The influence of long-term thermal exposure on intermediate temperature brittleness behavior of a Nickel-base superalloy

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	The influence of long-term thermal exposure on intermediate temperature brittleness behavior of a Nickel-base superalloy
	Y. H. Yang; J. J. Yu; X. F. Sun; T. Jin; H. R. Guan; Z. Q. Hu
	2012
发表期刊	Materials Characterization
ISSN	1044-5803
卷号	66 页码:30-37
摘要	The morphology of gamma' precipitates and intermediate temperature brittleness behavior of samples aged at 700 degrees C and 800 degrees C for different aging times then tested at 700 degrees C and 800 degrees C, is investigated. The results show that the gamma' precipitates remain cuboidal in shape and regularly aligned in the matrix after long-term thermal exposure at 700 degrees C and 800 degrees C. The size of secondary gamma' precipitates increases greatly after long-term exposure at 800 degrees C. The growth of gamma' precipitates would enhance the possibility of dislocation-dislocation and dislocation-gamma' precipitate interactions, resulting in a high yield stress after long-term thermal exposure. For samples tested at 700 degrees C, the elongation of samples aged at 700 degrees C and 800 degrees C gradually decreases with increasing aging time. However, for samples tested at 800 degrees C the elongation of samples aged at 700 degrees C and 800 degrees C gradually increases, and the elongation is higher for than samples tested at 700 degrees C. In addition, the gamma' precipitates are sheared easily by dislocations after long-term thermal exposure. The intermediate temperature brittleness behavior is not eliminated during long-term thermal exposure at intermediate temperatures, while the intermediate temperature brittleness behavior takes place at the lower temperature. Additionally, gamma' precipitates sheared by dislocations is dominant deformation mechanism. (C) 2012 Elsevier Inc. All rights reserved.
部门归属	[yang, y. h.; yu, j. j.; sun, x. f.; jin, t.; guan, h. r.; hu, z. q.] chinese acad sci, inst met res, superalloy div, shenyang, peoples r china.;yu, jj (reprint author), chinese acad sci, inst met res, superalloy div, shenyang, peoples r china.;jjyu@imr.ac.cn
关键词	M951 Superalloy Long-term Thermal Exposure Microstructure Intermediate Temperature Brittleness Single-crystal Superalloy Mechanical-properties M951 Alloy Microstructure Dependence Boron Fracture
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60403
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. H. Yang,J. J. Yu,X. F. Sun,et al. The influence of long-term thermal exposure on intermediate temperature brittleness behavior of a Nickel-base superalloy[J]. Materials Characterization,2012,66:30-37.
APA	Y. H. Yang,J. J. Yu,X. F. Sun,T. Jin,H. R. Guan,&Z. Q. Hu.(2012).The influence of long-term thermal exposure on intermediate temperature brittleness behavior of a Nickel-base superalloy.Materials Characterization,66,30-37.
MLA	Y. H. Yang,et al."The influence of long-term thermal exposure on intermediate temperature brittleness behavior of a Nickel-base superalloy".Materials Characterization 66(2012):30-37.