MICROSTRUCTURE AND MICROSEGREGATION IN A Ni-BASED SINGLE CRYSTAL SUPERALLOY DIRECTIONALLY SOLIDIFIED UNDER HIGH THERMAL GRADIENT
文献类型：期刊论文
| 作者 | Liu Gang2; Liu Lin2; Zhao Xinbao2; Zhang Weiguo2; Jin Tao1; Zhang Jun2; Fu Hengzhi2 |
| 刊名 | ACTA METALLURGICA SINICA
 |
| 出版日期 | 2010-01-11 |
| 卷号 | 46期号:1页码:77-83 |
| 关键词 | Ni-based single crystal superalloy high thermal gradient microsegregation microstructure |
| ISSN号 | 0412-1961 |
| DOI | 10.3724/SP.J.1037.2009.00419 |
| 通讯作者 | Liu Gang(muchengliu@126.com) |
| 英文摘要 | In order to understand the effect of high thermal gradient on the microsegregation of refractory elements in Ni-based superalloys, a Ni-based single crystal superalloy containing 4% Re (mass fraction) was prepared by dual heating zone melting and liquid-metal cooling (LMC) directional solidification technique. Comparing with the traditional high rate solidification (HRS) method with thermal gradient G=20-40 K/cm, withdrawal rate V=50-100 mu m/s and primary dendritic arm spacing lambda(1)=200-400 mu m, this technique can significantly increase the thermal gradient (up to 238 K/cm) and withdrawal rates (up to 500 mu m/s). Planar-like and cellular-like solid-liquid interfaces, coarse dendrite and fine dendrite were sequentially obtained with increasing withdrawal rates. Under the condition of G=238 K/cm and V=500 mu m/s, the primary dendritic arm spacing lambda(1) and the mean size of gamma' precipitates (in dendrite core) obviously decreased to 61.3 and 0.04 mu m, respectively. In addition, the microsegregation increased initially and then decreased with increasing withdrawal rate, especially for the microsegregations of W and Re. EPMA line scan indicated that solid-back diffusion has an obvious influence on the microsegregation for the fine dendrite structure under high thermal gradient directional solidification. |
| 资助项目 | National Natural Science Foundation of China[50771081] ; National Natural Science Foundation of China[50827102] ; National High Technical Research and Development Program of China[2007AA03Z552] |
| WOS研究方向 | Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000274823200013 |
| 出版者 | SCIENCE PRESS |
| 资助机构 | National Natural Science Foundation of China ; National High Technical Research and Development Program of China |
| 源URL | [http://ir.imr.ac.cn/handle/321006/101011]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Liu Gang |
| 作者单位 | 1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.NW Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu Gang,Liu Lin,Zhao Xinbao,et al. MICROSTRUCTURE AND MICROSEGREGATION IN A Ni-BASED SINGLE CRYSTAL SUPERALLOY DIRECTIONALLY SOLIDIFIED UNDER HIGH THERMAL GRADIENT[J]. ACTA METALLURGICA SINICA,2010,46(1):77-83. |
| APA | Liu Gang.,Liu Lin.,Zhao Xinbao.,Zhang Weiguo.,Jin Tao.,...&Fu Hengzhi.(2010).MICROSTRUCTURE AND MICROSEGREGATION IN A Ni-BASED SINGLE CRYSTAL SUPERALLOY DIRECTIONALLY SOLIDIFIED UNDER HIGH THERMAL GRADIENT.ACTA METALLURGICA SINICA,46(1),77-83. |
| MLA | Liu Gang,et al."MICROSTRUCTURE AND MICROSEGREGATION IN A Ni-BASED SINGLE CRYSTAL SUPERALLOY DIRECTIONALLY SOLIDIFIED UNDER HIGH THERMAL GRADIENT".ACTA METALLURGICA SINICA 46.1(2010):77-83. |
入库方式： OAI收割
来源：金属研究所
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