A Study of the Internal Deformation Fields and the Related Microstructure Evolution during Thermal Fatigue Tests of a Single-Crystal Ni-Base Superalloy

doi:10.3390/ma17122821

IMR OpenIR

	A Study of the Internal Deformation Fields and the Related Microstructure Evolution during Thermal Fatigue Tests of a Single-Crystal Ni-Base Superalloy
	Zong, Cui 1; Liu, Sujie 2; Ma, Guangcai 2; Guo, Yi 2; Huang, Zhaohui 1
通讯作者	Guo, Yi(yguo@imr.ac.cn)
	2024-06-01
发表期刊	MATERIALS
卷号	17 期号:12 页码:17
摘要	Ni-base superalloys operate in harsh service conditions where cyclic heating and cooling introduce deformation fields that need to be investigated in detail. We used the high-angular-resolution electron backscatter diffraction method to study the evolution of internal stress fields and dislocation density distributions in carbides, dendrites, and notch tips. The results indicate that the stress concentrations decay exponentially away from the notch, and this pattern of distribution was modified by the growth of cracks and the emission of dislocations from the crack tip. Crack initiation follows crystallographic traces and is weakly correlated with carbides and dendrites. Thermal cycles introduce local plasticity around carbides, the dendrite boundary, and cracks. The dislocations lead to higher local stored energy than the critical value that is often cited to induce recrystallization. No large-scale onset of recrystallization was detected, possibly due to the mild temperature (800 degrees C); however, numerous recrystallized grains were detected in carbides after 50 and 80 cycles. The results call for a detailed investigation of the microstructure-related, thermally assisted recrystallization phenomenon and may assist in the microstructure control and cooling channel design of turbine blades.
关键词	stress fields dislocation density distribution HR-EBSD thermal fatigue
资助者	National Natural Science Foundation of China ; National Science and Technology Major Project
DOI	10.3390/ma17122821
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[52201149] ; National Science and Technology Major Project[J2019-VI-0023-0139] ; National Science and Technology Major Project[J2019-VI-0019-0134]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:001255799400001
出版者	MDPI
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/187546
专题	中国科学院金属研究所
通讯作者	Guo, Yi
作者单位	1.Beijing Inst Aeronaut Mat, Natl Key Lab Adv High Temp Struct Mat, Beijing 100095, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zong, Cui,Liu, Sujie,Ma, Guangcai,et al. A Study of the Internal Deformation Fields and the Related Microstructure Evolution during Thermal Fatigue Tests of a Single-Crystal Ni-Base Superalloy[J]. MATERIALS,2024,17(12):17.
APA	Zong, Cui,Liu, Sujie,Ma, Guangcai,Guo, Yi,&Huang, Zhaohui.(2024).A Study of the Internal Deformation Fields and the Related Microstructure Evolution during Thermal Fatigue Tests of a Single-Crystal Ni-Base Superalloy.MATERIALS,17(12),17.
MLA	Zong, Cui,et al."A Study of the Internal Deformation Fields and the Related Microstructure Evolution during Thermal Fatigue Tests of a Single-Crystal Ni-Base Superalloy".MATERIALS 17.12(2024):17.