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THERMAL FATIGUE BEHAVIORS OF THREE CAST NICKEL BASE SUPERALLOYS
Xiao Xuan2; Xu Hui1,2; Qin Xuezhi1; Guo Yongan1; Guo Jianting1; Zhou Lanzhang1
Corresponding AuthorZhou Lanzhang(lzz@imr.ac.cn)
2011-09-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume47Issue:9Pages:1129-1134
AbstractThermal 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.
KeywordNi-based superalloy thermal fatigue high-temperature oxidation crystallographic orientation microstructural evolution
DOI10.3724/SP.J.1037.2011.00066
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000297825800006
PublisherSCIENCE PRESS
Citation statistics
Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/106588
Collection中国科学院金属研究所
Corresponding AuthorZhou Lanzhang
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Shenyang Ligong Univ, Sch Mat Sci & Engn, Shenyang 110168, Peoples R China
Recommended Citation
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.
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