高マンガンオーステナイト鋳鋼のころがり疲労強度に及ぼす結晶粒径の影響

概要

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The rolling contact fatigue tests were carried out on a high manganese austenitic cast steel to investigate the influence of grain size on the rolling contact fatigue strength by using a Nishihara-type wear testing machine under a lubricated state with a relative slip ratio (-9 %). The main results obtained are summarized as follows:(1) The rolling contact fatigue limit of the high manganese austenitic cast steel increased remark- ably with reducing grain size. (2) The effect of heat treatment on the reduction of grain size was almost equal to that of forging. (3) The rolling contact fatigue limit of the high manganese austenitic cast steel increased remark- ably with work handening generated by repeated contact stress. (4) A crack in the high manganese austenitic cast steel propagated through the large cyclic -strained zone in the parallel direction with the contact surface. Its depth is in the vicinity of the region (Z_0) having the maximum stress value calculated by the maximum shearing stress theory.
1988-07-15