Hot compression behaviors and deformation mechanisms of a Ni-Co-based superalloy with columnar grains

doi:10.1016/j.msea.2021.142370

IMR OpenIR

	Hot compression behaviors and deformation mechanisms of a Ni-Co-based superalloy with columnar grains
	Zhou, Zijian 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)
	2022-01-26
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	833 页码:12
摘要	In this work, hot compression behaviors and deformation mechanisms of a Ni-Co-based superalloy prepared using directional solidification (DS) were investigated by carrying out the isothermal compression tests within the temperature range of 1080-1190 degrees C and the strain rate range of 0.001-1 s(-1) under the true strain of 0.693. The effects of temperature and strain rate on dynamic recrystallization (DRX) were analyzed, and constitutive equations were established. The activation energies for gamma+gamma' dual-phase and the gamma single-phase regions of Ni-Co-based superalloy with columnar grains were 1190 kJ mol(-1) and 415 kJ mol(-1), respectively. The results showed that the dominant deformation mechanisms were closely related to the strain rate and temperature. DRX was accelerated at low strain rate conditions, while the DRX process was apparently sluggish at strain rates higher than 1 s(-1). The undissolved gamma' phase interacted with dislocations and accelerated the DRX of the matrix during gamma' sub-solvus temperature (1080-1120 degrees C) deformation. Continuous dynamic recrystallization (CDRX) nucleation proved to play a dominant role. During gamma' super-solvus temperature (1150-1190 degrees C) deformation, the dominant dynamic softening mechanism of the alloy is discontinuous dynamic recrystallization (DDRX). Local migration of grain boundaries (GBs) causes an increase of misorientation within the deformed grains and induced the formation of subgrain boundaries near the GBs, which subsequently evolved into high angle grain boundaries (HAGBs) and participated in DDRX. Furthermore, during high-temperature deformation in Ni-Co-based super alloys, the relatively rare microtwins (MTs) were detected under compression at 1100 degrees C/1 s(-1).
关键词	Recrystallization Ni-Co-Based superalloy Directional solidification Constitutive equation Microstructural evolution
资助者	National Key R&D Program of China ; National Science and Technology Major Project of China ; IMR Innovation Fund ; Doctoral Start-up Foundation of Liaoning Province
DOI	10.1016/j.msea.2021.142370
收录类别	SCI
语种	英语
资助项目	National Key R&D Program of China[2019YFA0705304] ; National Key R&D Program of China[2017YFA0700703] ; National Science and Technology Major Project of China ; IMR Innovation Fund[2021-PY09] ; Doctoral Start-up Foundation of Liaoning Province
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000761604800002
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：36[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/321006/173157
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, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Zijian,Zhang, Rui,Cui, Chuanyong,et al. Hot compression behaviors and deformation mechanisms of a Ni-Co-based superalloy with columnar grains[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2022,833:12.
APA	Zhou, Zijian,Zhang, Rui,Cui, Chuanyong,Zhou, Yizhou,&Sun, Xiaofeng.(2022).Hot compression behaviors and deformation mechanisms of a Ni-Co-based superalloy with columnar grains.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,833,12.
MLA	Zhou, Zijian,et al."Hot compression behaviors and deformation mechanisms of a Ni-Co-based superalloy with columnar grains".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 833(2022):12.