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Microstructural changes and their effect on tensile properties of a Ni-Fe based alloy during long-term thermal exposure
Wang, CS; Guo, YA; Guo, JT; Zhou, LZ; Zhou, LZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
2016-07-18
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume670Pages:178-187
AbstractMicrostructural changes and their effect on tensile properties of a Ni-Fe based alloy, considered as boiler materials in 700 degrees C advanced ultra-supercritical (A-USC) coal-fired power plants, were investigated during exposure at 700-800 degrees C for up to 30000 h. The results show that the major precipitates are still spherical gamma ', blocky MC and discrete particle-like M23C6 after long-term thermal exposure. No eta or sigma and other detrimental phases were observed. The main changes in microstructure are gamma ' coarsening and the precipitation and growth of M23C6 carbide. The coarsening behavior of gamma ' precipitates is in good accordance with the prediction of the Lifshitz-Slozov-Wagner (LSW) theory during exposure at 700 degrees C. However, it deviates from the prediction of LSW theory at 750 and 800 degrees C and an anomalous coarsening behavior of gamma ' precipitates was observed. For M23C6 carbide, the size and amount first increase, and then keep almost constant with increasing exposure time at 700 and 750 degrees C, but the dissolution of M23C6 carbide appears at 800 degrees C. The yield strength first increases and then slightly decreases with increasing exposure time at 700 degrees C, while it decreases gradually at 750 degrees C and decreases drastically and then keeps almost constant at 800 degrees C. However, the yield strength almost keeps the same level as that of the samples after standard heat treatment even if after exposure at 700 degrees C for 30000 h. The elongation has no obvious change with increasing exposure time at 700 and 750 degrees C, but it increases gradually at 800 degrees C. The changes in yield strength and ductility can be attributed to the gamma ' coarsening and the evolution of M23C6 carbide. (C) 2016 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 Alloy Gamma ' Precipitates M23c6 Carbide Tensile Properties
Subject AreaNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
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 [NY20150102]
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/76326
Collection中国科学院金属研究所
Corresponding AuthorZhou, LZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Wang, CS,Guo, YA,Guo, JT,et al. Microstructural changes and their effect on tensile properties of a Ni-Fe based alloy during long-term thermal exposure[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2016,670:178-187.
APA Wang, CS,Guo, YA,Guo, JT,Zhou, LZ,&Zhou, LZ .(2016).Microstructural changes and their effect on tensile properties of a Ni-Fe based alloy during long-term thermal exposure.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,670,178-187.
MLA Wang, CS,et al."Microstructural changes and their effect on tensile properties of a Ni-Fe based alloy during long-term thermal exposure".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 670(2016):178-187.
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