Thermal stability of primary carbides and carbonitrides in two cast Ni-base superalloys

被引：30
作者：
Qin, X. Z. [1 ]
Guo, J. T. [1 ]
Yuan, C. [1 ]
Hou, J. S. [1 ]
Ye, H. Q. [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
来源：
MATERIALS LETTERS | 2008年 / 62卷 / 16期
关键词：
Ni-base superalloy; thermal exposure; microstructure; carbide; carbonitride;
D O I：
10.1016/j.matlet.2007.11.068
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Thermal stability of primary MC carbide and M(CN) carbonitride in K452 and K446 alloys is investigated. In K452 alloy, primary MC is very unstable relative to M(CN) for the former contains a higher content of the weakeners (Wand Mo) than the latter. The ratios of element contents (at.%) (W + Mo)/Cr, (W + Mo)/(Ti + Nb) and Nb/Ti are three important parameters, which together determine the thermal stability of primary MC. Also, primary MC degeneration plays an important role in the microstructural instability of K452 and K446 alloys. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：2275 / 2278
页数：4
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