Effect of Co on Microstructure and Stress Rupture Properties of K4750 Alloy
文献类型：期刊论文
| 作者 | Li, Xiao-Xiao1,2; Ou, Mei-Qiong1; Wang, Min1; Hao, Xian-Chao1; Ma, Ying-Che1; Liu, Kui1 |
| 刊名 | ACTA METALLURGICA SINICA-ENGLISH LETTERS
 |
| 出版日期 | 2019-12-01 |
| 卷号 | 32期号:12页码:1501-1510 |
| ISSN号 | 1006-7191 |
| 关键词 | Nickel-based superalloy Co addition MC degradation Stress rupture property |
| DOI | 10.1007/s40195-019-00936-w |
| 通讯作者 | Ou, Mei-Qiong(mqou@imr.ac.cn) ; Ma, Ying-Che(ycma@imr.ac.cn) |
| 英文摘要 | The effects of substituting Co for Fe on the microstructure and stress rupture properties of K4750 alloy were studied. The microstructure of the alloy without Co (K4750 alloy) and the alloy containing Co (K4750-Co alloy) were analyzed. Substitution of Co for Fe inhibited the decomposition of MC carbide and the precipitation of eta phase during long-term aging treatment. In K4750-Co alloy, the morphology of MC carbide at the grain boundary (GB) remained dispersed blocky shape and no eta phase was observed after aging at 750 degrees C for 3000 h. However, in K4750 alloy, almost all the MC carbides at GBs broke down into granular M23C6 carbide and needle-like eta phase. The addition of cobalt could delay the decomposition of MC carbides, which accordingly restricted the elemental supply for the formation of eta phase. The stress rupture tests were conducted on two alloys at 750 degrees C/430 MPa. When Co is substituted for Fe in K4750 alloy, the stress rupture life increased from 164.10 to 264.67 h after standard heat treatment. This was mainly attributed to increased concentration of Al, Ti and Nb in gamma ' phase in K4750-Co alloy, which further enhanced the strengthening effect of gamma ' phase. After aging at 750 degrees C for 3000 h, substitution of Co for Fe can also cause the stress rupture life at 750 degrees C/430 MPa to increase from 48.72 to 208.18 h. The reason was mainly because MC carbide degradation and eta phase precipitation in K4750 alloy, which promoted the initiation and propagation of micro-crack during stress rupture testing. |
| WOS研究方向 | Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| 出版者 | CHINESE ACAD SCIENCES, INST METAL RESEARCH |
| WOS记录号 | WOS:000495116000007 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/137025]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Ou, Mei-Qiong; Ma, Ying-Che |
| 作者单位 | 1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Xiao-Xiao,Ou, Mei-Qiong,Wang, Min,et al. Effect of Co on Microstructure and Stress Rupture Properties of K4750 Alloy[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2019,32(12):1501-1510. |
| APA | Li, Xiao-Xiao,Ou, Mei-Qiong,Wang, Min,Hao, Xian-Chao,Ma, Ying-Che,&Liu, Kui.(2019).Effect of Co on Microstructure and Stress Rupture Properties of K4750 Alloy.ACTA METALLURGICA SINICA-ENGLISH LETTERS,32(12),1501-1510. |
| MLA | Li, Xiao-Xiao,et al."Effect of Co on Microstructure and Stress Rupture Properties of K4750 Alloy".ACTA METALLURGICA SINICA-ENGLISH LETTERS 32.12(2019):1501-1510. |
入库方式： OAI收割
来源：金属研究所
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