Fatigue Fracture Behavior of K4169 Alloy Casting at Room Temperature

Abstract

Abstract: The fatigue properties of the specimens cutting from the characteristic structure of the K4169 heavy investment casting were tested at room temperature. The mechanism of fatigue fracture was studied by combinational fracture analysis and temperature field simulation of solidification process. The results reveal that the structure of the casting has significant influence on the fatigue life. The fatigue failure of specimens is related to the content and distribution of the microporosity. A less microporosity leads to a well fatigue performance, and vice versa. The fatigue crack propagates along the interdentric Laves phase and carbide with low content of microporosity. However, the crack mainly accelerates through microporosity capturing with high content of microporosity, which leads to earlier failure of the specimen.

Key words: K4169 alloy, fatigue fracture, microporosity defect, simulation

KANG Mao-Dong, GAO Hai-Yan, WANG Jun, LING Li-Shi-Bao, SUN Bao-De. Fatigue Fracture Behavior of K4169 Alloy Casting at Room Temperature[J]. Journal of Shanghai Jiaotong University, 2012, 46(09): 1461-1465.

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