通过拉伸-拉伸疲劳试验观测研究了渗碳钢经淬火和回火后在裂纹萌生前的疲劳行为。实验中发现:这种钢出现表层的疲劳软化与芯部的疲劳硬化共存的现象;在圆试样的渗碳层深度附近,有着一个过渡区,它将整个横截面分为向外的疲劳软化区和向内的疲劳硬化区;随外加最大循环应力和循环次数的增加,表层的疲劳软化程度和芯部的疲劳硬化程度都增加。
The fatigue behavior prior to crack initiation of carburizing steel undergone quench-ing and tempering was observed under tension-tension fatigue test. The steel experiencescoexistence of fatigue softening in the case and fatigue hardening in the core. A transition re-gion near the case depth of the steel divides the whole cross section of a round specimen intotwo parts: the fatigue softening part outwards and the fatigue hardening part inwards. Bothmay be intensified with the increase of the applied maximum cyclic stress and the number ofcycles.
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