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Microstructure and texture evolution during symmetric and asymmetric rolling of a martensitic Ti-6Al-4V alloy

Chao,Q, Hodgson,PD and Beladi,H 2016, Microstructure and texture evolution during symmetric and asymmetric rolling of a martensitic Ti-6Al-4V alloy, Metallurgical and materials transactions A : physical metallurgy and materials science, vol. 47, no. 1, pp. 531-545, doi: 10.1007/s11661-015-3211-y.

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Title Microstructure and texture evolution during symmetric and asymmetric rolling of a martensitic Ti-6Al-4V alloy
Author(s) Chao,Q
Hodgson,PD
Beladi,H
Journal name Metallurgical and materials transactions A : physical metallurgy and materials science
Volume number 47
Issue number 1
Start page 531
End page 545
Total pages 15
Publisher Springer
Place of publication New York, N.Y.
Publication date 2016-01
ISSN 1073-5623
1543-1940
Keyword(s) asymmetric rolling
symmetric rolling
pct rolling reduction
plane strain compression
basal texture
warm rolling
asymmetric rolling processes
orientation distribution function
hot rolling texture
transformation texture
maximum texture intensity
pole figure
texture evolution
martensite
Summary In the current study, the effect of deformation mode (i.e., symmetric vs asymmetric rolling) on the extent of grain refinement and texture development in Ti-6Al-4V was examined through warm rolling of a martensitic starting microstructure. During rolling, the initial martensitic lath structure was progressively fragmented, primarily through continuous dynamic recrystallization. This eventually led to an ultrafine-grained (UFG) microstructure composed of equiaxed grains with a mean size of 180 to 230 nm, mostly surrounded by high-angle grain boundaries. Depending on the rolling reduction and deformation mode (symmetric and asymmetric), the rolled specimens displayed different layer morphologies throughout the specimen thickness: a fully UFG surface layer, a partial UFG transition layer, and a partially fragmented lath interior layer. Due to a higher level of effective strain and continuous rotation of the principle axis, asymmetric rolling resulted in a greater extent of grain refinement compared with symmetric rolling at a given thermomechanical condition. A bulk UFG structure was successfully obtained using 70 pct asymmetric rolling. In addition, the rolling texture exhibited various characteristics throughout the thickness due to a different combination of shear and compressive strains. Principally, the basal texture component was displaced from the normal toward rolling direction during asymmetric rolling, differing from the symmetric rolling textures.
Language eng
DOI 10.1007/s11661-015-3211-y
Field of Research 091207 Metals and Alloy Materials
0912 Materials Engineering
0306 Physical Chemistry (Incl. Structural)
0913 Mechanical Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Minerals, Metals & Materials Society and ASM International
Persistent URL http://hdl.handle.net/10536/DRO/DU:30079879

Document type: Journal Article
Collection: Institute for Frontier Materials
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