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对 4 0Cr调质试样先进行了 0 .6N(N为全寿命 )拉 拉疲劳试验 ,再中温热等静压 ,在随后的继续拉 拉疲劳试验中 ,发现其数据分散度降低 ,疲劳寿命大幅度提高。经分析 ,认为其主要原因是 ,中温热等静压使试样表面硬度增加 ,残余压应力提高 ,约束并减缓了随后继续疲劳试验时损伤区微裂纹的发展。
On the 40C quenched and tempered specimens, 0.6N (N is the whole life) tensile fatigue test was carried out, followed by warm isostatic pressing. In the subsequent tensile fatigue test, it was found that the data dispersion degree was reduced and fatigue Significant increase in life expectancy. The analysis shows that the main reason is that the medium temperature hot isostatic pressing increases the surface hardness and the residual compressive stress, which restrains and slows the development of the micro-cracks in the damaged area after the subsequent fatigue test.