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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。
The ECAP temperature deformation of 6 passes of industrial pure titanium BC was successfully achieved by using a die with two included angles of Φ = 90 ° and outside ψ of 20 °. The cumulative equivalent true strain reached about 6.3, and ECAP temperature deformation test After the sample, the commercial pure titanium after ECAP temperature deformation of each pass was subjected to cold rolling deformation of 55% reduction. At the same time, the microstructure and properties of the deformed samples were observed and analyzed. The thermal stability of ECAP samples was also studied. The results show that after 6 passes of ECAP deformation, the tensile strength of commercial pure titanium reaches 760 MPa and the elongation is 40%. When the annealing temperature is lower than 400 ℃, the microstructure of the ECAP specimens does not change much and the microhardness decreases slowly. When the annealing temperature is higher than 400 ℃, the microhardness decreases remarkably due to recrystallization.