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THERMAL FATIGUE BEHAVIORS OF THREE CAST NICKEL BASE SUPERALLOYS

文献类型：期刊论文

作者Xiao Xuan2; Xu Hui1,2; Qin Xuezhi1; Guo Yongan1; Guo Jianting1; Zhou Lanzhang1
刊名ACTA METALLURGICA SINICA
出版日期2011-09-11
卷号47期号:9页码:1129-1134
关键词Ni-based superalloy thermal fatigue high-temperature oxidation crystallographic orientation microstructural evolution
ISSN号0412-1961
DOI10.3724/SP.J.1037.2011.00066
通讯作者Zhou Lanzhang(lzz@imr.ac.cn)
英文摘要Thermal fatigue (TF) behaviors of three Ni-based cast superalloys were investigated in the temperature ranges of 850, 900 and 950 degrees C to 20 degrees C, respectively. OM and SEM were used to observe the microstructures and TF cracks of the tested specimens. The results demonstrated that the main style of crack initiation is the formation, gathering and interconnecting of oxidation cavities induced by thermal stress. Carbides, gamma+gamma' eutectics and grain boundaries can promote the initiation and propagation of TF cracks. The three alloys showed different mechanisms of TF crack propagation due to the distinct chemical compositions and microstructures. The TF cracks of equiaxial IN738 alloy propagate intergranularly, while those of the directional solidification (DS) DZ444 alloy propagate along interdendritical regions. The paths of TF crack propagation of DZ445 transfer from interdendrite to crystallographic orientation with increasing temperatures, i.e. (111)< 110 >, which is the easy slip system of face centered cubic alloy. The interaction of high-temperature oxidation and thermal stress is the main fractural mechanism in TF process. Some microstructural evolution at 950 degrees C accelerates the reduction of the TF property of three alloys.
WOS研究方向Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:000297825800006
出版者SCIENCE PRESS
源URL[http://ir.imr.ac.cn/handle/321006/106587]  
专题金属研究所_中国科学院金属研究所
通讯作者Zhou Lanzhang
作者单位1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Shenyang Ligong Univ, Sch Mat Sci & Engn, Shenyang 110168, Peoples R China
推荐引用方式
GB/T 7714		 Xiao Xuan,Xu Hui,Qin Xuezhi,et al. THERMAL FATIGUE BEHAVIORS OF THREE CAST NICKEL BASE SUPERALLOYS[J]. ACTA METALLURGICA SINICA,2011,47(9):1129-1134.
APA Xiao Xuan,Xu Hui,Qin Xuezhi,Guo Yongan,Guo Jianting,&Zhou Lanzhang.(2011).THERMAL FATIGUE BEHAVIORS OF THREE CAST NICKEL BASE SUPERALLOYS.ACTA METALLURGICA SINICA,47(9),1129-1134.
MLA Xiao Xuan,et al."THERMAL FATIGUE BEHAVIORS OF THREE CAST NICKEL BASE SUPERALLOYS".ACTA METALLURGICA SINICA 47.9(2011):1129-1134.

入库方式： OAI收割

来源：金属研究所

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