Prediction of low-cycle crack initiation life of powder superalloy FGH96 with inclusions based on damage mechanics

The effects of inclusions in powder superalloy FGH96 on low-cycle fatigue life were studied, and a low-cycle crack initiation life prediction model based on the theory of damage mechanics was proposed. The damage characterization parameter was proposed after the construction of damage evolution equa...

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Bibliographic Details
Published inTransactions of Nonferrous Metals Society of China Vol. 32; no. 3; pp. 895 - 907
Main Authors XU, Yuan-ming, ZHANG, Shu-ming, HE, Tian-peng, LIU, Xin-ling, CHANG, Xia-yuan
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.03.2022
Subjects
crack initiation life prediction
damage mechanics
inclusion
low-cycle fatigue
powder superalloy FGH96
inclusion
low-cycle fatigue
crack initiation life prediction
powder superalloy FGH96
damage mechanics
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Summary:The effects of inclusions in powder superalloy FGH96 on low-cycle fatigue life were studied, and a low-cycle crack initiation life prediction model based on the theory of damage mechanics was proposed. The damage characterization parameter was proposed after the construction of damage evolution equations. Fatigue tests of the powder superalloy specimens with and without inclusion were conducted at 530 and 600 °C, and the model verification was carried out for specimens with elliptical, semi-elliptical, polygon and strip-shaped surface/subsurface inclusion. The stress analysis was performed by finite element simulation and the predicted life was calculated. The results showed a satisfying agreement between predicted and experimental life.
ISSN:1003-6326
DOI:10.1016/S1003-6326(22)65845-X