Microstructure and Solidification Characteristics and Segregation Behavior of Superalloy K4169

被引：5
|
作者：
Li, Xiaoliang [1 ,2 ]
Chen, Bo [1 ]
Xing, Weiwei [1 ]
Zhang, Long [1 ]
Ma, Yingche [1 ]
Liu, Kui [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China
来源：
HIGH PERFORMANCE STRUCTURAL MATERIALS | 2018年
关键词：
K4169; alloy; Isothermal solidification; Elemental segregation; Laves phase;
D O I：
10.1007/978-981-13-0104-9_62
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The solidification process and segregation feature of K4169 alloy is studied by DSC, Thermo-Calc simulation and isothermal solidification analyses. The segregation and precipitation behavior of superalloy K4169 during isothermal solidification at 1360 and 1120 degrees C have been observed by the means of optical microscopy (OM), electron probe microanalysis (EPMA), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The results stated that the solidification began with the formation of primary gamma dendrites, and accompanied by the formation of MC carbides. During the solidification, Nb, Mo and Ti were enriched in the residual liquid phase, which eventually lid to the formation of MC carbides and Laves phases. The liquidus of K4169 was 1354 degrees C, and the solidus was 1240 degrees C. Its solidification sequence can be identified as follows: L -> gamma at 1354 degrees C; L -> gamma + MC at 1290 degrees C; L -> gamma + Laves at 1120 degrees C.
引用
收藏
页码：587 / 598
页数：12
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