Minmin Sun, Jianliang Zhang, Minghao Li, W. Xiong, Kejiang Li, Hongtao Li
As a revolutionary material with optical, electrical and mechanical properties, graphene has high production costs in terms of materials science, micro-nano processing, energy, biomedicine and drug delivery. To explore the low-cost materials for the synthesis of carbon nanomaterials, a method for the affordable and facile fabrication by metallurgical coke fine was demonstrated. The demineralized coke ultrafine powder (< 10 µm) was oxidized, and then treated with a combination of thermal exfoliation and solvent exfoliation. The resulting carbon powder were characterized with microscopic morphology, the defects and type of carbon and the carbon structural order by Transmission Electron Microscopy (TEM), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Photoemission Spectroscopy (XPS), Raman Spectroscopy and X-ray Diffraction (XRD). The graphene prepared by chemical-physical routine with demineralized metallurgical coke superfine powder exhibits similar characteristics to those prepared by graphite traditionally, which provides an economical and environmentally friendly method for the preparation of graphene materials.
{"title":"Preliminary study on the preparation of graphene from coke with a combined chemical and physical routine","authors":"Minmin Sun, Jianliang Zhang, Minghao Li, W. Xiong, Kejiang Li, Hongtao Li","doi":"10.1051/metal/2020060","DOIUrl":"https://doi.org/10.1051/metal/2020060","url":null,"abstract":"As a revolutionary material with optical, electrical and mechanical properties, graphene has high production costs in terms of materials science, micro-nano processing, energy, biomedicine and drug delivery. To explore the low-cost materials for the synthesis of carbon nanomaterials, a method for the affordable and facile fabrication by metallurgical coke fine was demonstrated. The demineralized coke ultrafine powder (< 10 µm) was oxidized, and then treated with a combination of thermal exfoliation and solvent exfoliation. The resulting carbon powder were characterized with microscopic morphology, the defects and type of carbon and the carbon structural order by Transmission Electron Microscopy (TEM), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Photoemission Spectroscopy (XPS), Raman Spectroscopy and X-ray Diffraction (XRD). The graphene prepared by chemical-physical routine with demineralized metallurgical coke superfine powder exhibits similar characteristics to those prepared by graphite traditionally, which provides an economical and environmentally friendly method for the preparation of graphene materials.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"23 1","pages":"605"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78782458","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}
Shrenivas S. Ashrit, S. Sarkar, Rashmi Singh, Sundeep Z. Yadav, Ravikrishna V. Chatti
The blast furnace flue dust has potential reuse application in iron making process via the sinter making route mainly due to its high carbon content. The specific aim of this study was to use different analytical techniques like chemical analysis, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and petrography to identify the different phases present in the blast furnace flue dust of Tata Steel Limited, Jamshedpur and discuss on possible use of suitable separation techniques for economic utilization of flue dust and put those separated fractions for the innovative industrial applications.
{"title":"Characterization of blast furnace flue dust – a multi analytical techniques approach","authors":"Shrenivas S. Ashrit, S. Sarkar, Rashmi Singh, Sundeep Z. Yadav, Ravikrishna V. Chatti","doi":"10.1051/metal/2020059","DOIUrl":"https://doi.org/10.1051/metal/2020059","url":null,"abstract":"The blast furnace flue dust has potential reuse application in iron making process via the sinter making route mainly due to its high carbon content. The specific aim of this study was to use different analytical techniques like chemical analysis, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and petrography to identify the different phases present in the blast furnace flue dust of Tata Steel Limited, Jamshedpur and discuss on possible use of suitable separation techniques for economic utilization of flue dust and put those separated fractions for the innovative industrial applications.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"176 1","pages":"606"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85431577","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.2020.3642
Z. Franěk, R. Pyszko
In the paper there are summarized basic analytical and empirical pieces of knowledge on searching dependences of the influence of thermal process during steel casting in the continuous casting of semi-finished products – slabs, on their quality assessment and as well the influence of thermal processes on the quality of final products rolled of slabs. The course of thermal processes at continuous steel casting has the significant impact on the quality of slabs. The assessment of the quality of slabs during continuous steel casting is an inseparable part of the information system of a metallurgical plant. This assessment works on the data collection and storing the necessary data for an effective assessment between measured and qualitative quantities. The paper describes the proposal of the concept of quality slab prediction. There are statistical methods used for this purpose, especially association rules and logistic regression. On the basis of use of the system for monitoring the casting parameters and the application of statistical methods, association rules for prediction of quality of continuously cast slabs were determined.
