Fatigue performance and crack initiation of 16Cr3NiWMoVNbE gear steel

doi:10.13251/j.issn.0254-6051.2020.07.034

Abstract

Abstract: Gear steel 16Cr3NiWMoVNbE was prepared by VIM+VAR process. The fatigue limit and S-N curve of the test steel were measured. The fatigue crack initiation type and influencing factors were analyzed by observing the fracture. The results show that the ultimate fatigue strength is 773 MPa, and the fatigue cracks originate from resident slip bands, surface defects, near-surface inclusions, and sub-surface inclusions. Initiated fatigue cracks on the surface resident slip band account for 13%, initiation cracks on surface defects account for 33.3%, initiation of near-surface inclusions accounts for 40%, and initiation of sub-surface inclusions accounts for 13%. When fatigue cracks originate from internal inclusions, the fatigue life decreases with increasing stress; under certain actual stresses, the fatigue life decreases with increasing inclusion size. With the increase of actual stress, the critical size of the inclusions induced by fatigue cracks decreases.

Key words: rotating bar bending fatigue, crack initiation, surface morphology, non-metallic inclusion

CLC Number:

TG142.71

Li Jianxin, Luo Zhiqiang, Cheng Shichao, Yang Maosheng, Sun Yong, Pang Xuedong. Fatigue performance and crack initiation of 16Cr3NiWMoVNbE gear steel[J]. Heat Treatment of Metals, 2020, 45(7): 167-172.

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