K-0715 スーパ表面改質材の疲労信頼性に関するフラクトグラフィ的研究(S07-4 疲労信頼性の向上(薄膜,窒化))(S07 表面改質とその機能特性評価)

概要

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The experimental research was carried out in the fatigue reliability evaluation of the high speed tool steel which conducted compound surface modification. Especially, it focused on fracture surface analysis by SEM in this study. In spite of conducting compound surface modification, the fatigue reliability of the PN+TiAlN material which was coated TiAlN by PVD after the plasma nhridation was conducted tended to be inferior than that of the TiAlN material which conducted TiAlN coating by PVD. However, uniform fatigue reliability evaluation of the surface modified material is difficult for these S-N curves, since the dispersion in the fatigue life is abounding. The fatigue life of each surface modified material was arranged by Weibull probability distribution. By this distribution, it became the clearness that the fatigue life of the TiAlN material was longer than that of the PN+TiAlN material. As a result of the detailed fractography on fracture surface, the fracture morphology was internal fracture of fish eye type that broke from fracture origin of the sonims that exist in the material inside. In the compound surface modified material, it is indicated with that the crack became easy to be generated from large inclusion in order to stiffen material surface by the plasma nitridantion. Therefore, the fatigue reliability of the PN+TiAlN material is inferior to that of the TiAlN material.
一般社団法人日本機械学会の論文
2001-08-22