{"title":"LOGIT MODEL AND PREDICTION QUALITY OF CONTINUOUSLY CAST SLABS","authors":"Z. Franěk, R. Pyszko","doi":"10.37904/metal.2020.3642","DOIUrl":"https://doi.org/10.37904/metal.2020.3642","url":null,"abstract":"In the paper there are summarized basic analytical and empirical pieces of knowledge on searching dependences of the influence of thermal process during steel casting in the continuous casting of semi-finished products – slabs, on their quality assessment and as well the influence of thermal processes on the quality of final products rolled of slabs. The course of thermal processes at continuous steel casting has the significant impact on the quality of slabs. The assessment of the quality of slabs during continuous steel casting is an inseparable part of the information system of a metallurgical plant. This assessment works on the data collection and storing the necessary data for an effective assessment between measured and qualitative quantities. The paper describes the proposal of the concept of quality slab prediction. There are statistical methods used for this purpose, especially association rules and logistic regression. On the basis of use of the system for monitoring the casting parameters and the application of statistical methods, association rules for prediction of quality of continuously cast slabs were determined.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","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":"87445163","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.2020.3500
Yu. A. Belokon’, A. Yavtushenko, V. Protsenko, Y. Bondarenko, A. Cheilytko
The problem of selecting a material with an extreme value of its performance using its anisotropy is considered. It is important for specialists of metallurgical profile to be able not only to select the material for realization of the set engineering task, but also to use its anisotropy, and to be able to determine the orientation of the material with the extreme value of its performance. Mathematical modeling and computer analysis of anisotropy of tensor coefficients using the example of thermal expansion coefficient have been performed. Since thermal expansion, like any tensor physical property of crystals, is a continuous function of direction, then in order to determine the directions with a zero value of thermal expansion, the following ratio must be satisfied: αn = 0. This can only happen if the main components of the thermal expansion tensor have different symbols. The Mathcad Prime 6 software complex has defined a function that performs the calculation of the value of thermal expansion coefficients in crystals in any direction, calculated the value and position of extremums of thermal expansion coefficients, and constructed an index surface, a stereographic projection of the index surface and the cross section of the index surface of thermal expansion coefficients X1X3. The lowest and highest values of the thermal expansion coefficient of the crystal have been found.
考虑了利用材料的各向异性选择具有极值性能的材料的问题。对于冶金型材专家来说，不仅要能够为完成既定的工程任务而选择材料，而且要能够利用材料的各向异性，并能够利用材料性能的极值来确定材料的取向。以热膨胀系数为例，对张量系数的各向异性进行了数学建模和计算机分析。由于热膨胀与晶体的任何张量物理性质一样，是方向的连续函数，因此为了确定热膨胀为零的方向，必须满足以下比值:αn = 0。只有当热膨胀张量的主要分量有不同的符号时，这种情况才会发生。Mathcad Prime 6软件复合体定义了计算晶体任意方向热膨胀系数值的函数，计算了热膨胀系数极值的值和位置，构造了一个指标面、指标面的立体投影和热膨胀系数X1X3的指标面截面。得到了晶体热膨胀系数的最小值和最大值。
{"title":"MATHEMATICAL MODELING OF PHYSICAL PROPERTIES OF ANISOTROPIC MATERIALS","authors":"Yu. A. Belokon’, A. Yavtushenko, V. Protsenko, Y. Bondarenko, A. Cheilytko","doi":"10.37904/metal.2020.3500","DOIUrl":"https://doi.org/10.37904/metal.2020.3500","url":null,"abstract":"The problem of selecting a material with an extreme value of its performance using its anisotropy is considered. It is important for specialists of metallurgical profile to be able not only to select the material for realization of the set engineering task, but also to use its anisotropy, and to be able to determine the orientation of the material with the extreme value of its performance. Mathematical modeling and computer analysis of anisotropy of tensor coefficients using the example of thermal expansion coefficient have been performed. Since thermal expansion, like any tensor physical property of crystals, is a continuous function of direction, then in order to determine the directions with a zero value of thermal expansion, the following ratio must be satisfied: αn = 0. This can only happen if the main components of the thermal expansion tensor have different symbols. The Mathcad Prime 6 software complex has defined a function that performs the calculation of the value of thermal expansion coefficients in crystals in any direction, calculated the value and position of extremums of thermal expansion coefficients, and constructed an index surface, a stereographic projection of the index surface and the cross section of the index surface of thermal expansion coefficients X1X3. The lowest and highest values of the thermal expansion coefficient of the crystal have been found.","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":"91306370","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}
