Creep failure and deformation mechanism investigation on a novel single crystal superalloy with various primary ageing temperatures

doi:10.1016/j.engfailanal.2021.105963

IMR OpenIR

	Creep failure and deformation mechanism investigation on a novel single crystal superalloy with various primary ageing temperatures
	Tao, X. P.1,2; Wang, X. G.1; Meng, J.1; Zhou, Y. Z.1; Yang, Y. H.1; Liu, J. L.1; Liu, J. D.1; Li, J. G.1; Sun, X. F.1
通讯作者	Wang, X. G.(xgwang11b@imr.ac.cn) ; Zhou, Y. Z.(yzzhou@imr.ac.cn)
	2022-03-01
发表期刊	ENGINEERING FAILURE ANALYSIS
ISSN	1350-6307
卷号	133 页码:14
摘要	The heat treatment design and optimization of Re-free low-cost single crystal (SX) superalloys, which are commonly regarded as the most practical and economic alloys to manufacture guide vanes and high-pressure turbine blades of aero-engines, are in great demand. In this study, significant adjustments to the primary ageing temperature (PAT) were made, and the synthetic impact of PAT variations from 1050 degrees C to 1100 degrees C on the microstructure and creep behaviours in novel Re-free SX alloys was investigated in detail. The results showed that the gamma' size and gamma/gamma' lattice misfit increased with increasing PAT, resulting in a reduction in the gamma/gamma' interface area and a shift in the morphology of gamma' from spherical to cubical. Notably, element diffusion and the resultant coarsening of gamma/gamma' structures were facilitated by increasing the PAT. The alloy with 1080 degrees C PAT showed the longest creep life at 1100 degrees C/137 MPa, which was approximately 1.5 and 1.2 times that of alloys with PATs of 1050 degrees C and 1100 degrees C, respectively. Moreover, as PAT increased, the number of microvoids decreased due to increasing the diffusion rate of elements and hindering the formation of vacancies. When the PAT was too low or too high, the "inland shapes" of the gamma' phase and topological inversion phenomenon occurred during creep, which were detrimental to the creep properties. Furthermore, increasing the PAT resulted in the morphology of gamma/gamma' interfacial dislocation networks shifting from sparse waves to fine hexagons and then to coarse hexagons. The dense interfacial dislocation networks in the sample with 1080 degrees C PAT remarkably impeded superdislocations cutting into gamma' phases. Ultimately, the thermodynamics and kinetics of gamma' formation and growth were also discussed, and the optimum PAT was ascertained to provide further guidance to design and develop Re-free low-cost SX superalloys.
关键词	Creep rupture Deformation mechanism High temperature Single crystal superalloy Primary ageing temperature
资助者	National Key R&D Program of China ; National Science and Technology Major Project ; Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences
DOI	10.1016/j.engfailanal.2021.105963
收录类别	SCI
语种	英语
资助项目	National Key R&D Program of China[2017YFA0700704] ; National Science and Technology Major Project[2017-VI-0002-0072] ; Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences[CXYJJ20-MS-03] ; Youth Innovation Promotion Association, Chinese Academy of Sciences
WOS研究方向	Engineering ; Materials Science
WOS类目	Engineering, Mechanical ; Materials Science, Characterization & Testing
WOS记录号	WOS:000753120200001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：11[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/173445
专题	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, Shi Changxu Innovat Ctr Adv Mat, 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.,Meng, J.,et al. Creep failure and deformation mechanism investigation on a novel single crystal superalloy with various primary ageing temperatures[J]. ENGINEERING FAILURE ANALYSIS,2022,133:14.
APA	Tao, X. P..,Wang, X. G..,Meng, J..,Zhou, Y. Z..,Yang, Y. H..,...&Sun, X. F..(2022).Creep failure and deformation mechanism investigation on a novel single crystal superalloy with various primary ageing temperatures.ENGINEERING FAILURE ANALYSIS,133,14.
MLA	Tao, X. P.,et al."Creep failure and deformation mechanism investigation on a novel single crystal superalloy with various primary ageing temperatures".ENGINEERING FAILURE ANALYSIS 133(2022):14.