Thermal Stability of GH4065A Superalloy Based on Microstructural and Performance Evolution Following Long-Term Aging

doi:10.1007/s12540-023-01510-x

IMR OpenIR

	Thermal Stability of GH4065A Superalloy Based on Microstructural and Performance Evolution Following Long-Term Aging
	Bai, Yingbo 1,2; Zhang, Rui 1; Cui, Chuanyong 1; Zhou, Yizhou 1; Sun, Xiaofeng 1
通讯作者	Zhang, Rui(rzhang@imr.ac.cn) ; Cui, Chuanyong(chycui@imr.ac.cn)
	2023-08-27
发表期刊	METALS AND MATERIALS INTERNATIONAL
ISSN	1598-9623
页码	15
摘要	This study investigates the thermal stability of a GH4065A superalloy at intermediate temperatures by conducting long-term aging treatments for 100-6000 h at 700-800 degrees C. Secondary gamma'-phase coarsening and intergranular M6C carbide precipitation occurred during aging. The activation energy for secondary gamma'-phase coarsening was 259.89 +/- 25.45 kJ mol(-1), suggesting that this process was predominantly controlled by elemental diffusion. The tensile strength at a testing temperature of 700 degrees C was stably above 1200 MPa for the alloys aged at 700 degrees C but continuously declined as the aging temperature increased, with a direct correlation identified between the secondary gamma'-phase coarsening and strength reduction upon aging. Increasing the aging temperature transitioned the deformation mechanism from Orowan bowing around the gamma' phase to dislocation slip through the broadened matrix channels, leading to decreased strength. Long-term aging effectively eliminated intermediatetemperature intergranular brittle fracture. The elongation to failure at a testing temperature of 700 degrees C increased by approximately 35% after aging at 800 degrees C for 6000 h, attributed to grain-boundary diffusion of W and Mo and intragranular softening, which improved the deformation coordination ability at the grain boundaries. Finally, the precipitation of intergranular M6C particles after prolonged aging promoted plastic deformation via micropore aggregation.
关键词	Superalloy GH4065A Long-term aging Deformation and fracture M6C carbide
资助者	National Key R& D Program of China ; IMR Innovation Fund ; National Science and Technology Major Project of China ; Doctoral Start- up Foundation of Liaoning Province
DOI	10.1007/s12540-023-01510-x
收录类别	SCI
语种	英语
资助项目	National Key R& D Program of China[2019YFA0705300] ; National Key R& D Program of China[2017YFA0700703] ; IMR Innovation Fund[2021-PY09] ; National Science and Technology Major Project of China[2019VI-0006-0120] ; Doctoral Start- up Foundation of Liaoning Province[2020-BS-007]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001063724600001
出版者	KOREAN INST METALS MATERIALS
引用统计	被引频次：1[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/321006/179217
专题	中国科学院金属研究所
通讯作者	Zhang, Rui; Cui, Chuanyong
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	Bai, Yingbo,Zhang, Rui,Cui, Chuanyong,et al. Thermal Stability of GH4065A Superalloy Based on Microstructural and Performance Evolution Following Long-Term Aging[J]. METALS AND MATERIALS INTERNATIONAL,2023:15.
APA	Bai, Yingbo,Zhang, Rui,Cui, Chuanyong,Zhou, Yizhou,&Sun, Xiaofeng.(2023).Thermal Stability of GH4065A Superalloy Based on Microstructural and Performance Evolution Following Long-Term Aging.METALS AND MATERIALS INTERNATIONAL,15.
MLA	Bai, Yingbo,et al."Thermal Stability of GH4065A Superalloy Based on Microstructural and Performance Evolution Following Long-Term Aging".METALS AND MATERIALS INTERNATIONAL (2023):15.