The origin of coarse macrograin during thermo-mechanical processing in a high temperature titanium alloy

doi:10.1016/j.jallcom.2018.10.127

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	The origin of coarse macrograin during thermo-mechanical processing in a high temperature titanium alloy
	Gao, Xiongxiong 2; Zeng, Weidong 2; Ma, Haoyuan 2; Zhou, Dadi 2; Zhao, Qinyang 3; Wang, Qingjiang 1
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2019-02-15
卷号	775 页码:589-600
关键词	Titanium alloy Macrostructure Microstructure Thermo-mechanical processing Crystallographic orientation
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2018.10.127
通讯作者	Zeng, Weidong(zengwd@nwpu.edu.cn)
英文摘要	Coarse macrograins have been observed in aerospace components for a high temperature near-alpha titanium alloy Ti60. The present work was inspired to understand the origin of coarse macrograin and examine how strain affects the macro/microstructure. Thus, thermomechanical processing was conducted in alpha + beta phase field to simulate industrial production. This alloy with a bimodal microstructure was isothermally pre-deformed at 1019 degrees C and a constant strain rate of 0.1 s(-1) to height reductions of 15, 35, 55 and 75%. Heat treatment was conducted following deformation at 1024 degrees C for 30 min. The results showed that coarse macrograins originated from inadequate recrystallization of prior beta grains of initial billet. Deformation in the alpha + beta phase field does not form many new orientation beta grains but slightly scatters beta grain orientations around the orientations of big prior beta grains in small strain samples. Each of different coarse macrograins corresponds to a family of prior beta grains with similar crystallographic orientations with about 20 degrees of spread, which is outlined by secondary alpha (alpha(s)) plates having nearly parallel basal planes with similar crystallographic orientations. The size of macrograin decreases with increasing strain, which is consistent with the extent of recrystallization of prior beta grain. These understandings can be applied to optimize processing routes for the control of final macro/microstructure and properties in near-alpha titanium alloys. (C) 2018 Elsevier B.V. All rights reserved.
资助项目	Program of National Key Research and Development Plan of China[2016YFB0301203]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000450981100072
资助机构	Program of National Key Research and Development Plan of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/130598]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zeng, Weidong
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China 3.Univ Waikato, Fac Sci & Engn, Sch Engn, Private Bag 3105, Hamilton, New Zealand
推荐引用方式 GB/T 7714	Gao, Xiongxiong,Zeng, Weidong,Ma, Haoyuan,et al. The origin of coarse macrograin during thermo-mechanical processing in a high temperature titanium alloy[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2019,775:589-600.
APA	Gao, Xiongxiong,Zeng, Weidong,Ma, Haoyuan,Zhou, Dadi,Zhao, Qinyang,&Wang, Qingjiang.(2019).The origin of coarse macrograin during thermo-mechanical processing in a high temperature titanium alloy.JOURNAL OF ALLOYS AND COMPOUNDS,775,589-600.
MLA	Gao, Xiongxiong,et al."The origin of coarse macrograin during thermo-mechanical processing in a high temperature titanium alloy".JOURNAL OF ALLOYS AND COMPOUNDS 775(2019):589-600.