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

doi:10.1016/j.jallcom.2018.10.127

IMR OpenIR

	The origin of coarse macrograin during thermo-mechanical processing in a high temperature titanium alloy
	Gao, Xiongxiong 1; Zeng, Weidong 1; Ma, Haoyuan 1; Zhou, Dadi 1; Zhao, Qinyang 2; Wang, Qingjiang 3
通讯作者	Zeng, Weidong(zengwd@nwpu.edu.cn)
	2019-02-15
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	775 页码:589-600
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.
关键词	Titanium alloy Macrostructure Microstructure Thermo-mechanical processing Crystallographic orientation
资助者	Program of National Key Research and Development Plan of China
DOI	10.1016/j.jallcom.2018.10.127
收录类别	SCI
语种	英语
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
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000450981100072
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：21[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/321006/130600
专题	中国科学院金属研究所
通讯作者	Zeng, Weidong
作者单位	1.Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China 2.Univ Waikato, Fac Sci & Engn, Sch Engn, Private Bag 3105, Hamilton, New Zealand 3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
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.