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MECHANISM MAP OF TORSIONAL FATIGUE FRACTURE |
HU Zhizhong;WU Yusheng;CAI Heping;MA Lihua Xi'an Jiaotong University |
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Cite this article:
HU Zhizhong;WU Yusheng;CAI Heping;MA Lihua Xi'an Jiaotong University. MECHANISM MAP OF TORSIONAL FATIGUE FRACTURE. Acta Metall Sin, 1990, 26(5): 50-55.
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Abstract 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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Received: 18 May 1990
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1 John A, et al. Metals Randbook. Vol. 9. 8th ed.. Ohio: ASM. 1974: 43 2 西安交通大学金属材料及强度研究所.金属热处理,1980;11:38 3 颜祥智,吴玉声.金属热处理,1983;7:40 4 Zhang P S, Hu Z Z, Zhou H J. Int J Fatigue, 1984; 6(1) : 49 5 胡志忠,郭大展,安仁杰.金属学报,1986;22:A79@ |
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