本文研究了40Cr钢不同回火态,不同应力水平下缺口扭转疲劳断裂的寿命、宏观断口类型和微观断裂机制。断口分析表明,在同一回火温度下,随着应力的升高,断裂类型由正应力断裂→纵向剪切断裂→横向剪切断裂转变;同一应力水平下,随着强度的增加,断裂类型由剪切型向正断型转变;正断型的断裂机制为:T→S+I→D+I,剪切型的断裂机制为:T→S′→D。根据本工作结果总结出扭转疲劳断裂机制图。
Studies have been made of the torsional fatigue fracture life of notch-ed specimens, the macroscope fractograph and microscopic fracturing mechanism of40Cr steel as various tempered states under different stresses. With the increase ofstress, the fracture type changes from normal stress fracture to longitudinal shear oneand then transversal shear one. Under same stress but with the increase of strength,the fracture type transferred from shear to normal stress fracture. The mechanism ofnormal stress fracture may be: transgranular fracture→striation + intergranular frac-ture→dimple + intergranular fracture, and of shear fracture may be: transgranular
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