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The effect of reheat treatments on recovering the creep behavior of a corrosion-resistant nickel-based superalloy
J. S. Hou; L. Z. Zhou; C. Yuan; Z. Tang; J. T. Guo; X. Z. Qin; P. K. Liaw
2013
Source PublicationMaterials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN0921-5093
Volume560Pages:25-33
AbstractThe present work is an attempt to possibly obtain the most suitable reheat treatment, which could provide the optimal microstructural characteristics for creep-exposed superalloys. After creep at 850 degrees C/350 MPa for 96 h and 140 h a cast nickel-based superalloy was reheat-treated with different programs, and then the specimens were subjected to creep again at the same condition. Creep tests indicate that during reheat treatment applying aging at lower temperature, 850 degrees C, for proper time (4 h) before aging at 1050 degrees C rather than a repeated standard heat treatment is beneficial to restore creep life. Creep-induced changes in the microstructure, such as excessive grain-boundary secondary M23C6 and/or M6C carbides formation, and primary MC carbides decomposition, are noticeably more advanced in the reheat-treated alloys. A quantitative study on the dissolution of sigma phases and the formation of cavitations is presented. After the interrupted creep, the gamma' particles at dendrite cores remained cubic-shaped. However, the rafting of cuboidal gamma' precipitates was observed in the same creep condition by the reheat treatment programs. Design of a reheat treatment for recovering the creep properties should emphasize the promotion of ductility rather than strength of the alloy. An equation based on the continuum damage-mechanics theory, was suggested to evaluate the remaining creep life. (c) 2012 Elsevier B.V. All rights reserved.
description.department[hou, j. s. ; zhou, l. z. ; yuan, c. ; guo, j. t. ; qin, x. z.] chinese acad sci, inst met res, shenyang 110016, peoples r china. [hou, j. s. ; tang, z. ; liaw, p. k.] univ tennessee, dept mat sci & engn, knoxville, tn 37996 usa. ; guo, jt (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china. ; jtguo@imr.ac.cn
KeywordNickel-based Superalloy Reheat Treatment Creep Life Gamma ' Rafting Sigma Phase Carbides Single-crystal Superalloy High-temperature Creep Mechanical-properties Dislocation Networks Heat-treatment Microstructure Segregation Kinetics Cmsx-4 K-44
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/71260
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
J. S. Hou,L. Z. Zhou,C. Yuan,et al. The effect of reheat treatments on recovering the creep behavior of a corrosion-resistant nickel-based superalloy[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2013,560:25-33.
APA J. S. Hou.,L. Z. Zhou.,C. Yuan.,Z. Tang.,J. T. Guo.,...&P. K. Liaw.(2013).The effect of reheat treatments on recovering the creep behavior of a corrosion-resistant nickel-based superalloy.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,560,25-33.
MLA J. S. Hou,et al."The effect of reheat treatments on recovering the creep behavior of a corrosion-resistant nickel-based superalloy".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 560(2013):25-33.
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