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Healing Process of Casting Pores in a Ni-based Superalloy by Hot Isostatic Pressing

ISSN号：1005-0302
期刊名称：JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
时间：2015.7.4
页码：1151-1157
分类：TG146.15[金属学及工艺—金属材料;一般工业技术—材料科学与工程;金属学及工艺—金属学] S858.31[农业科学—临床兽医学;农业科学—兽医学;农业科学—畜牧兽医]
作者机构：[1]Shenyang National Laboratory for Materials Science, Institute of Metal Research. Chinese Academy of Sciences, Shenyang 110016, China, [2]Superalloy Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
相关基金：Acknowledgments The authors are grateful for financial support from the Ministry of Science and Technology of the People＇s Republic of China （No. 2012CB932201 ）, the National Natural Science Foundation of China （No. 51231006）, the International Cooperation Program funded by National Natural Science Foundation of China （No. 51261130091） and the Key Research Program of Chinese Academy of Sciences （No. KGZD-EW-T06）.
相关项目：纳米金属：跨尺度的结构性能研究

关键词：铸造镍基高温合金, 愈合过程, 热等静压, 合金铸件, 铸造过程, 扫描电镜, 涡轮增压器, 光学显微镜, Superalloy Hot isostatic pressing （HIP） Healing

中文摘要：

(臀部) 热均衡说的紧迫与在 1170 °C 的温度的 180 MPa 的一个压力被介绍给探索扔毛孔的愈合的过程的基于 Ni 的 superalloy (M91 ) turbocharger 片在投资扔期间产生了的一个投资演员组。光显微图和扫描电子显微镜学(SEM ) 观察显示最容易溶解的毛孔是在当演员组片的主要演员组缺点以前新潮。这些毛孔通常在 /′ 的团结前面定位与到一些十测微计的一些测微计的一种尺寸最容易溶解。在为 4 h 的臀部以后，大多数毛孔被关上。基于阶段特征，这些毛孔被矩阵的形成与更好、不规则形状的 ′ 愈合猛抛。愈合的接口能被 SEM 容易区分。在愈合的高得多的 Ti 和艾尔集中连接的由使用散 X 光检查光谱学(版本) 揭示的精力的线扫描。向扔的毛孔的溶质散开在臀部期间导致形成，这被建议，并且愈合的接口附近的 ′-forming 元素艾尔和 Ti 的高得多的集中贡献 ′ 的降水在在成功在臀部以后使过程凉下来的愈合的区域。

英文摘要：

Hot isostatic pressing （HIP） with a pressure of 180 MPa at a temperature of 1170 ℃ was introduced to an investment cast Ni-based superalloy （Mgl） turbocharger blade to explore the healing process of casting pores generated during investment casting. Optical micrograph and scanning electron naicroscopy （SEM） observations indicate that eutectic pores are the main cast defects in the as-cast blade before HIP. These pores normally locate at the solidification front of γ/γ＇ eutectic with a size of a few micrometers to a few tens of micrometers. After HIP for 4 h, most of the pores were closed. Based on phase characteristics, these pores were healed by the formation of γ matrix with finer and irregular-shaped γ＇ precipitates. Healing interface can be easily distinguished by SEM. Line scan by using energy dispersive X-ray spectroscopy （EDS） reveals a much higher Ti and Al concentration in the healing interface. It is proposed that solute diffusion toward the casting pores during HIP results in the formation of γ, and the much higher concentration of γ＇-forming elements Al and Ti near the healing interface contributes to the precipitation of γ＇ in the healed region in the succeeding cooling process after HIP.