加工工艺对TA10大规格棒材力学性能的影响

Effect of processing method on mechanical properties of TA10 large-section bars

本文采用不同的锻造工艺分别生产不同氧含量TA10钛合金大规格棒材，对其组织及性能进行了对比研究。发现间隙元素氧含量对大规格棒材室温塑性影响很大，随着氧含量的增加，严重的晶格畸变强烈阻碍位错运动，增加强度的同时严重降低材料塑性。此外，随着锻造温度的降低，两相区变形程度增加，可获得均匀细小的等轴组织，该组织具有良好的综合力学性能。实验结果表明：由于氧含量与锻造工艺的不同，导致同规格棒材组织性能存在较大差异。合理控制氧含量，并采用低温大变形锻造工艺生产的大规格TA10钛合金棒材晶粒尺寸可以控制在35μm以内，且综合力学性能优异。

The large size bars of TA10 titanium alloy have been produced by the different oxygen contents and forging processes respectively. And the microstructure and mechanical properties of the TA10 bars have been comparativly studied. It is found that the oxygen content of interstitial elements has great influence on the room temperature plasticity of the large size bar. With the increase of the oxygen content, serious lattice distortion hindered the movement of dislocation, which enhanced the intensity as well as reduced the plastic property seriously. In addition, with the decline of the forging temperature, the deformation degree of two phases zone increased. In this method, even fine equiaxed grains can be obtained. The microstructure has good comprehensive mechanical properties. The experimental results showed that there are biggish differences in microstructure and mechanical performances among the same specification TA10 titanium bars because of the difference of oxygen content and forging processes. By controlling oxygen content reasonably and using the large deformation forging process at low temperature in the production of large size TA10 titanium alloy bars, the grain size can be achieved within 35 microns and the bars have excellent comprehensive mechanical properties.