Effect of Deformation Temperature on Microstructures and Mechanical Properties of TC4-DT Titanium Alloy
Effect of isothermal deformation temperature on microstructures and mechanical properties of TC4-DT titanium alloy was studied at the strain rate of 1×103s-1 and 60％ deformation degree. Experimental results showed that the titanium alloy microstructure was sensitive to temperature change. The equiaxed or bi-model microstructure was obtained when the isothermal forging was carried out below the transus temperature, while it was lamellar structure when forged above the transus temperature. The tensile strength did not change obviously with temperature. The plasticity in the two phase region and singlephase region did not varies much,but it was significantly greater in two-phase region than in single-phase region. The fracture surface of the tensile test showed only ductile transgranular fracture in the two phase region, while in the single-phase region both transgranular and intergranular fracture existed. Fracture toughness increased when temperature rose and it reached the maximum when the temperature was 35℃ above the transus temperature. With the temperature increasing, the fracture toughness increased while dimple diameter and depth decreased. Besides,secondary cracks were found in the lamellar structure.
Titanium alloy microstructure properties TCi-DT
Xiaona Peng Hongzhen Guo Zhifeng Shi Tao Wang
Northwestern Polytechnical University ,Xi an 710012,China
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
932-936
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）