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在转盘式冲击疲劳试验机上进行了冲击疲劳试验。应用断裂力学及断口照像技术,研究了原始奥氏体晶粒尺寸、韧—脆转变温度及试验温度对淬回火Cr-M。合金钢冲击疲劳裂纹扩展速率的影响(试验用钢原始奥氏体晶粒尺寸在8.3μm～25.4μm范围内变化)。所得冲击疲劳试验结果和非冲击疲劳情况进行了比较。无论是冲击还是非冲击疲劳,当裂纹从辉纹形式扩展时,其扩展速率对奥氏体晶粒尺寸、韧-脆转变温度及试验
Impact fatigue test was conducted on a turntable impact fatigue testing machine. Fracture mechanics and fracture photography were used to study the austenite grain size, ductile-brittle transition temperature and test temperature on quenched and tempered Cr-M. Effect of Impact Fatigue Crack Growth Rate of Alloy Steel (Original austenite grain size of test steel varied from 8.3μm to 25.4μm). The resulting impact fatigue test results are compared with non-impact fatigue conditions. Both impact and non-impact fatigue, the rate of expansion of austenite grain size, ductile-brittle transition temperature, and test