Organic coatings are widely employed in the corrosion protection of most metal surfaces, particularly steel. They provide a barrier against corrosive species present in the environment, due to their high resistance to oxygen, water and ions transport. This study focuses on the evaluation of corrosion protection performance of epoxy paint on the carbon steel surface in chloride environment (3% NaCl) by Electrochemical Impedance Spectroscopy (EIS). The electrochemical behavior of painted surface was estimated by EIS parameters that contained paint film resistance, paint film capacitance and double layer capacitance. On the basis of calculation using EIS spectrums it was observed that pore resistance (Rpore ) decreased with the appearance of doubled layer capacitance (Cdl ) due to the electrolyte penetration through the film. This was further confirmed by the decrease of diffusion resistance (Rd ) which was also the indicator of the deterioration of paint film protectiveness. Microscopic analyses have shown that oxidation dominates the corroded surfaces.
{"title":"EIS study of the corrosion behavior of an organic coating applied on Algerian oil tanker","authors":"N. Hammouda, K. Belmokre","doi":"10.1051/metal/2020064","DOIUrl":"https://doi.org/10.1051/metal/2020064","url":null,"abstract":"Organic coatings are widely employed in the corrosion protection of most metal surfaces, particularly steel. They provide a barrier against corrosive species present in the environment, due to their high resistance to oxygen, water and ions transport. This study focuses on the evaluation of corrosion protection performance of epoxy paint on the carbon steel surface in chloride environment (3% NaCl) by Electrochemical Impedance Spectroscopy (EIS). The electrochemical behavior of painted surface was estimated by EIS parameters that contained paint film resistance, paint film capacitance and double layer capacitance. On the basis of calculation using EIS spectrums it was observed that pore resistance (Rpore ) decreased with the appearance of doubled layer capacitance (Cdl ) due to the electrolyte penetration through the film. This was further confirmed by the decrease of diffusion resistance (Rd ) which was also the indicator of the deterioration of paint film protectiveness. Microscopic analyses have shown that oxidation dominates the corroded surfaces.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"59 4 1","pages":"610"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90684962","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.2020.3470
A. Schrek, A. Brusilová, P. Sejč, M. Pokusová
{"title":"EVALUATION OF THE FORMABILITY OF Al-ALLOY EN-AA 6000 T6","authors":"A. Schrek, A. Brusilová, P. Sejč, M. Pokusová","doi":"10.37904/metal.2020.3470","DOIUrl":"https://doi.org/10.37904/metal.2020.3470","url":null,"abstract":"","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81827564","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.2020.3556
J. Averina, G. Kalyakina, V. Boldyrev, A. G. Cherednichenko, E. Rybina
Chrome plating is widely used as a protective and decorative coating and to increase the wear resistance of measuring and cutting tools. To improve the properties of the chrome coating, nanosized particles are coprecipitated with it. Since nanodiamond particles possess the properties of diamond, that is, superhardness, low coefficient of friction, high thermal conductivity and chemical inertness, they are used precisely during deposition with chromium. This article presents a study of chromium-diamond coating. Determination of its wear resistance, microhardness, porosity and other indicators. The use of chromium-diamond coating allows to improve to a greater extent the physicomechanical indices of hard chromium plating, as well as to increase corrosion resistance and increase the service life of parts operating under conditions of corrosion wear.
