Non-destructive characterisation of laser hardened steels. Part 2: Metallography and residual stresses
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.
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Document Type: Research Article
Publication date: June 1, 2017
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- Official Journal of The British Institute of Non-Destructive Testing - includes original research and devlopment papers, technical and scientific reviews and case studies in the fields of NDT and CM.
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