MECHANISM MAP OF TORSIONAL FATIGUE FRACTURE

Acta Metall Sin

1990, Vol. 26

Issue (5): 50-55 DOI:

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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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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

Key words: mechanism map torsional fatigue fracture

Received: 18 May 1990

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1990/V26/I5/50

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