{"title":"RESEARCH OF WEAR RESISTANCE OF CHROME DIAMOND COATING","authors":"J. Averina, G. Kalyakina, V. Boldyrev, A. G. Cherednichenko, E. Rybina","doi":"10.37904/metal.2020.3556","DOIUrl":"https://doi.org/10.37904/metal.2020.3556","url":null,"abstract":"Chrome plating is widely used as a protective and decorative coating and to increase the wear resistance of measuring and cutting tools. To improve the properties of the chrome coating, nanosized particles are coprecipitated with it. Since nanodiamond particles possess the properties of diamond, that is, superhardness, low coefficient of friction, high thermal conductivity and chemical inertness, they are used precisely during deposition with chromium. This article presents a study of chromium-diamond coating. Determination of its wear resistance, microhardness, porosity and other indicators. The use of chromium-diamond coating allows to improve to a greater extent the physicomechanical indices of hard chromium plating, as well as to increase corrosion resistance and increase the service life of parts operating under conditions of corrosion wear.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","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":"89294489","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.2020.3634
Ondřej Grycz, Vít Pasker, Robert Hlavica, Pavel Foretník
The article deals with using computational method and digital filters in power grid quality analysis in metallurgical industry. Almost all of metallurgical factories using large engines, arc furnace, induction heating and so on. This amount of non-linear loads which are connected to power grids cause heavy disturbances, which can cause big problems like damage or even destruction of machines or devices connected near the point, where disturbances occur, for examples near cities. Identification of disturbances is then very important for elimination of these problems. The article describe usage of digital filters which are applied on measured signal from power grid. Using these types of digital filters is necessary for identification problem in power grid.
{"title":"using advanced computational methods for power grid analysis in metallurgical industry","authors":"Ondřej Grycz, Vít Pasker, Robert Hlavica, Pavel Foretník","doi":"10.37904/metal.2020.3634","DOIUrl":"https://doi.org/10.37904/metal.2020.3634","url":null,"abstract":"The article deals with using computational method and digital filters in power grid quality analysis in metallurgical industry. Almost all of metallurgical factories using large engines, arc furnace, induction heating and so on. This amount of non-linear loads which are connected to power grids cause heavy disturbances, which can cause big problems like damage or even destruction of machines or devices connected near the point, where disturbances occur, for examples near cities. Identification of disturbances is then very important for elimination of these problems. The article describe usage of digital filters which are applied on measured signal from power grid. Using these types of digital filters is necessary for identification problem in power grid.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81655861","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.2020.3460
J. Schéele, Vladimír Zilka
Using oxyfuel combustion in steel reheating provides higher throughput and substantial fuel savings. Accordingly, oxyfuel has many benefits, but also some drawbacks like hot spots in furnaces and thermal NOx generation. However, by making the combustion “Flameless” by creating a ‘volume combustion’, these issues can be overcome, and additional advantages can be achieved. This paper describes different solutions, both fully flameless and semi flameless, which have been developed and implemented in steel reheating and annealing furnaces. Over the past three decades, Linde has made more than 160 oxyfuel installations in all types of reheating furnaces, both batch and continuous, and for production of all different steel grades. Since 2003, focus has been on using Flameless Oxyfuel, hitherto resulting in 112 successful installations, 90 of these operating fully with 100 % Flameless Oxyfuel. This paper describes results from these installations, which include fuel savings of up to 60 %, increased throughput by up to 50 %, substantial reductions of CO2 and NOx emissions, much improved temperature uniformity of the heated steel, reduction of scale losses by up to 50 %. Cases with conversion from air-fuel to Flameless Oxyfuel will are described. These examples comprise installations in soaking pit furnaces, rotary hearth furnaces, roller hearth furnaces, and walking beam furnaces with up to 300 t/h nominal capacity, and for production of carbon steel, engineering steel, and stainless steel grades at companies in USA, Europe, and Asia.
