Journal
MATERIALS LETTERS
Volume 241, Issue -, Pages 210-213Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2019.01.066
Keywords
Metals and alloys; Ni-based single crystal superalloy; Microstructure; Mo:W ratio; gamma&PRIME precipitates; Coarsening rate
Funding
- National Key Research and Development Program of China [2016YFB0700300]
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China
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The phase stability of gamma' precipitates in single crystal Ni-based superalloys at the elevated temperature is inherently associated with creep performance. During high temperature in-service exposure, the coarsening of gamma' precipitates typically occurs and further results in coalescing that is regarded as an indicator of degradation of creep resistance. In this research, we design three single crystal Ni-based superalloys by means of solely tuning Mo:W ratio to investigate their coarsening behaviors upon different temperatures (950-1050 degrees C) and exposure times (0-500 h). The experimental results showed that the coarsening rate of gamma' precipitates increases with increasing Mo:W ratio. The coarsening kinetics are adequately characterised by the classical LSEM model. The experimental results can be used to optimize the design of alloy chemistry. (C) 2019 Elsevier B.V. All rights reserved.
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