The effect of cyclic loading on the creep fatigue life and creep strength of a DS superalloy: Damage mechanism and life modeling

被引：25
作者：
Hu, Xiaoan [1 ,2 ]
Zhang, Qiang [1 ,2 ]
Jiang, Yun [1 ,2 ]
Rao, GuoFeng [3 ]
Miao, GuoLei [3 ]
He, WeiFeng [4 ]
Nie, XiangFan [4 ]
机构：
[1] Nanchang Hangkong Univ, Sch Aircraft Engn, Nanchang 330063, Jiangxi, Peoples R China
[2] Jiangxi Key Lab Micro Aeroengine, Nanchang 330063, Jiangxi, Peoples R China
[3] Chengdu Holy Ind & Commerce Corp LTD, Chengdu 610011, Peoples R China
[4] Air Force Engn Univ, Sci & Technol Plasma Dynam Lab, Xian 710038, Shanxi, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2020年 / 134卷
基金：
中国国家自然科学基金;
关键词：
Superalloy; Creep-fatigue; Endurance strength; Damage evolution; Life prediction; Design boundary; NICKEL-BASED SUPERALLOY; NI-BASE SUPERALLOY; THERMOMECHANICAL FATIGUE; BEHAVIOR; PREDICTION; STEEL; ENDURANCE; DESIGN;
D O I：
10.1016/j.ijfatigue.2019.105452
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
In this paper, the creep-fatigue behavior of directionally solidified superalloy DZ125 has been investigated by stress-controlled experiments at high temperatures with different dwell times. The endurance life(Le Cumulated dwell time) has shown consistent changing trend with different load conditions. Crack growth form and creep fatigue interaction are analyzed on the basis of microscope observation results. A new continuum damage mechanics(CDM) model is proposed and the damage behavior of DZ125 under different dwell times is systematically analyzed by this new model. Secondly, a life prediction model of high precision with fully coverage of dwell time and hold stress is proposed based on material's endurance strength decline and classical Larson-Miller life prediction method. Finally, the ultimate value of endurance strength decline of the superalloy affected by cyclic loads is determined for engineering application purpose.
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页数：14
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