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.
出处
《锻压技术》
CAS
CSCD
北大核心
2015年第11期127-131,共5页
Forging & Stamping Technology
基金
贵州理工学院自然科学基金资助项目(XJZK20130807)
