An Abnormal Increase of Fatigue Life with Dwell Time during Creep-Fatigue Deformation for Directionally Solidified Ni-Based Superalloy DZ445

被引:16
作者
Ding, Biao [1 ]
Ren, Weili [1 ]
Deng, Kang [1 ]
Li, Haitao [2 ,3 ]
Liang, Yongchun [4 ]
机构
[1] Shanghai Univ, Coll Mat Sci & Engn, State Key Lab Adv Special Steel, Shanghai 200072, Peoples R China
[2] South China Univ Technol, Guangzhou 510641, Guangdong, Peoples R China
[3] Guangdong Power Grid Co Ltd, Guangzhou 510600, Guangdong, Peoples R China
[4] Guangdong Power Grid Corp, Elect Power Res Inst, Guangzhou 510080, Guangdong, Peoples R China
基金
中国国家自然科学基金;
关键词
creep; fatigue; fatigue life; directionally solidified superalloy; LOW-CYCLE FATIGUE; ELEVATED-TEMPERATURE; HOLD TIME; BEHAVIOR; STEEL;
D O I
10.1515/htmp-2016-0079
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The paper investigated the creep-fatigue behavior for directionally solidified nickel-based superalloy DZ445 at 900 degrees C. It is found that the fatigue life shows an abnormal increase when the dwell time exceeds a critical value during creep-fatigue deformation. The area of hysteresis loop and fractograph explain the phenomenon quite well. The shortest life corresponds to the maximal area of hysteresis loop, i.e. the maximum energy to be consumed during the creep-fatigue cycle. The fractographic observation of failed samples further supports the abnormal behavior of fatigue life.
引用
收藏
页码:277 / 284
页数:8
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