锻压技术

变形量对车用冷锻变形Ti-9Al钛合金组织和拉伸性能的影响

英文标题：Influence of cold forging deformation on microstructure and tensile properties of Ti-9Al titanium alloy for car

作者：韩兴言

单位：山西机电职业技术学院

分类号：TG146.2

出版年,卷(期):页码：2019,44(4):157-161

摘要：

对Ti-9Al钛合金试样进行冷锻变形处理，利用 EBSD、TEM 以及力学拉伸等实验手段，分析变形量对其微观组织结构与力学性能造成的影响。研究结果表明：经固溶处理后，棒材中形成了许多大尺寸等轴晶显微组织，未产生变形或剪切带。当变形量为20%时， LAGBs 在合金基体中的比例达到了固溶态比例的 3 倍左右，而当冷锻变形量上升后， LAGBs比例增加速率也变得更慢；当变形量达到60%时，LAGBs的比例从最初的 14%上升为 18%。经变形处理后，Ti-9Al钛合金中的α相在冷锻变形前后从最初的29.2%发生明显的降低，随着冷锻变形量的增加，表现出单调减小的变化规律。随着冷锻变形量的逐渐增大，合金保持一定的塑性，达到60%的冷锻变形量时，依然可以保持6.8%的室温伸长率。

The cold forging deformation treatment to Ti-9Al titanium alloy sample was conducted, and the influences of deformation amount on microstructure and mechanical properties were analyzed by EBSD, TEM and mechanical tensile methods. The results show that many large size isometric crystal microstructures are formed in the bar after solid solution treatment without deformation or shear bands. When the deformation amount is 20%, the proportion of LAGBs in the alloy matrix reaches about three times of the proportion of solid solution state, and the increasing rate of LAGBs proportion becomes slower when the cold forging deformation amount increases, and when the deformation amount reaches 60%, the proportion of LAGBs increases from the original 14% to 18%. After deformation treatment, the α phase in Ti-9Al titanium alloy decreases significantly from the original 29.2% before and after cold forging deformation. With the increasing of cold forging deformation amount, it shows the change law of monotonically decreasing. Furthermore, with the gradual increasing of cold forging deformation amount, the alloy maintains a certain plasticity, and the elongation at room temperature can still remain 6.8% when the cold forging deformation amount reaches 60%.

基金项目：

山西省自然科学基金资助项目(20140321014-02)

韩兴言（1978-）男，硕士，讲师 E-mail：hanquanx533866@126.com

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