TY - JOUR
T1 - The Influence of Dwell Time on Low Cycle Fatigue Behavior of Ni-base Superalloy IC10
AU - Wang, Anqiang
AU - Liu, Lu
AU - Wen, Zhixun
AU - Li, Zhenwei
AU - Yue, Zhufeng
N1 - Publisher Copyright:
© 2017 Walter de Gruyter GmbH, Berlin/Boston 2017.
PY - 2017/9/26
Y1 - 2017/9/26
N2 - Low cycle fatigue and creep-fatigue experiments of IC10 Ni-base superalloy plate specimens with multiple holes were performed below 1,000 °C. The average fatigue life is 105.4 cycles, while the creep-fatigue life is 103.4 cycles, which shows that the life of creep-fatigue is reduced 1-2 times compared with low cycle fatigue life. After tests, the detailed fracture and microscopic structure evolution were observed by scanning electron microscopy (SEM); meanwhile, the constitutive model based on crystal plasticity theory was established and the fracture mechanism was analyzed. Three conclusions have been obtained: First, the load during dwell time leads to the damage accumulation caused by deformation and the interaction of fatigue and creep shortens the service life of materials seriously. Second, in order to maintain the macroscopic deformation, a new slip plane starts to makes the dislocation slide in reverse direction, which leads to fatigue damage and initial cracks. Third, the inner free surface creates opportunities for escape of the dislocation line, which is caused by the cavity. What's more, the cure dislocation generated by cyclic loading contributes to the formation and growth of cavities.
AB - Low cycle fatigue and creep-fatigue experiments of IC10 Ni-base superalloy plate specimens with multiple holes were performed below 1,000 °C. The average fatigue life is 105.4 cycles, while the creep-fatigue life is 103.4 cycles, which shows that the life of creep-fatigue is reduced 1-2 times compared with low cycle fatigue life. After tests, the detailed fracture and microscopic structure evolution were observed by scanning electron microscopy (SEM); meanwhile, the constitutive model based on crystal plasticity theory was established and the fracture mechanism was analyzed. Three conclusions have been obtained: First, the load during dwell time leads to the damage accumulation caused by deformation and the interaction of fatigue and creep shortens the service life of materials seriously. Second, in order to maintain the macroscopic deformation, a new slip plane starts to makes the dislocation slide in reverse direction, which leads to fatigue damage and initial cracks. Third, the inner free surface creates opportunities for escape of the dislocation line, which is caused by the cavity. What's more, the cure dislocation generated by cyclic loading contributes to the formation and growth of cavities.
KW - crystal plasticity
KW - low cycle fatigue
KW - microstructure
UR - http://www.scopus.com/inward/record.url?scp=85029722795&partnerID=8YFLogxK
U2 - 10.1515/htmp-2016-0019
DO - 10.1515/htmp-2016-0019
M3 - 文章
AN - SCOPUS:85029722795
SN - 0334-6455
VL - 36
SP - 795
EP - 803
JO - High Temperature Materials and Processes
JF - High Temperature Materials and Processes
IS - 8
ER -