加工工艺对纯钛冷拉丝材组织和力学性能的影响

Influence of Processing Technology on Microstructures and Mechanical Properties of Pure Titanium Cold Drawing Wire

研究了纯钛丝材冷拉变形量及退火对组织和力学性能的影响。结果表明纯钛坯料在琢区温度进行30%~40%变形,随后在600~800℃退火能矫正过热组织;对于冷拉纯钛坯料,经过一定变形量的加工后采用600~800℃的退火处理,材料能够得到彻底软化,基本接近坯料力学性能;从两种试验方法的金相组织和数据比较中可以发现,当φ6.0 mm热轧态纯钛坯料冷拉至φ4.0 mm即累积变形量达到55.56%后进行中间退火随后继续变形,材料的性能较为稳定。

The influences of cold drawing deformation and the annealing on microstructures and mechanical properties of pure titanium wire were studied. The results show that： the overheating microstructure of the pure titanium blank can be rectified in the deformation of α area with deformation of 30%-40% and then annealing at 600-800℃. For the cold drawing pure titanium blank, the material can be softened completely by adopting the annealing treatment of 600-800℃ after the certain deformation, which closes to the blank mechanical properties basically. Comparing with the metallographic microstructures and data of two kinds of test methods, it is found that when the hot rolling pure titanium blank is cold-drawn from Ф6.0 mm to Фb4.0 mm （accumulated deformation of 55.56%）, and the material is annealed, and then deformation is continued, the property of the material is relatively stable.