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Influence of type and morphology of carbides on stress-rupture behavior of a cast cobalt-base superalloy
Gui, Weimin; Zhang, Hongyu; Yang, Min; Jin, Tao; Sun, Xiaofeng; Zheng, Qi; Zheng, Q (reprint author), Chinese Acad Sci, Inst Met Res, Superalloys Div, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China.
2017-12-25
Source PublicationELSEVIER SCIENCE SA
ISSN0925-8388
Volume728Pages:145-151
AbstractThe relationships between the type and morphology of carbides and stress-rupture property have been studied in a cast cobalt-base superalloy. Different types and morphologies of carbides are achieved by varying the heat treatment conditions. After heat treatment at 1240 degrees C/4 h, the primary M7C3 decomposes into M23C6, and the formed M23C6 and primary MC partially dissolve into the matrix. After heat treatment at 1280 degrees C/4 h, the primary M7C3 melts, resulting in the formation of a highly developed lamellar structure of M23C6, and the primary MC mostly dissolves into the matrix. The heat treatment at 1100 degrees C/300 h gives rise to the carbide transformation of M7C3 -> M23C6 and a profusion of secondary M23C6 carbide around M23C6 and MC. The samples in stress-rupture test at 980 degrees C for 83 MPa manifest the following rupture life: 1280 degrees C sample > 1240 degrees C sample > as-cast sample > 1100 degrees C sample. The longer rupture life of the samples of 1240 degrees C and 1280 degrees C is derived from the stable microstructure, dispersed MC carbide morphology and the supersaturated matrix. The shortest rupture life of the 1100 degrees C sample is mainly attributed to the overaging. Additionally, the carbide transformations of M7C3 -> M23C6, MC -> M23C6, M23C6 -> M6C take place in the as-cast sample during creep exposure. (C) 2017 Elsevier B.V. All rights reserved.; The relationships between the type and morphology of carbides and stress-rupture property have been studied in a cast cobalt-base superalloy. Different types and morphologies of carbides are achieved by varying the heat treatment conditions. After heat treatment at 1240 degrees C/4 h, the primary M7C3 decomposes into M23C6, and the formed M23C6 and primary MC partially dissolve into the matrix. After heat treatment at 1280 degrees C/4 h, the primary M7C3 melts, resulting in the formation of a highly developed lamellar structure of M23C6, and the primary MC mostly dissolves into the matrix. The heat treatment at 1100 degrees C/300 h gives rise to the carbide transformation of M7C3 -> M23C6 and a profusion of secondary M23C6 carbide around M23C6 and MC. The samples in stress-rupture test at 980 degrees C for 83 MPa manifest the following rupture life: 1280 degrees C sample > 1240 degrees C sample > as-cast sample > 1100 degrees C sample. The longer rupture life of the samples of 1240 degrees C and 1280 degrees C is derived from the stable microstructure, dispersed MC carbide morphology and the supersaturated matrix. The shortest rupture life of the 1100 degrees C sample is mainly attributed to the overaging. Additionally, the carbide transformations of M7C3 -> M23C6, MC -> M23C6, M23C6 -> M6C take place in the as-cast sample during creep exposure. (C) 2017 Elsevier B.V. All rights reserved.
description.department[gui, weimin ; zhang, hongyu ; jin, tao ; sun, xiaofeng ; zheng, qi] chinese acad sci, inst met res, superalloys div, 72 wenhua rd, shenyang 110016, liaoning, 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, shaanxi, peoples r china
KeywordCobalt-base Superalloy Heat Treatment Stress-rupture Carbide Phase Transformation
Subject AreaChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China [51331005, 51601192, 51671188, 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/321006/78926
Collection中国科学院金属研究所
Corresponding AuthorZheng, Q (reprint author), Chinese Acad Sci, Inst Met Res, Superalloys Div, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
GB/T 7714
Gui, Weimin,Zhang, Hongyu,Yang, Min,et al. Influence of type and morphology of carbides on stress-rupture behavior of a cast cobalt-base superalloy[J]. ELSEVIER SCIENCE SA,2017,728:145-151.
APA Gui, Weimin.,Zhang, Hongyu.,Yang, Min.,Jin, Tao.,Sun, Xiaofeng.,...&Zheng, Q .(2017).Influence of type and morphology of carbides on stress-rupture behavior of a cast cobalt-base superalloy.ELSEVIER SCIENCE SA,728,145-151.
MLA Gui, Weimin,et al."Influence of type and morphology of carbides on stress-rupture behavior of a cast cobalt-base superalloy".ELSEVIER SCIENCE SA 728(2017):145-151.
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