Deformation behavior and microstructure evolution in multistage hot working of TA15 titanium alloy: on the role of recrystallization |
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Authors: | X G Fan H Yang P F Gao |
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Affiliation: | (1) State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, P.O. Box 542, Xi’an, 710072, People’s Republic of China |
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Abstract: | Interrupted compression tests of TA15 titanium alloy with initially equiaxed microstructure were carried out at deformation
temperatures between 1173 to 1273 K and strain rates between 0.001 to 0.1 s−1 to investigate the deformation behavior and microstructure evolution under multistage deformation. The TA15 alloy exhibits
significant flow softening in both β and (α + β) working. It is found that the flow softening relates to dynamic recrystallization
of β phases under current experimental conditions. In multistage β working, metadynamic recrystallization is the main softening
mechanism during inter-pass holding. The grain refinement by metadynamic recrystallization leads to the decrease in peak stress
upon reloading. In multistage (α + β) working, static recrystallization is the main softening mechanism during inter-pass
holding. The static recrystallization kinetics increases with temperature and strain rate. The inter-pass holding has little
influence on the morphology of the primary α phases. The β grain size is determined by spacing of primary α phases, which
is more affected by working temperature but less dependent on strain rate and inter-pass holding time. |
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