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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
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume639Pages:380-388
AbstractNi-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.
description.department[wang, changshuai ; guo, yongan ; guo, jianting ; zhou, lanzhang] chinese acad sci, inst met res, shenyang 110016, peoples r china
KeywordNi-fe Based Superalloy Microstructural Stability Mechanical Properties Boron 700 Degrees c A-usc
Funding OrganizationNational 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
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/74972
Collection中国科学院金属研究所
Corresponding Authorcswang@imr.ac.cn; lzz@imr.ac.cn
Recommended Citation
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.
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