Abstract
The hot deformation behaviours of Ti-6Al-4V-0.1Ru alloy were investigated by isothermal hot compression tests in the temperature range of 1023-1423 K and strain rate range of 0.01-10 s-1. The β transus was determined to be 1198 K by continuous heating method. The values of deformation activation energy Q at the strain of 0.3 were calculated to be 630.01 kJ/mol in dual-phase field and 331.75 kJ/mol in β-phase field. Moreover, the processing maps at the strain of 0.2, 0.4, 0.6 and 0.8 were developed based on dynamic materials model (DMM). To deeply understand the microstructure evolution mechanism during hot deformation processes and to verify the processing maps, the microstructures at different deformation conditions were observed. The stable microstructures (i.e. globularization, dynamic recovery (DRV) and β dynamic recrystallization (β-DRX)) and instable microstructures (i.e. lamellae kinking and flow localization) were obtained. To make it useful in the design of industrial hot working schedules for this material, a microstructural mechanism map was constructed on the basis of processing maps and microstructure observation. Deformation conditions in the vicinity of 1150 K & 0.01 s-1 where globularization occurs and in the vicinity of 1323 K & 0.01 s-1 where β-DRX occurs are recommended.
Highlights
Ti-6Al-4V-0.1Ru is a kind of (α+β) titanium alloy which is widely used in the field of energy and chemical processing industries because of its high corrosion resistance, excellent mechanical properties and low density etc
In β-phase field, β-DRX occurs at the region with the η-value higher than 0.47, and β-phase dynamic recovery (DRV) occurs at the deformation condition of 1198-1360 K & 0.01-0.708 s-1 excluding the β-DRX region
Hot compression testing of Ti-6Al-4V-0.1Ru alloy has been conducted in the temperature range 1023-1423 K and the strain rate range 0.01-10 s-1
Summary
Ti-6Al-4V-0.1Ru is a kind of (α+β) titanium alloy which is widely used in the field of energy and chemical processing industries because of its high corrosion resistance, excellent mechanical properties and low density etc. As concluded by Quan et al.[1] and Zhang et al.[2], the usability and mechanical properties of products are determined by the microstructures of the material. Wang et al.[6] characterized the hot workability of AA 7050 aluminum alloy and Quan et al.[7] identified the optimal working parameters of as-extrude 42CrMo high-strength steel. As concluded by Quan et al.[12], processing map based on DMM model has been widely used to obtain the stable and instable regions, optimize the deformation parameters, and control microstructures of alloys. Lin et al.[18] proposed a revised Arrhenius-type model to describe the flow behaviour of 42CrMo steel considering the effects of strain on material constants.
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