<正> 本文选用四种中碳钢,其含碳量及机械性能列于表1.表1中的字母Ⅰ,Ⅱ分別代表一次正火及二次正火加回火的热处理工艺.
Notch fracture machanics was used to investigate the fatigue crack initiation from the notch tip for medium carbon steels (0.4-0.6 wt-%C). The relationships between the maximum stress range at the notch root, △σ_(max), and the number of cycles before fatigue crack initiation, N_i, have been determined. Furthermore, the threshold stress of fatigue crack initiation, △σ_(max)th, as a function of C content or of yield strength of the steel has been proposed.
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