Hot deformation behavior of new type of near β type Ti-5.5Mo-6V-7Cr-4Al-25n-1Fe alloy

被引：0
|
作者：
Zhou Qiang [1 ,2 ]
Cheng Jun [2 ,3 ]
Yu Zhen-tao [2 ]
Cui Wen-fang [1 ]
机构：
[1] Northeast Univ, Minist Educ, Key Lab Anisotropy & Texture Mat, Shenyang 110004, Liaoning, Peoples R China
[2] Northwest Inst Nonferrous Met Res, Shaanxi Key Lab Biomed Met Mat, Xian 710016, Shaanxi, Peoples R China
[3] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
CAILIAO GONGCHENG-JOURNAL OF MATERIALS ENGINEERING | 2019年 / 47卷 / 06期
关键词：
titanium alloy; hot deformation; flow stress model; hot processing map; flow instability; PROCESSING MAPS; MECHANISM; WORKING;
D O I：
10.11868/j.issn.1001-4381.2018.000273
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 degrees C to 855 degrees C 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 degrees C 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 degrees C , the original deformed grains and recrystallized grains gradually grow with the increase of temperature. When the temperature is 755-770 degrees C 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.
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页码：121 / 128
页数：8
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