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通过多道次温轧工艺,在650,700和750℃下成功制备出直径为Φ12 mm、长为数米的高强度超细晶Ti-6Al-4V合金棒材。研究结果表明,轧制温度为650℃时Ti-6Al-4V合金棒材具有最佳的力学性能,屈服强度和抗拉强度分别为1200和1300 MPa,伸长率为10%。通过光学显微镜、电子背散射衍射和X-射线衍射对变形过程中的合金微观组织和织构演变进行了观测。结果显示,温轧后的超细晶组织及α和β相对提高合金的力学性能有重要的作用,表明多道次温轧工艺可以有效地节约小尺寸棒材的生产成本和时间,从而提高效益。
Through the multi-pass warm rolling process, the high-strength ultrafine-grained Ti-6Al-4V alloy bar with diameter of 12 mm and length of several meters was successfully prepared at 650, 700 and 750 ℃. The results show that Ti-6Al-4V alloy has the best mechanical properties at 650 ℃, yield strength and tensile strength are 1200 and 1300 MPa respectively, and the elongation is 10%. The microstructure and texture evolution of the alloy during deformation were observed by optical microscope, electron backscatter diffraction and X-ray diffraction. The results show that the ultrafine-grained microstructure and α and β after warm-rolling have an important role in improving the mechanical properties of the alloy, indicating that the multi-pass warm rolling process can effectively reduce the production cost and time of the small-sized bar and thus improve the efficiency .