University of Oulu

Atef Hamada, Mohammed Ali, Sumit Ghosh, Matias Jaskari, Markku Keskitalo, Antti Järvenpää, Mechanical performance and formability of laser-welded dissimilar butt joints between medium-Mn stainless steel and high-strength carbon steel, Materials Science and Engineering: A, Volume 831, 2022, 142200, ISSN 0921-5093, https://doi.org/10.1016/j.msea.2021.142200

Mechanical performance and formability of laser-welded dissimilar butt joints between medium-Mn stainless steel and high-strength carbon steel

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Author: Hamada, Atef1; Ali, Mohammed2,3; Ghosh, Sumit2;
Organizations: 1Kerttu Saalsti Institute, Future Manufacturing Technologies (FMT) University of Oulu, Pajatie 5, Nivala FI-85500, Finland
2Materials and Mechanical Engineering, Centre for Advanced Steels Research, University of Oulu, Oulu FI-90014, Finland
3Steel Technology Department, Central Metallurgical Research and Development Institute, Helwan, 11421, Cairo, Egypt
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 33.6 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2022030822364
Language: English
Published: Elsevier, 2022
Publish Date: 2022-03-08
Description:

Abstract

The mechanical performance and stretch formability of dissimilar butt joints between medium-Mn stainless steel (MMn-SS) and high-strength carbon steel (HS-CS) processed by laser welding using different parameters were studied under uniaxial and biaxial loadings applied by tensile and Erichsen cupping tests, respectively. Laser scanning microscopy and electron backscatter diffraction (EBSD) were used to study the microstructural evolution. An electron probe microanalyzer (EPMA) was employed to analyse the distribution of alloying elements within the weld zone. The dominating deformation mechanisms operating in the paired metals during stretch-forming were identified through EBSD analysis. The study revealed that a fully martensitic microstructure is promoted in the fusion zones (FZs) of the weldments processed with low and high specific point energy (SPE 19, 25, and 30 J). Consequently, hardness values of the FZs were slightly decreased with SPE. Similarly, tensile properties were not affected since failure occurred at the softer base metal HS-CS.

During stretch-forming deformation by Erichsen cupping tests, the dissimilar metals exhibited various operating deformation mechanisms. The formation of shear bands (SBs) and strain-induced martensite along the SBs were observed to be the biaxial strain-induced microstructural features in the MMn-SS. However, the HS-CS was deformed by the general deformation mode, i.e., dislocation-mediated plasticity.

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Series: Materials science & engineering. A, Structural materials: properties, microstructure and processing
ISSN: 0921-5093
ISSN-E: 1873-4936
ISSN-L: 0921-5093
Volume: 831
Article number: 142200
DOI: 10.1016/j.msea.2021.142200
OADOI: https://oadoi.org/10.1016/j.msea.2021.142200
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
214 Mechanical engineering
Subjects:
Copyright information: © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
  https://creativecommons.org/licenses/by/4.0/