Low cycle fatigue behavior and fracture characteristics of tap changer main drive shaft

doi:10.13251/j.issn.0254-6051.2022.12.044

Abstract

Abstract: Low cycle fatigue properties and fracture characteristics of the main drive shaft of tap changer were systematically studied. The results show that the fatigue life of the EN-GJS-700-2 ductile iron strongly depends on the applied cyclic strain amplitude. It is further found that the fatigue life mainly depends on the plastic component in the cyclic strain amplitude, so that the fatigue life and the total cyclic strain amplitude satisfy the Coffin-Manson equation. SEM fracture morphology shows that the spheroidal graphite/pearlite interface on the surface of ductile iron is the preferred initiation position of fatigue cracks under low or high strain amplitude, and presents multi-source characteristics. In the subsequent crack propagation process, the high strain amplitude fracture is flat, the cleavage fracture characteristics are obvious, and it is difficult to observe the fatigue stripes. However, at low strain amplitude, the spherical graphite and pearlite significantly participate in plastic deformation, and the fatigue stripes become obvious.

Key words: ductile iron, low cycle fatigue, fatigue life, fracture analysis

CLC Number:

TG146.2

Zhou Xuan, Huang Yao, Yang Fan, Zhao Dingxuan, Li Keer, Yu Guoxiang, Chen Wei, Cai Heping. Low cycle fatigue behavior and fracture characteristics of tap changer main drive shaft[J]. Heat Treatment of Metals, 2022, 47(12): 269-274.

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