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题名: Influence of type and morphology of carbides on stress-rupture behavior of a cast cobalt-base superalloy
作者: Gui, Weimin;  Zhang, Hongyu;  Yang, Min;  Jin, Tao;  Sun, Xiaofeng;  Zheng, Qi
发表日期: 2017-12-25
摘要: 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.
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Recommended Citation:
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.

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