真空冶炼与电渣重熔2种工艺制备的GCr15轴承钢的超高周疲劳测试结果表明,电渣 重熔能更好地控制钢中夹杂尺寸及其分散性, 因此具有较好的疲劳性能.实验与理论分析表 明, 对于一定强度的材料, 疲劳萌生处的颗粒亮区(GBF)边界处的应力强度因子范围 (αK GBF$ )为一恒定值,且随材料的屈服强度增加αK GBF逐渐减小.
Abstract: The very high cycle fatigue properties of bearing steel GCr15 prepared by two processing routes are studied in this paper. It is demonstrated that compared with vacuum melting (VM), the specimens prepared by electroslag remelting (ER) have smaller and narrow distribution of the inclusion size. Therefore, the specimens prepared by ER exhibit a better fatigue property. Experimental results and theoretical analysis demonstrate that the stress intensity factor range at the GBF boundary ， ΔKGBF , keeps a constant if the steels are with an identical strength, and it will decrease with the increase of yield strength.
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