锻压技术

Ti-6Al-4V合金多道次温轧过程中微观组织对力学性能的影响

英文标题：Influence of microstructure on mechanical properties during multi-pass warm rolled Ti-6Al-4V

作者：凌敏

单位：贵州理工学院

分类号：TG304

出版年,卷(期):页码：2015,40(11):127-131

摘要：

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。

High strength bulk ultrafine-grained titanium alloy Ti-6Al-4V bars with 12 mm diameter and several meters long were successfully produced by multi-pass warm rolling at different temperatures (650, 700 and 750 ℃). The research shows that when the rolling temperature is 650 ℃,Ti-6Al-4V bars is of the best mechanical properties, namely, the yield strength is 1200 MPa, the tensile strength is 1300 MPa, and the elongation is 10%. The alloys microstructure and its evolution process in the forming were observed by optical microscopy, electron back scattered diffraction (EBSD) and X-ray diffraction. The result shows that the ultra fine-grained microstructure and the morphology of α and β phases after the warm rolling play an important role in improving alloys mechanical properties. Further, the cost and time of small diameter bar products can be saved by multi-pass warm rolling, and the efficiency can be improved.

基金项目：

贵州理工学院自然科学基金资助项目（XJZK20130807）

凌敏（1981-），女，硕士，副教授

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