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

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...

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Bibliographic Details
Published in:Key engineering materials 2021-04, Vol.883, p.258-265
Main Authors: Hietala, Mikko, Jaskari, Matias, Järvenpää, Antti, Hamada, Atef S., Keskitalo, Markku
Format: Article
Language:English
Subjects:
Austenitic stainless steels
Butt joints
Columnar structure
Deformation analysis
Dissimilar material joining
Ferritic stainless steels
Formability
Grain boundaries
Laser beam welding
Metal sheets
Microstructure
Shielding
Solid phases
Welded joints
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Summary: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.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.883.258