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Hot Deformation Mechanism and Ring Rolling Behavior of Powder Metallurgy Ti2AlNb Intermetallics
Lu, Zheng-Guan; Wu, Jie; Guo, Rui-Peng; Xu, Lei; Yang, Rui; Xu, L (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
2017-07-01
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Volume30Issue:7Pages:621-629
AbstractPowder metallurgy (PM) Ti-22Al-24Nb-0.5Mo (at.%) alloys were prepared by hot isostatic pressing. In order to study the feasibility of PM ? ring rolling combined process for preparing Ti2AlNb rings, thermal mechanical simulation tests of PM Ti2AlNb alloys were conducted and two rectangular PM rings (150 mm in height, 75 mm in thickness, 350 mm in external diameter) were rolled as a validation experiment. Experimental results show that the flow stress of Ti2AlNb alloys exhibited a significant drop at the very beginning of the deformation (true strain <0.1), and became stable with the increase in strain. Stress instability phenomenon of PM Ti2AlNb alloys was more obvious than that of wrought alloy. Flow stress fluctuation at the initial stage of deformation is related to phase transition of Ti2AlNb alloys which strongly depends on heat treatment and thermal mechanical deformation process. Processing windows during initial stage of ring rolling process is very crucial. A sound PM Ti2AlNb rectangular ring blank (height = 150 mm, thickness = 30 mm, external diameter = 750 mm) was successfully rolled in two passes by using the improved heat preservation method and optimized rolling parameters. Tensile properties of PM Ti2AlNb alloy were improved, and the porosity was reduced after ring rolling.; Powder metallurgy (PM) Ti-22Al-24Nb-0.5Mo (at.%) alloys were prepared by hot isostatic pressing. In order to study the feasibility of PM ? ring rolling combined process for preparing Ti2AlNb rings, thermal mechanical simulation tests of PM Ti2AlNb alloys were conducted and two rectangular PM rings (150 mm in height, 75 mm in thickness, 350 mm in external diameter) were rolled as a validation experiment. Experimental results show that the flow stress of Ti2AlNb alloys exhibited a significant drop at the very beginning of the deformation (true strain <0.1), and became stable with the increase in strain. Stress instability phenomenon of PM Ti2AlNb alloys was more obvious than that of wrought alloy. Flow stress fluctuation at the initial stage of deformation is related to phase transition of Ti2AlNb alloys which strongly depends on heat treatment and thermal mechanical deformation process. Processing windows during initial stage of ring rolling process is very crucial. A sound PM Ti2AlNb rectangular ring blank (height = 150 mm, thickness = 30 mm, external diameter = 750 mm) was successfully rolled in two passes by using the improved heat preservation method and optimized rolling parameters. Tensile properties of PM Ti2AlNb alloy were improved, and the porosity was reduced after ring rolling.
description.department[lu, zheng-guan ; wu, jie ; guo, rui-peng ; xu, lei ; yang, rui] chinese acad sci, inst met res, shenyang 110016, peoples r china ; [lu, zheng-guan] univ sci & technol china, sch mat sci & engn, shenyang 110016, peoples r china ; [guo, rui-peng] northeastern univ, sch mat sci & engn, shenyang 110819, peoples r china
KeywordTi2alnb Alloy Powder Metallurgy Hot Deformation Ring Rolling
Subject AreaMetallurgy & Metallurgical Engineering
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78057
Collection中国科学院金属研究所
Corresponding AuthorXu, L (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Lu, Zheng-Guan,Wu, Jie,Guo, Rui-Peng,et al. Hot Deformation Mechanism and Ring Rolling Behavior of Powder Metallurgy Ti2AlNb Intermetallics[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2017,30(7):621-629.
APA Lu, Zheng-Guan,Wu, Jie,Guo, Rui-Peng,Xu, Lei,Yang, Rui,&Xu, L .(2017).Hot Deformation Mechanism and Ring Rolling Behavior of Powder Metallurgy Ti2AlNb Intermetallics.ACTA METALLURGICA SINICA-ENGLISH LETTERS,30(7),621-629.
MLA Lu, Zheng-Guan,et al."Hot Deformation Mechanism and Ring Rolling Behavior of Powder Metallurgy Ti2AlNb Intermetallics".ACTA METALLURGICA SINICA-ENGLISH LETTERS 30.7(2017):621-629.
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