Hold-Time Effects in High-Temperature Low-Cycle Fatigue: A Literature Survey and Interpretive Report

1971 ◽  
Keyword(s):  
High Temperature ◽  
Low Cycle Fatigue ◽  
Hold Time ◽  
Literature Survey ◽  
Cycle Fatigue ◽  
Time Effects

Hold time effects on low cycle fatigue behavior of HAYNES 230® superalloy at high temperatures

2005 ◽  
Vol 409 (1-2) ◽  
pp. 282-291 ◽  
Author(s):  
Y.L. Lu ◽  
L.J. Chen ◽  
G.Y. Wang ◽  
M.L. Benson ◽  
P.K. Liaw ◽  
...  
Keyword(s):  
High Temperatures ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Hold Time ◽  
Cycle Fatigue ◽  
Time Effects ◽  
Haynes 230

Low Cycle Fatigue and Creep-Fatigue Behavior of Alloy 617 at High Temperature

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
Celine Cabet ◽  
Laura Carroll ◽  
Richard Wright
Keyword(s):  
High Temperature ◽  
Fatigue Testing ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Dominant Role ◽  
Hold Time ◽  
Outlet Temperature ◽  
Cycle Fatigue ◽  
Alloy 617 ◽  
Creep Fatigue

Alloy 617 is the leading candidate material for an intermediate heat exchanger (IHX) application of the very high temperature nuclear reactor (VHTR), expected to have an outlet temperature as high as 950 °C. Acceptance of Alloy 617 in Section III of the ASME Code for nuclear construction requires a detailed understanding of the creep-fatigue behavior. Initial creep-fatigue work on Alloy 617 suggests a more dominant role of environment with increasing temperature and/or hold times evidenced through changes in creep-fatigue crack growth mechanisms and failure life. Continuous cycle fatigue and creep-fatigue testing of Alloy 617 was conducted at 950 °C and 0.3% and 0.6% total strain in air to simulate damage modes expected in a VHTR application. Continuous cycle fatigue specimens exhibited transgranular cracking. Intergranular cracking was observed in the creep-fatigue specimens and the addition of a hold time at peak tensile strain degraded the cycle life. This suggests that creep-fatigue interaction occurs and that the environment may be partially responsible for accelerating failure.

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