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The investigation of carbides evolution in a cobalt-base superalloy at elevated temperature
Gui, Weimin; Zhang, Hongyu; Yang, Min; Jin, Tao; Sun, Xiaofeng; Zheng, Qi; Zheng, Q (reprint author), Chinese Acad Sci, Superalloys Div, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China.
2017-02-25
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume695Pages:1271-1278
AbstractThe carbides evolution characteristics and mechanisms in a cobalt-base superalloy at elevated temperatures between 1140 and 1265 degrees C have been investigated to provide the basis for potential service and heat treatment of the alloy. The in-situ transformation of M7C3 -> M23C6 is observed directly, which has not been reported in previous studies of cobalt-base superalloys. M23C6 carbide nucleates at the M7C3/ matrix interface due to the coherent relationship between M23C6 carbide and the matrix, and grows towards M7C3 carbide. On the other hand, it is found that primary MC carbide degenerates and releases a large number of Ti and W. Thus, residual MC carbide exhibits increased concentration ratios for Ta and Zr and shows enhanced thermal stability. The results indicate that the degeneration behavior of MC carbide is temperature dependent: MC decomposes into M6C carbide at lower temperature and dissolves partially into the matrix at higher temperature. (C) 2016 Elsevier B.V. All rights reserved.; The carbides evolution characteristics and mechanisms in a cobalt-base superalloy at elevated temperatures between 1140 and 1265 degrees C have been investigated to provide the basis for potential service and heat treatment of the alloy. The in-situ transformation of M7C3 -> M23C6 is observed directly, which has not been reported in previous studies of cobalt-base superalloys. M23C6 carbide nucleates at the M7C3/ matrix interface due to the coherent relationship between M23C6 carbide and the matrix, and grows towards M7C3 carbide. On the other hand, it is found that primary MC carbide degenerates and releases a large number of Ti and W. Thus, residual MC carbide exhibits increased concentration ratios for Ta and Zr and shows enhanced thermal stability. The results indicate that the degeneration behavior of MC carbide is temperature dependent: MC decomposes into M6C carbide at lower temperature and dissolves partially into the matrix at higher temperature. (C) 2016 Elsevier B.V. All rights reserved.
description.department[gui, weimin ; zhang, hongyu ; jin, tao ; sun, xiaofeng ; zheng, qi] chinese acad sci, superalloys div, inst met res, 72 wenhua rd, shenyang 110016, peoples r china ; [gui, weimin] univ sci & technol china, sch mat sci & engn, hefei 230026, anhui, peoples r china ; [yang, min] northwestern polytech univ, state key lab solidificat proc, xian 710072, peoples r china
KeywordCobalt-base Superalloy M7c3 Decomposition Mc Degeneration Microstructure Heat Treatment
Subject AreaChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China [51331005, 11332010]; High Technology Research and Development Program of China [2014AA041701]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78281
Collection中国科学院金属研究所
Corresponding AuthorZheng, Q (reprint author), Chinese Acad Sci, Superalloys Div, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Gui, Weimin,Zhang, Hongyu,Yang, Min,et al. The investigation of carbides evolution in a cobalt-base superalloy at elevated temperature[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2017,695:1271-1278.
APA Gui, Weimin.,Zhang, Hongyu.,Yang, Min.,Jin, Tao.,Sun, Xiaofeng.,...&Zheng, Q .(2017).The investigation of carbides evolution in a cobalt-base superalloy at elevated temperature.JOURNAL OF ALLOYS AND COMPOUNDS,695,1271-1278.
MLA Gui, Weimin,et al."The investigation of carbides evolution in a cobalt-base superalloy at elevated temperature".JOURNAL OF ALLOYS AND COMPOUNDS 695(2017):1271-1278.
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