Low Cycle Fatigue Characteristics of a Ni-Based Single Crystal Superalloy CMSX-4 at Elevated Temperature

2019 ◽  
Vol 36 (3) ◽  
pp. 271-279
Author(s):  
Jae Gu Choi ◽  
Chang-Sung Seok ◽  
Sung Uk Wee ◽  
Eui-Suck Chung ◽  
Byoung-Gwan Yun ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Single Crystal ◽  
Low Cycle Fatigue ◽  
Single Crystal Superalloy ◽  
Cycle Fatigue ◽  
Fatigue Characteristics

High Temperature Multiaxial Low Cycle Fatigue of CMSX-2 NI-Base Single Crystal Superalloy

1997 ◽  
Vol 119 (2) ◽  
pp. 153-160 ◽  
Author(s):  
Mitsuru Kanda ◽  
Masao Sakane ◽  
Masateru Ohnami ◽  
Tadashi Hasebe
Keyword(s):  
Single Crystal ◽  
Low Cycle Fatigue ◽  
Crack Opening ◽  
Equivalent Stress ◽  
Equivalent Strain ◽  
Fatigue Tests ◽  
Single Crystal Superalloy ◽  
Cycle Fatigue ◽  
Data Correlation ◽  
Opening Displacement

This paper describes studies of the tension-torsion multiaxial low cycle fatigue of CMSX-2 Ni-base single crystal superalloy. Tension-torsion low cycle fatigue tests were carried out at 1173K using CMSX-2 hollow cylinder specimens aligned with the {001} axis. Several multiaxial strain and stress parameters were applied to the experimental data to examine the suitability of the parameters to life prediction. All the strain parameters proposed so far gave a large scatter of the data correlation. Discrepant data correlation with the strain parameters resulted from the anisotropic stress response due to the crystallographic texture. Larger Mises equivalent stress was applied in torsion tests than in tension tests at the same Mises strain. However, Mises stress and the equivalent stress based on crack opening displacement gave a satisfactory data correlation. This study developed a new equivalent strain, taking account of the anisotropy of the elastic constants, which correlates the multiaxial low cycle fatigue data with a small scatter.

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