Transactions of Materials and Heat Treatment

Title：Rheological behavior and microstructure evolution on Ti-6Al-4V titanium alloy by hot machining

Authors： Wang Liying Yang You Liu Chunlan

Unit： Jilin Railway Technology College Changchun University of Technology Harbin University of Technology

KeyWords： Ti-6Al-4V titanium alloy hot shear-compression rheological behavior softening mechanism microstructure

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2020,45(12):183-190

Abstract：

The Ti-6Al-4V titanium alloy was treated by hot shear-compression in thermal simulator Gleeble-3800 with the deformation temperature of 900-1100 ℃ and the strain rate of 007-70 s-1, the rheological behavior and microstructure evolution of Ti-6Al-4V titanium alloy under different processing parameters of hot machining were compared and analyzed. The results show that at the same strain rate, with the increasing of deformation temperature from 900 ℃ to 1100 ℃, the peak stress of Ti-6Al-4V titanium alloy decreases gradually, while at the same deformation temperature, the higher the strain rate is, the greater the peak stress is. However, there is no obvious ‘discontinuous yield’phenomenon in the stress-strain curve under 950 ℃/70 s-1 deformation condition, but ‘rheological fluctuation’phenomenon can be seen. When the deformation temperature is 1050 and 1100 ℃ and the strain rate is 007 and 70 s-1, there is ‘discontinuous yield’ phenomenon in the strain-strain curve of Ti-6Al-4V titanium alloy. Furthermore, when the deformation temperature is 950 ℃, the strain rate sensitive coefficient m increases with the increasing of strain rate, while at other deformation temperatures, m decreases with the increasing of strain rate. This is mainly due to the dynamic transformation of Ti-6Al-4V titanium alloy during the thermal deformation process at 950 ℃/70 s-1, which causes the partial equiaxed ɑ phase to transform into lath ɑ phase, and the transition from ɑ phase to β phase，dynamic recovery and dynamic recrystallization occur during the thermal deformation of single-phase region which resulting in softening.

Funds：

吉林省青年科研基金（20190520037JH）；吉林省教育厅“十三五”科研基金(2019115)

王立颖（1982-），女，硕士，讲师 E-mail：wangliying0830@163com

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