標題: High temperature creep properties of directionally solidified CM-247LC Ni-based superalloy
作者: Chiou, Mau-Sheng
Jian, Sheng-Rui
Yeh, An-Chou
Kuo, Chen-Ming
Juang, Jenh-Yih
電子物理學系
Department of Electrophysics
關鍵字: Ni-based superalloys;High-temperature creep;Cooling rates;TEM
公開日期: 8-Feb-2016
摘要: This study explores the effects of cooling rate after solution heat treatment on the high temperature/low stress (982 degrees C/200 MPa) creep properties of CM-247LC Nickel base superalloy. Cooling rate was controlled by blowing argon gas, air cooling, and furnace cooling, which, in turn, gave rise to corresponding cooling rates (from 1260 degrees C to 800 degrees C) of 18.7, 7.4, and 0.19 degrees C/s, respectively. The results indicated that higher cooling rate from the solution heat treatment temperature led to finer gamma\' precipitates and much improved tertiary creep as well as rupture life time in high-temperature creep test. The microstructural analyses using both scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that finer gamma\' precipitates and narrower gamma channel width could result in denser rafting structure which might have hindered the climb of dislocations across the precipitates rafts. (C) 2015 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.msea.2015.12.094
http://hdl.handle.net/11536/132730
ISSN: 0921-5093
DOI: 10.1016/j.msea.2015.12.094
期刊: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume: 655
起始頁: 237
結束頁: 243
Appears in Collections:Articles