On damage mechanism and life prediction of ther mo-mechanical fatigue of Nickel based super alloy K417
Both in-phase (IP) and out-of-phase (OP) thermomechanical fatigue (TMF) behavior of nickel based superalloy K417 were investigated in the temperature range from 400 to 850°C. The experimental results show that for the tested materials, a tensile (positive) mean stress in OP TMF and a compressive (negative) mean stress in IP TMF was observed, and TMF life is much shorter than IF life. IP TMF leads to much reduced fatigue lives than OP TMF. The fractography reveals a different crack initiation and propagation mode for IP and OP TMF. For cast superalloy K417, intergranular fracture under IP TMF leads to the decrease in fatigue life. A life prediction model based on the fracture mechanics is used for TMF life prediction. The parameter AWt which is developed from the J integral is found to be suitable for the life prediction of TMF.
Damage mechanism Life prediction Thermo-mechanical fatigue (TMF) Nickel based superalloy K417
F. Liu Z. G. Wang S. H. Ai S. W. Nam
School of Mechanical Engineering, Liaoning Shihua University, Fushun, 113001, China National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology,
国际会议
2012 International Symposium on Structural Integrity 2012国际结构完整性学术研讨会 ISSI 2012
济南
英文
329-334
2012-10-31（万方平台首次上网日期，不代表论文的发表时间）