| THERMAL FATIGUE BEHAVIORS OF THREE CAST NICKEL BASE SUPERALLOYS | |
| Xiao Xuan2; Xu Hui1,2; Qin Xuezhi1; Guo Yongan1; Guo Jianting1; Zhou Lanzhang1 | |
| 通讯作者 | Zhou Lanzhang(lzz@imr.ac.cn) |
| 2011-09-11 | |
| 发表期刊 | ACTA METALLURGICA SINICA
 |
| ISSN | 0412-1961 |
| 卷号 | 47期号:9页码:1129-1134 |
| 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. |
| 关键词 | Ni-based superalloy thermal fatigue high-temperature oxidation crystallographic orientation microstructural evolution |
| DOI | 10.3724/SP.J.1037.2011.00066 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Metallurgy & Metallurgical Engineering |
| WOS类目 | Metallurgy & Metallurgical Engineering |
| WOS记录号 | WOS:000297825800006 |
| 出版者 | SCIENCE PRESS |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.imr.ac.cn/handle/321006/106588 |
| 专题 | 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. |
| 条目包含的文件 | 条目无相关文件。 | |||||
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