Microstructure and Formability of Laser Welded Dissimilar Butt Joints of Austenitic-Ferritic Stainless Steels

Abstract:

Dissimilar laser welding of ferritic, type EN 1.4509, and austenitic, type EN 1.4307, stainless steel sheets was conducted at different energy inputs 30 and 80 J/mm and under different shield gases Ar and N and without shielding gas to evaluate the microstructure and hardness of the welded zone. The formability tests, using Erichsen principle, were carried out to determine the deformation behaviour of the dissimilar welded joints under biaxial straining. The fusion zone microstructure analysis revealed that the predominant phase structure is columnar coarse ferritic grains with slightly small content of austenite in the ferrite grain boundaries. The formability of the welded joints under Ar and N shielding gases is significantly improved, i.e., higher plasticity, compared with welded joints without shielding gas at both energy inputs.

• Periodical: Key Engineering Materials (Volume 883)
• Pages: 258-265
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.883.258
• Online since: April 2021
• Authors: Markku Keskitalo*, Atef Saad Hamada, Mikko Hietala, Matias Jaskari, Antti Järvenpää
• Keywords: Forming, Laser Welding, Stainless Steel

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