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The origin of coarse macrograin during thermo-mechanical processing in a high temperature titanium alloy
Gao, Xiongxiong; Zeng, Weidong; Ma, Haoyuan; Zhou, Dadi; Zhao, Qinyang; Wang, Qingjiang
2019-02-15
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume775Pages:589-600
AbstractCoarse 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.
KeywordTitanium alloy Macrostructure Microstructure Thermo-mechanical processing Crystallographic orientation
Indexed BySCI
Language英语
WOS IDWOS:000450981100072
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81373
Collection中国科学院金属研究所
Recommended Citation
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.
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