工业纯钛ECAP温变形的力学性能及热稳定性
Mechanical Properties and Thermal Stability of CP-Ti Processed by ECAP at Intermediate Temperature
王克平1, 赵西城2, 杨西荣2
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作者单位：1. 西安航空技术高等专科学校, 陕西 西安 710075; 2. 西安建筑科技大学, 陕西 西安 710055
中文关键字：工业纯钛； 等径弯曲通道变形； 温加工； 退火
英文关键字：commercial pure titanium(CP-Ti); ECAP; intermediate-temperature; annealing
中文摘要：采用两通道夹角Φ=90°，外圆角Ψ=20° 的模具，成功实现了工业纯钛BC方式6道次ECAP温变形，累积等效真应变达到约6.3，制得ECAP温变形试样后，对各道次ECAP温变形后的工业纯钛进行压下量为55%的冷轧变形。同时，观察分析了变形试样的显微组织及性能，并对各道次ECAP温变形试样的热稳定性进行研究。结果表明，经过6道次ECAP变形后，工业纯钛的抗拉强度达到760 MPa，伸长率为40%。当退火温度低于400 ℃时，ECAP变形试样的组织变化不大，显微硬度下降缓慢；当退火温度高于400 ℃时，由于发生了再结晶，显微硬度显著下降。
英文摘要： ECAP at intermediate temperature with rout BC was successfully processed to six passes in commercial pure titanium (CP-Ti) using a die with the internal angle Φ of 90° and outer curvature angle Ψ of 20°. The equivalent strain is about 6.3. At the end of the trial after intermediate temperature ECAP, the cold-rolling deformation of the samples was carried out at the reduction of 55%. Meanwhile, the deformation specimens' microstructure performance and the effect of passes and annealing temperature on the microstructure and mechanical properties were investigated. Moreover, the ultimate tensile strength (UTS) of CP-Ti is over 760.5 MPa and its elongation is up to 40%. When the annealing temperature is below 400 ℃, the microhardness slightly decreases, but its microstructure changes little. When the annealing temperature is over 400 ℃, because the dislocation density decreases through recovery and causes re-crystallization, and the microhardness decreases markedly.