ガス軟窒化とレーザー焼入との複合処理

概要

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Recently, attention has being given to combining currently used techniques to derive desirable properties that hitherto could not be obtained. Accordingly, the effect of combining of gas soft-nitriding and laser transformation hardening on S45C and SCM435, and specifically on wear resistance, was investigated.Results obtained are summarized as follows:1) The nitride layer formed by gas soft-nitriding was considerably decomposed by laser beam irradiation.2) X-ray diffraction on specimens subjected to the combination treatment comfirmed the small amount of ε and γ, together with retained γ and FeO.3) It was observed that the combination-treated specimen had a fine nitrogen-containing martensite structure with a high hardness of Hv 820.4) Wear resistance of the combination-treated specimens improved markedly, particularly in the range of stationary wear. This was considered to be due to the high hardness of the fine nitrogen-containing martensite.
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