flexibility and continuity with Industry 4.0 dynamics is the application of economic thought in economics.
{"title":"SELECTED ASPECTS OF TECHNOLOGICAL THOUGHT IN ECONOMICS ACCORDING TO THE CONDITIONS OF INDUSTRY 4.0","authors":"T. Němec, Václav Nétek, M. Mynář, Nikola Němcová, Iveta Kuchtíčková","doi":"10.37904/metal.2020.3638","DOIUrl":"https://doi.org/10.37904/metal.2020.3638","url":null,"abstract":"The authors of the article generalize the results of research of a selected group of Czech industrial companies. These companies are founded on the experience of technological transformation in industry as a prerequisite for admission to technological chains which demonstrate high measurement accuracy and major changes in technological procedures. The models of internal economic management are not sufficiently flexible to capture these changes as the investments in Industry 4.0 technologies are introduced. The results of investment research showed that the software used to manage the economics of the companies has lost its effectivity and needs replacement. One method of securing flexibility and continuity with Industry 4.0 dynamics is the application of economic thought in economics.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75588409","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}
R. A. Kumar, R. Muneeswaran, M. Mohan, Sathish Rengarajan, Raghav G R, K. Nagarajan
In Friction Stir Welding (FSW) technique, hard rotating tool with specially profiled pin is plunged into base metals and traversed along the interface of the plates, generating the frictional heat and plasticizing the base metals. This leads to flow of materials and makes solid state joint. AA6101-T6 and AA1350 alloys are widely applied in electrical bus bars, because of their high electrical conductivity. In this present work, these two alloys are joined by varying the pin profile of the tools as circular, triangular, square and hexagonal. Of these four joints, the joint fabricated by circular pin profiled tool exhibits poor tensile and wear properties whereas hexagonal pin profiled tool exhibits better tensile and wear properties. This is due to the volume defects and grain refinement at stirred zone.
{"title":"Effects of tool pin profile on tensile and wear behaviour of friction stir welded AA6101-T6 and AA1350 alloys","authors":"R. A. Kumar, R. Muneeswaran, M. Mohan, Sathish Rengarajan, Raghav G R, K. Nagarajan","doi":"10.1051/metal/2020045","DOIUrl":"https://doi.org/10.1051/metal/2020045","url":null,"abstract":"In Friction Stir Welding (FSW) technique, hard rotating tool with specially profiled pin is plunged into base metals and traversed along the interface of the plates, generating the frictional heat and plasticizing the base metals. This leads to flow of materials and makes solid state joint. AA6101-T6 and AA1350 alloys are widely applied in electrical bus bars, because of their high electrical conductivity. In this present work, these two alloys are joined by varying the pin profile of the tools as circular, triangular, square and hexagonal. Of these four joints, the joint fabricated by circular pin profiled tool exhibits poor tensile and wear properties whereas hexagonal pin profiled tool exhibits better tensile and wear properties. This is due to the volume defects and grain refinement at stirred zone.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"136 1","pages":"503"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77474179","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.2020.3536
J. Ludvík, T. Lovaši, Zuzana Žofková, M. Kouřil
{"title":"Tantalum-based coatings on stainless steel for fuel-cell bipolar plates","authors":"J. Ludvík, T. Lovaši, Zuzana Žofková, M. Kouřil","doi":"10.37904/metal.2020.3536","DOIUrl":"https://doi.org/10.37904/metal.2020.3536","url":null,"abstract":"","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87438315","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：