冷塑性变形及退火工艺对Ti45Nb合金组织和性能的影响

Effects of cold deformation and annealing process on microstructure and properties of Ti45Nb alloy

采用辊模拉拔技术对Ti45Nb合金丝材进行冷变形,利用OM、EBSD以及拉伸试验等手段研究了冷塑性成形和退火工艺对Ti45Nb合金丝材微观组织和力学性能的影响规律。结果表明,随着冷变形量的增加,Ti45Nb合金丝材的晶粒尺寸逐渐减小,晶粒的取向密度指数逐渐增强,<110>丝织构占据主导地位。同时,Ti45Nb合金丝材的抗拉强度和屈服强度逐渐升高,但是剪切强度无明显变化。采用水冷的方式可以显著提高退火后Ti45Nb合金丝材的塑性,防止顶锻试验开裂。Ti45Nb合金丝材完全再结晶温度为670℃左右,随着退火温度升高,晶粒尺寸明显长大,抗拉强度和屈服强度呈现出上升趋势。

Cold deformation of Ti45Nb alloy wire was carried out using roller die drawing technology.The effects of cold plastic forming and annealing process on microstructure and mechanical properties of the Ti45Nb alloy wire were studied by means of OM,EBSD and tensile test.The results indicate that with the increase of cold deformation,the grain size of the Ti45Nb alloy wire gradually decreases,the orientation density index of the grains gradually increases,and the<110>silk texture dominates.At the same time,the tensile strength and yield strength of the Ti45Nb alloy wire gradually increase,but its shear strength does not change significantly.The use of water cooling can significantly improve the plasticity of the annealed Ti45Nb alloy wires and prevent cracking during compression deformation.The complete recrystallization temperature of the Ti45Nb wire is around 670℃.As the annealing temperature increases,the grain size significantly increases,and the tensile strength and yield strength show an upward trend.