The Study on the Fatigue Crack Growth of Nickel Based Directional Solidification Superalloys DZ125

doi:10.3901/JME.2019.13.045

Abstract

Abstract: The nickel based directional solidification superalloys DZ125 is chosen as the study object. The compact tension (CT) specimens are used and the fatigue crack growth experiments are conducted at room temperature and high temperature (760℃ and 850℃)respectively based on the unloading compliance method according to the ASTM-E647 standard. The influence of temperature and material orientation on fatigue crack growth rate are mainly investigated. The test results show that:elevated temperature increases the crack growth rate significantly, while the influence of material orientation on the rate is limited at elevated temperature. Meanwhile high temperature results in the deflection in some of the specimens, which means the crack growth path was not perpendicular to the loading direction. Finally, combined with the Paris propagation model, the relationship of coefficient C and exponent m between the temperature were established by regressing the corresponding results to further discuss the temperature and orientation effect.

Key words: compliance method, crack growth rate, directional solidification superalloys, fatigue, high temperature

CLC Number:

V231

SHI Yi, YANG Xiaoguang, YANG Didi, MIAO Guolei, SHI Duoqi. The Study on the Fatigue Crack Growth of Nickel Based Directional Solidification Superalloys DZ125[J]. Journal of Mechanical Engineering, 2019, 55(13): 45-52.

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