利用超声疲劳实验方法研究了2种商业42CrMo钢和2种零夹杂42CrMo钢在不同热处理制度下的超长寿命疲劳性能.结果表明,42CrMo钢疲劳S-N曲线在106-109cyc范围内无平台出现,疲劳极限消失;零夹杂42CrMo钢在此寿命区间有明显的疲劳极限.SEM断口观察表明,42CrMo试样疲劳开裂大多起源于非金属夹杂物,而零夹杂42CrMo全部起源于基体表面.零夹杂42CrMo钢的最大特点是在2×106-109cyc内不易发生疲劳断裂,疲劳寿命的可靠性显著增加.
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