The eutectic characteristic of MC-type carbide precipitation in a DS nickel-base superalloy
文献类型：期刊论文
| 作者 | W. R. Sun ; J. H. Lee ; S. M. Seo ; S. J. Choe ; Z. Q. Hu |
| 刊名 | Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
 |
| 出版日期 | 1999 |
| 卷号 | 271期号:1-2页码:143-149 |
| 关键词 | carbide precipitation superalloy directional solidification |
| ISSN号 | 0921-5093 |
| 中文摘要 | The precipitation of MC-type carbide in a DS nickel-base superalloy has been studied. The nucleating temperature of the MC carbide was determined by analysis. The MC carbide and gamma phase were complementary in composition, and the eutectic reaction of (gamma + MC) took place in different forms at varied solidification rate. The (gamma + MC) eutectic reaction was an important factor of determining the carbide morphology. At an extremely high solidification rate, such as quenching, the compositional ranges for the (gamma + MC) eutectic reaction was broadened and the carbide precipitated through the quasi-eutectic reaction of (gamma + MG). As a result, the carbide appearing frequency was increased noticeably The dendrites of the quasi-eutectic carbide formed in quenching paralleled to each other closely for facilitating diffusion between the two eutectic components of carbide and gamma phase. The script carbide precipitated at a relatively high drawing rate around 50 mu m/s. At this rate, diffusion was insufficient and the eutectic reaction of (gamma + MC) was suppressed at most. The carbide grew quickly along the interdendritic liquid passages due to the high degree of segregation of carbide forming elements there, and hence formed a very complicated dendritic structure. The faceted carbides precipitated when the drawing rate was lower than 5 mu m/s, and some of them contained a gamma phase core. The incorporation of gamma phase into the carbide body was caused by the eutectic reaction of (gamma + MC) in the midst of the carbide precipitation. Two forms of the (gamma + MC) eutectic reaction were favored by sufficient diffusion at 0.5 mu m/s drawing rate. The (gamma + MC) eutectic reaction took place at the final stage of the carbide precipitation in an isolated liquid pool and formed small ridges distributed uniformly on the carbide surface. Diffusion operated sufficiently throughout the whole residual liquid passage guaranteed the continual eutectic reaction by a sandwich like mode of gamma/MC/gamma, and the extremely long carbide was formed along the grain boundaries as a result. (C) 1999 Elsevier Science S.A. All rights reserved. |
| 原文出处 | |
| 公开日期 | 2012-04-14 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/37495]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | W. R. Sun,J. H. Lee,S. M. Seo,et al. The eutectic characteristic of MC-type carbide precipitation in a DS nickel-base superalloy[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,1999,271(1-2):143-149. |
| APA | W. R. Sun,J. H. Lee,S. M. Seo,S. J. Choe,&Z. Q. Hu.(1999).The eutectic characteristic of MC-type carbide precipitation in a DS nickel-base superalloy.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,271(1-2),143-149. |
| MLA | W. R. Sun,et al."The eutectic characteristic of MC-type carbide precipitation in a DS nickel-base superalloy".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 271.1-2(1999):143-149. |
入库方式： OAI收割
来源：金属研究所
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