Abnormal grain growth in the Ni-based wrought superalloy GH4698 bar during heat treatment

doi:10.1016/j.jmrt.2024.05.089

IMR OpenIR

	Abnormal grain growth in the Ni-based wrought superalloy GH4698 bar during heat treatment
	Qiao, Shichang 1,2; Liu, Shuai 1,2; Li, Na 1,2; Gao, Xinyu 1,2; Wen, Xin 1,2; Wang, Fengzhen 1,2; Yuan, Chao 1,2
通讯作者	Yuan, Chao(ychao@imr.ac.cn)
	2024-05-01
发表期刊	JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
ISSN	2238-7854
卷号	30 页码:6563-6575
摘要	The microstructure evolution of the wrought superalloy GH4698 bar subjected to annealing was investigated during solution treatment, with managing temperature and duration. The differences in mechanical properties between the core and the edge of annealed rod are attributed to residual stresses introduced by surface grinding in the shallow layers of the bar. Experimental findings of heat treatment revealed that grains in the core of the bar grow normally, with the average size exhibiting exponential growth with respect to the solution temperature and time. Abnormally large grains (ALGs) were observed at the edge of the rod under sup-solvus temperature. The presence of gamma ' can restrict grain growth, but the dissolution of gamma ' is not the fundamental cause leading to the occurrence of abnormal grain growth (AGG). The initial reason for AGG at the edge position lies in the presence of stored energy (SE). Grains undergoing abnormal growth are not with high SE and the nucleus of ALGs originate from static recrystallization triggered by SE. Differences in grain orientation spread (GOS) between grains serve as the driving force for AGG. The abnormal enlargement of grains coincides with the expansion of twin boundaries (TB). Sigma 3n (n = 1, 2 and 3) boundaries play an indispensable role in the formation and growth of ALGs.
关键词	Wrought superalloy Abnormal grain growth Stored energy Grain orientation spread Sigma 3 n boundary
资助者	Liaoning S T Project
DOI	10.1016/j.jmrt.2024.05.089
收录类别	SCI
语种	英语
资助项目	Liaoning S T Project[2023JH1/10400054]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001241607400001
出版者	ELSEVIER
引用统计	被引频次：6[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/321006/186948
专题	中国科学院金属研究所
通讯作者	Yuan, Chao
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Qiao, Shichang,Liu, Shuai,Li, Na,et al. Abnormal grain growth in the Ni-based wrought superalloy GH4698 bar during heat treatment[J]. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,2024,30:6563-6575.
APA	Qiao, Shichang.,Liu, Shuai.,Li, Na.,Gao, Xinyu.,Wen, Xin.,...&Yuan, Chao.(2024).Abnormal grain growth in the Ni-based wrought superalloy GH4698 bar during heat treatment.JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,30,6563-6575.
MLA	Qiao, Shichang,et al."Abnormal grain growth in the Ni-based wrought superalloy GH4698 bar during heat treatment".JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 30(2024):6563-6575.