Hot deformation behavior of new type of near β type Ti-5.5Mo-6V-7Cr-4Al-2Sn-1Fe alloy
Qiang ZHOU1,2, Jun CHENG2,3, Zhen-tao YU2, Wen-fang CUI1,*()
1 Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education), Northeast University, Shenyang 110004, China 2 Shaanxi Key Laboratory of Biomedical Metal Materials, Northwest Institute for Non-ferrous Metal Research, Xi'an 710016, China 3 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
The isothermal constant strain rate compression tests of Ti-5.5Mo-6V-7Cr-4Al-2Sn-1Fe alloy were conducted by Gleeble-3800 simulator. The hot deformation temperature range is from 655℃ to 855℃ and the strain rate range is from 0.001s-1 to 10s-1 and the maximum true strain is 0.8. A high temperature flow stress model was built with activation energy of 255kJ/mol according to the experimental results for the alloy and the processing map of alloy was constructed according to DMM model. The metallographic analysis of alloy shows that the alloy exhibits domain of flow localization and adiabatic shear bands and low power dissipation efficiency in the high strain rate(1-10s-1). The alloy undergoes dynamic recovery in the temperature region of 655-755℃ and the strain rate below 0.01s-1. The dynamic recrystallization takes place at the strain rate below 0.01s-1 and in the temperature region of 755-855℃, the original deformed grains and recrystallized grains gradually grow with the increase of temperature. When the temperature is 755-770℃ and the strain rate is 0.001-0.003s-1, the alloy's power dissipation efficiency reaches the maximum and the recrystallized grain is uniform and fine. These regions can be considered as the optimal parameter range of isothermal compression for the alloy.
周强, 程军, 于振涛, 崔文芳. 一种新型近β型Ti-5.5Mo-6V-7Cr-4Al-2Sn-1Fe合金热变形行为[J]. 材料工程, 2019, 47(6): 121-128.
Qiang ZHOU, Jun CHENG, Zhen-tao YU, Wen-fang CUI. Hot deformation behavior of new type of near β type Ti-5.5Mo-6V-7Cr-4Al-2Sn-1Fe alloy. Journal of Materials Engineering, 2019, 47(6): 121-128.
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