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Non-destructive characterisation of laser hardened steels. Pt.2: Metallography and residual stresses

: Ruch, Marta; Cosarinsky, Guillermo; Kopp, Melanie; Rabung, Madalina; Vega, Daniel; Amiri, Meisam; Fava, Javier


Insight 59 (2017), No.6, pp.311-317
ISSN: 1354-2575
ISSN: 0007-1137
Bundesministerium für Bildung und Forschung BMBF
AL-1109; MINCyT
Journal Article
Fraunhofer IZFP ()
micromagnetic multiparameter microstructure and stress analysis; laser hardening; steel component

Surface laser hardening of steels is a well-established industrial technology. The surface of the specimen is scanned with a high-power laser beam along the trace to be hardened. The rapid cooling due to the non-heated surroundings of the laser-treated zones leads to local hardening of the material. Non-destructive evaluation of some mechanical properties (hardness, residual stresses, etc) of the hardened region and the heat-affected zone are of technological importance. A previous paper reported non-destructive testing (NDT) experiments (by scanning of the specimens) made with the 3MA-II (Multiparameter Micromagnetic Microstructure and Stress Analysis) equipment developed by the Fraunhofer Institute for Non-Destructive Testing (IZFP), Saarbrücken. This contribution presents an X-ray diffraction evaluation of the residual stresses in laser-hardened SAE 1045 steels and metallographic studies of the affected areas. The results are compared with the previously reported 3MA-II output.