環境調和形・表面改質SMn鋼の疲労信頼性に係わるき裂発生機構解析

概要

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To improve the fatigue reliability for SMn 435 steel by an environmentally sound surface modification, the influence of the modification on fracture mechanism was studied experimentally. The fatigue properties of SMn 435 are found to be obviously improved by gas soft-nitriding, so that they can no longer be estimated by using a concept of "S-N Globe"which has successfully been applied to many surface-treated materials. The detailed observations have revealed that fatigue crack initiation in a gas soft-nitrided SMn 435 specimen occurs in a hardened region near surface not in a subsurface region with virgin microstructure. The crack initiation is attributable to cyclic plastic deformation in the subsurface region. Such a crack initiation mechanism is different from that previously observed in other surface treated materials, explaining the reason why the S-N Globe concept can not be applied to the present case.
一般社団法人日本機械学会の論文
1998-06-25