Metallurgical and Mechanical Characterization of Low Carbon Steel—Stainless Steel Dissimilar Joints Made by Laser Autogenous Welding
This paper addresses the metallurgical and mechanical characterization of dissimilar joints made by laser autogenous welding between thin sheets of low-carbon steel (CS) and austenitic stainless steel (SS). The welding technology applied, previously optimized to produce sound dissimilar joints, is b...
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MDPI AG
2021-05-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/5/810 |
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| author | Elena Scutelnicu Mihaela Iordachescu Carmen Catalina Rusu Danut Mihailescu José Luis Ocaña |
| author_facet | Elena Scutelnicu Mihaela Iordachescu Carmen Catalina Rusu Danut Mihailescu José Luis Ocaña |
| author_sort | Elena Scutelnicu |
| collection | DOAJ |
| description | This paper addresses the metallurgical and mechanical characterization of dissimilar joints made by laser autogenous welding between thin sheets of low-carbon steel (CS) and austenitic stainless steel (SS). The welding technology applied, previously optimized to produce sound dissimilar joints, is based on the heat source displacement from the weld gap centerline towards CS, in order to reduce the SS overheating. The research includes optical microscopy observations, energy dispersive X-ray analysis (EDX) to assess the wt% of Cr, Ni, and Fe in all regions of the dissimilar welded joint, hardness measurements, and tensile tests of transverse-welded flat specimens. In comparison with classical determination of the joint overall mechanical characteristics, the novelty of this research consists of experimental assessment of the local mechanical behavior of the fusion and heat affected zones by using a digital image correlation technique (VIC-2D). This is an efficient tool for determining the constitutive properties of the joint, useful for modelling the mechanical behavior of materials and for verifying the engineering predictions. The results show that the positive difference in yielding between the weld metal and the base materials protects the joint from being plastically deformed. As a consequence, the tensile loading of flat transverse specimens generates the strain localization and failure in CS, far away from the weld. |
| first_indexed | 2024-03-10T11:21:46Z |
| format | Article |
| id | doaj.art-32bc4d9d8c924625989ccdcd62a90aac |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T11:21:46Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-32bc4d9d8c924625989ccdcd62a90aac2023-11-21T19:57:58ZengMDPI AGMetals2075-47012021-05-0111581010.3390/met11050810Metallurgical and Mechanical Characterization of Low Carbon Steel—Stainless Steel Dissimilar Joints Made by Laser Autogenous WeldingElena Scutelnicu0Mihaela Iordachescu1Carmen Catalina Rusu2Danut Mihailescu3José Luis Ocaña4Manufacturing Engineering Department, Faculty of Engineering, “Dunarea de Jos” University of Galati, 800008 Galati, RomaniaMaterials Science Department, E.T.S. de Ingenieros de Caminos, Canales y Puertos, Universidad Politécnica de Madrid, 28040 Madrid, SpainManufacturing Engineering Department, Faculty of Engineering, “Dunarea de Jos” University of Galati, 800008 Galati, RomaniaManufacturing Engineering Department, Faculty of Engineering, “Dunarea de Jos” University of Galati, 800008 Galati, RomaniaLaser Centre, Universidad Politécnica de Madrid, 28031 Madrid, SpainThis paper addresses the metallurgical and mechanical characterization of dissimilar joints made by laser autogenous welding between thin sheets of low-carbon steel (CS) and austenitic stainless steel (SS). The welding technology applied, previously optimized to produce sound dissimilar joints, is based on the heat source displacement from the weld gap centerline towards CS, in order to reduce the SS overheating. The research includes optical microscopy observations, energy dispersive X-ray analysis (EDX) to assess the wt% of Cr, Ni, and Fe in all regions of the dissimilar welded joint, hardness measurements, and tensile tests of transverse-welded flat specimens. In comparison with classical determination of the joint overall mechanical characteristics, the novelty of this research consists of experimental assessment of the local mechanical behavior of the fusion and heat affected zones by using a digital image correlation technique (VIC-2D). This is an efficient tool for determining the constitutive properties of the joint, useful for modelling the mechanical behavior of materials and for verifying the engineering predictions. The results show that the positive difference in yielding between the weld metal and the base materials protects the joint from being plastically deformed. As a consequence, the tensile loading of flat transverse specimens generates the strain localization and failure in CS, far away from the weld.https://www.mdpi.com/2075-4701/11/5/810laser autogenous weldingbi-metallic jointmicrostructurehardnessmechanical properties |
| spellingShingle | Elena Scutelnicu Mihaela Iordachescu Carmen Catalina Rusu Danut Mihailescu José Luis Ocaña Metallurgical and Mechanical Characterization of Low Carbon Steel—Stainless Steel Dissimilar Joints Made by Laser Autogenous Welding Metals laser autogenous welding bi-metallic joint microstructure hardness mechanical properties |
| title | Metallurgical and Mechanical Characterization of Low Carbon Steel—Stainless Steel Dissimilar Joints Made by Laser Autogenous Welding |
| title_full | Metallurgical and Mechanical Characterization of Low Carbon Steel—Stainless Steel Dissimilar Joints Made by Laser Autogenous Welding |
| title_fullStr | Metallurgical and Mechanical Characterization of Low Carbon Steel—Stainless Steel Dissimilar Joints Made by Laser Autogenous Welding |
| title_full_unstemmed | Metallurgical and Mechanical Characterization of Low Carbon Steel—Stainless Steel Dissimilar Joints Made by Laser Autogenous Welding |
| title_short | Metallurgical and Mechanical Characterization of Low Carbon Steel—Stainless Steel Dissimilar Joints Made by Laser Autogenous Welding |
| title_sort | metallurgical and mechanical characterization of low carbon steel stainless steel dissimilar joints made by laser autogenous welding |
| topic | laser autogenous welding bi-metallic joint microstructure hardness mechanical properties |
| url | https://www.mdpi.com/2075-4701/11/5/810 |
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