Pt-Al bond coat dependence on the creep stress distribution, deformation and fracture behaviour in a second generation Ni-based single crystal superalloy

doi:10.1016/j.msea.2020.140575

CORC > 金属研究所 > 中国科学院金属研究所

	Pt-Al bond coat dependence on the creep stress distribution, deformation and fracture behaviour in a second generation Ni-based single crystal superalloy
	Tao, X. P.1,2; Wang, X. G.1; Zhou, Y. Z.1; Tan, K. J.1,2; Liang, J. J.1; Yang, Y. H.1; Liu, J. L.1; Liu, J. D.1; Li, J. G.1; Sun, X. F.1
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2021-02-23
卷号	805 页码:13
关键词	Creep stress distribution Deformation mechanism Fracture behaviour Single crystal superalloy Pt-Al bond Coat
ISSN号	0921-5093
DOI	10.1016/j.msea.2020.140575
通讯作者	Wang, X. G.(xgwang11b@imr.ac.cn) ; Zhou, Y. Z.(yzzhou@imr.ac.cn)
英文摘要	An evaluation was conducted on the impact of a Pt-Al bond coat on the creep behaviours of a second-generation Ni-based single crystal superalloy at 750 degrees C/820 MPa, 850 degrees C/630 MPa, 1038 degrees C/137 MPa and 1100 degrees C/112 MPa, respectively. As revealed by the creep results, the creep behaviours of the coated superalloy were inferior to those of the bare superalloy to some extent under all testing conditions. The maximum deterioration in the strainto-fracture and time-to-rupture was observed at 1100 degrees C/112 MPa (7.3%) and 750 degrees C/820 MPa (74.7 h), respectively. Following the creep test, deconvolution calculations were performed, which indicated that the creep stress for all core superalloys was as low as approximately 1.7-1.9% of the applied stress while the bond coat stress was 4.0-10.4% that at the minimum creep rate. Moreover, TEM analyses revealed that within the superalloy substrate adjacent to the bond coat, there were fewer stacking faults and an abundance of dislocation debris observed within gamma'-Ni3Al at 750 degrees C/820 MPa. The misfit of the gamma/gamma' phase was insignificant and the dislocation networks became irregular at 1100 degrees C/112 MPa. With an increase in temperature from 750 degrees C to 1100 degrees C, the fracture mechanism of both the substrate and bond-coat was found to shift from quasi-cleavage to micro-void coalescence. The quasi-cleavage cracks occurring within the bond coat increased the number of connections with creep cracks to cause spreading from the interior of the samples, thus resulting in premature failure at 750 degrees C/820 MPa and 850 degrees C/630 MPa. However, the degradation at 1038 degrees C/137 MPa and 1100 degrees C/112 MPa was ascribed to the increasing thickness of the inter-diffusion zone, as well as the volume of the blocky gamma'-Ni3Al phase inside the bond coat and topologically close-packed phases in the superalloy near the bond coat.
资助项目	National Natural Science Foundation of China (NSFC)[51701210] ; National Natural Science Foundation of China (NSFC)[51671188] ; National Science and Technology Major Project[2017-VI-0002-0072] ; National Key R&D Program of China[2017YFA0700704] ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences[CXYJJ20-MS-03]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000620162200002
资助机构	National Natural Science Foundation of China (NSFC) ; National Science and Technology Major Project ; National Key R&D Program of China ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/160865]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, X. G.; Zhou, Y. Z.
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Tao, X. P.,Wang, X. G.,Zhou, Y. Z.,et al. Pt-Al bond coat dependence on the creep stress distribution, deformation and fracture behaviour in a second generation Ni-based single crystal superalloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2021,805:13.
APA	Tao, X. P..,Wang, X. G..,Zhou, Y. Z..,Tan, K. J..,Liang, J. J..,...&Sun, X. F..(2021).Pt-Al bond coat dependence on the creep stress distribution, deformation and fracture behaviour in a second generation Ni-based single crystal superalloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,805,13.
MLA	Tao, X. P.,et al."Pt-Al bond coat dependence on the creep stress distribution, deformation and fracture behaviour in a second generation Ni-based single crystal superalloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 805(2021):13.