{"title":"SUCCESSFUL USE OF FLAMELESS OXYFUEL IN STEEL REHEATING","authors":"J. Schéele, Vladimír Zilka","doi":"10.37904/metal.2020.3460","DOIUrl":"https://doi.org/10.37904/metal.2020.3460","url":null,"abstract":"Using oxyfuel combustion in steel reheating provides higher throughput and substantial fuel savings. Accordingly, oxyfuel has many benefits, but also some drawbacks like hot spots in furnaces and thermal NOx generation. However, by making the combustion “Flameless” by creating a ‘volume combustion’, these issues can be overcome, and additional advantages can be achieved. This paper describes different solutions, both fully flameless and semi flameless, which have been developed and implemented in steel reheating and annealing furnaces. Over the past three decades, Linde has made more than 160 oxyfuel installations in all types of reheating furnaces, both batch and continuous, and for production of all different steel grades. Since 2003, focus has been on using Flameless Oxyfuel, hitherto resulting in 112 successful installations, 90 of these operating fully with 100 % Flameless Oxyfuel. This paper describes results from these installations, which include fuel savings of up to 60 %, increased throughput by up to 50 %, substantial reductions of CO2 and NOx emissions, much improved temperature uniformity of the heated steel, reduction of scale losses by up to 50 %. Cases with conversion from air-fuel to Flameless Oxyfuel will are described. These examples comprise installations in soaking pit furnaces, rotary hearth furnaces, roller hearth furnaces, and walking beam furnaces with up to 300 t/h nominal capacity, and for production of carbon steel, engineering steel, and stainless steel grades at companies in USA, Europe, and Asia.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","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":"81963119","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}
The microstructural characterization and mechanical behavior of Cr25Ni35NbM/15CrMo and Cr25Ni35NbM/SUS321 dissimilar weld joints were studied in this paper. The microstructure, room temperature and high temperature (1173 K) tensile strength of dissimilar weld joints were analyzed through optical microscopy (OM), scanning electron microscopy (SEM) and electronic universal tensile testing machine. The microstructure of HAZ in 15CrMo steel of Cr25Ni35NbM/15CrMo dissimilar weld joint transformed from ferrite-pearlite into ferrite-martensite. A large volume fraction of α phase was found to have precipitated in the HAZ of SUS321 austenitic stainless steel for Cr25Ni35NbM/SUS321 dissimilar weld joint. At room temperature, the tensile strength and yield strength of these two type dissimilar weld joints is less than Cr25Ni35NbM alloy similar weld joint. The high temperature tensile strength of these two type dissimilar weld joints is less than Cr25Ni35NbM alloy similar weld joint. Both at room and high temperature, the fracture locations of two types dissimilar weld joints are the HAZ of the base metal 15CrMo and SUS321 stainless steel, respectively. It indicates that the weak part of the Cr25Ni35NbM alloy dissimilar weld joints is the low-performance base metals 15CrMo and SUS321 stainless steel.
{"title":"Microstructural characterization and mechanical behavior of Cr25Ni35NbM alloy dissimilar weld joint for application in a hydrogen reformer furnace","authors":"Jingfeng Guo, Wenwen Liu, Chunxiu Li, Xiaoming Zhang","doi":"10.1051/metal/2020067","DOIUrl":"https://doi.org/10.1051/metal/2020067","url":null,"abstract":"The microstructural characterization and mechanical behavior of Cr25Ni35NbM/15CrMo and Cr25Ni35NbM/SUS321 dissimilar weld joints were studied in this paper. The microstructure, room temperature and high temperature (1173 K) tensile strength of dissimilar weld joints were analyzed through optical microscopy (OM), scanning electron microscopy (SEM) and electronic universal tensile testing machine. The microstructure of HAZ in 15CrMo steel of Cr25Ni35NbM/15CrMo dissimilar weld joint transformed from ferrite-pearlite into ferrite-martensite. A large volume fraction of α phase was found to have precipitated in the HAZ of SUS321 austenitic stainless steel for Cr25Ni35NbM/SUS321 dissimilar weld joint. At room temperature, the tensile strength and yield strength of these two type dissimilar weld joints is less than Cr25Ni35NbM alloy similar weld joint. The high temperature tensile strength of these two type dissimilar weld joints is less than Cr25Ni35NbM alloy similar weld joint. Both at room and high temperature, the fracture locations of two types dissimilar weld joints are the HAZ of the base metal 15CrMo and SUS321 stainless steel, respectively. It indicates that the weak part of the Cr25Ni35NbM alloy dissimilar weld joints is the low-performance base metals 15CrMo and SUS321 stainless steel.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"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":"89443541","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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