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Dissimilar laser beam welding of press hardened stainless martensitic steels and a cold worked stainless TWIP steel

: Dahmen, Martin; Deniz, Berkan; Lindner, Stefan; Petring, Dirk

Wissenschaftliche Gesellschaft Lasertechnik -WLT-:
Lasers in Manufacturing, LiM 2019. CD-ROM : Munich ICM, Internationales Congress Center München, Germany, June 24-27, 2019 : World of Photonics Congress
Erlangen: WGL, 2019
10 pp.
Lasers in Manufacturing Conference (LiM) <2019, Munich>
World of Photonics Congress <2019, Munich>
Conference Paper
Fraunhofer ILT ()
laser beam welding; microstructure; alloy composition; hardness

Combinations of ultra-high strength and supra-ductile steels promise a multitude of benefits for steel construction in vehicle manufacturing. Laser beam welding is an appropriate tool for joining both materials due to its concentrated energy input. Results of research on laser beam welding of two press hardened steels, X46Cr13 (1.4034) and 37MnB5 (1.5538), and a dual phase steel DP980 (1.0944) to an X30MnCrN16-14 (1.4678), cold formed to 1000 MPa yield strength, will be reported. The resulting predominantly austenitic microstructure enables crack-free welding. Because of the cast structure in the weld material a loss of strength has to be considered. Hardness slopes in the heat affected zone of TWIP steel and significant softening in the press-hardened steel in conjunction with an inhomogeneous solidification structure in the fused zone leads to a complex strength profile in the weld zone. Insights will be given on microstructures, local chemical composition and hardness of the fused zone.