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Effects of cobalt on creep rupture properties and dislocation structures in nickel base superalloys
W. Z.; Jin Wang, T.; Jia, J. H.; Liu, J. L.; Hu, Z. Q.
2015
Source PublicationMaterials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN0921-5093
Volume624Pages:220-228
AbstractThe influences of cobalt (Co) on creep rupture lives and dislocation structures in nickel base superalloys with and without rhenium (Re) are investigated. The creep rupture test conditions were high temperature low stress (1100 degrees C/150 MPa), intermediate temperature and stress (982 degrees C, 1010 degrees C) and low temperature high stress (850 degrees C/586 MPa). The results show that increasing Co content could enhance the creep rupture lives at low and intermediate temperature, and does not degrade the creep rupture lives of alloys at high temperature. In Re-containing alloys, at high temperature low stress (1100 degrees C/150 MPa), the effects of Co on the dislocation structures are negligible, while at low temperature high stress (850 degrees C/586 MPa), stacking faults are generated in alloy with 12% Co, and in alloy with 3% Co and free of Co, gamma prime particles are sheared by dislocation pairs. In Re-free alloys, at intermediate temperature and stress (1010 degrees C/248 MPa), large quantities of stacking faults appear in alloy without Co, while in alloy having 12% Co, gamma prime particles are sheared by dislocation pairs coupled by anti-phase boundary (APB). The gamma prime sheared by stacking faults or by dislocation pairs coupled by APB depends on the competition of stacking faults energy and APB energy which is affected by temperature and the interaction of Re and Co. (C) 2014 Elsevier B.V. All rights reserved.
description.department[wang, w. z. ; jia, j. h.] chinese acad sci, lanzhou inst chem phys, state key lab solid lubricat, lanzhou 730000, peoples r china. [wang, w. z. ; jin, t. ; liu, j. l. ; hu, z. q.] chinese acad sci, inst met res, dept superalloys, shenyang 110016, peoples r china. ; jin, t (reprint author), chinese acad sci, inst met res, dept superalloys, 72 wenhua rd, shenyang 110016, peoples r china. ; tjin@imr.ac.cn
KeywordCobalt Rhenium Creep Rupture Lives Dislocation Structures Nickel Base Superalloys Single-crystal Superalloys Low-stress Creep Gamma'-phase High-temperature Re Precipitation Behavior Rhenium Cmsx-4 Microstructure
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73961
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
W. Z.,Jin Wang, T.,Jia, J. H.,et al. Effects of cobalt on creep rupture properties and dislocation structures in nickel base superalloys[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2015,624:220-228.
APA W. Z.,Jin Wang, T.,Jia, J. H.,Liu, J. L.,&Hu, Z. Q..(2015).Effects of cobalt on creep rupture properties and dislocation structures in nickel base superalloys.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,624,220-228.
MLA W. Z.,et al."Effects of cobalt on creep rupture properties and dislocation structures in nickel base superalloys".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 624(2015):220-228.
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