Microstructural stability and mechanical properties of a boron modified Ni-Fe based superalloy for steam boiler applications

IMR OpenIR

	Microstructural stability and mechanical properties of a boron modified Ni-Fe based superalloy for steam boiler applications
	Wang, Changshuai; Guo, YongAn; Guo, Jianting; Zhou, Lanzhang; cswang@imr.ac.cn; lzz@imr.ac.cn
	2015
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	639 页码:380-388
摘要	Ni-Fe based superalloys are being considered as boiler materials in 700 degrees C advanced ultra-supercritical (A-U5C) coal fired power plants due to their excellent oxidation and hot corrosion resistance, outstanding workability and low cost. In this paper, the microstructural stability and mechanical properties of a boron (B) modified Ni-Fe based superalloy designed for 700 degrees C A-USC during thermal exposure at 650-750 degrees C for up to 5000 h were investigated. The results show that adding boron has no apparent influence on the major precipitates, including spherical gamma' and blocky MC. However, the amount of M23C6 decreases markedly after standard heat treatment. During long-term thermal exposure, the addition of boron has no influence on gamma' coarsening, phase precipitation and primary MC degeneration, but decreases the growth rate of M23C6 along grain boundary. The stress rupture life and ductility are obviously improved after the addition of B. Meanwhile, the yield strength of B-doped alloy almost keeps the same level as that without boron addition. The fracture surface characterization exhibits that the dimples increase significantly after adding boron. During long-term thermal exposure, the elongation of the alloy with B addition increases slightly, but, for the alloy without B addition, the elongation obviously increases. The improvement of the stress rupture life and ductility can be attributed to the increase of grain boundary strength and the optimization of M23C6 carbide distribution at grain boundary. (C) 2015 Elsevier B.V. All rights reserved.
部门归属	[wang, changshuai ; guo, yongan ; guo, jianting ; zhou, lanzhang] chinese acad sci, inst met res, shenyang 110016, peoples r china
关键词	Ni-fe Based Superalloy Microstructural Stability Mechanical Properties Boron 700 Degrees c A-usc
资助者	National High Technology Research and Development Program of China (863 Program) [2012AA03A501]; National Natural Science Foundation of China [51301171]; National Energy Administration Program of China [NY20110102-1]; Chinese Academy of Sciences; Sichuan Province Cooperation Program
收录类别	sci
语种	英语
WOS记录号	WOS:000357549200050
引用统计	被引频次：48[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/74972
专题	中国科学院金属研究所
通讯作者	cswang@imr.ac.cn; lzz@imr.ac.cn
推荐引用方式 GB/T 7714	Wang, Changshuai,Guo, YongAn,Guo, Jianting,et al. Microstructural stability and mechanical properties of a boron modified Ni-Fe based superalloy for steam boiler applications[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2015,639:380-388.
APA	Wang, Changshuai,Guo, YongAn,Guo, Jianting,Zhou, Lanzhang,cswang@imr.ac.cn,&lzz@imr.ac.cn.(2015).Microstructural stability and mechanical properties of a boron modified Ni-Fe based superalloy for steam boiler applications.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,639,380-388.
MLA	Wang, Changshuai,et al."Microstructural stability and mechanical properties of a boron modified Ni-Fe based superalloy for steam boiler applications".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 639(2015):380-388.