变形量对Ti-55531钛合金微观组织和力学性能的影响

Influence of deformation amount on microstructure and mechanical properties for Ti-55531 titanium

为了进一步优化Ti-55531钛合金的锻造过程,分析了变形量对其微观组织和力学性能的影响。通过不同变形量下的镦粗实验,分析了Ti-55531钛合金锻后的微观组织,并对锻后样品进行了β退火+时效热处理,最后进行了拉伸测试。结果表明,随着变形量的增加,Ti-55531钛合金中初生α相的体积分数逐渐下降,热处理后初生α相消失,微观组织以次生α相为主。Ti-55531钛合金的平均强度随着变形量的增加逐渐下降,而其塑性随着变形量的增加逐渐增加,结合企业生产标准,同时为了避免各向异性,应将变形量范围控制在30%~50%。

In order to further optimize the forging process of Ti-55531 titanium alloy,the influences of deformation amount on microstruc-ture and mechanical properties were analyzed,and the microstructure of Ti-55531 titanium alloy after forging was analyzed by upsetting ex-periments under different deformation amounts.Then,βannealing and aging heat treatment were carried out on the samples after forging,and the tensile experiment was carried out.The results show that with the increasing of deformation amount,the volume fraction of primaryαphase for Ti-55531 titanium alloy decreases gradually.After heat treatment,primaryαphase disappears,and the microstructure is dom-inated by secondaryαphase.The average strength of Ti-55531 titanium alloy gradually decreases with the increasing of deformation amount,and the plasticity gradually increases with the increasing of deformation amount.In order to avoid anisotropy,the deformation amout range should be controlled at 30%-50%combined with the enterprise production standard.