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基于定量金相学原理,结合有限元模拟技术,定量研究了TC17钛合金在等温锻造过程中片层α取向随应变量的变化规律。分析发现:当应变量小于0.38时,片层α的取向呈对称双峰分布,两峰值之间夹角约为60°,表明片层α具有择优取向,微观组织保持原始的网篮特征;随着应变量的增大,片层α的取向分布出现不对称双峰现象,某一峰值取向参数角的体积分数变大,两峰值之间的夹角变小,网篮组织被不同程度的打碎;当应变量达到0.77左右,片层α取向呈近似单峰分布,取向参数角在80°～90°附近的体积分数达到最大,片层α趋向垂直于压缩轴分布。
Based on the principle of quantitative metallography and the finite element simulation technique, the variation of α orientation of the sheet with the amount of strain during the isothermal forging process of TC17 titanium alloy was quantitatively studied. The results show that when the strain is less than 0.38, the orientation of lamella α is symmetrical bimodal with the angle between the two peaks being about 60 °, indicating that the lamella α has the preferred orientation and the microstructure maintains the original basket characteristics. With the increase of strain, asymmetric bimodal distribution appears in the orientation distribution of sheet α, the volume fraction of a peak orientation parameter angle becomes larger and the angle between two peaks becomes smaller, and the basket structure is hit by different degrees When the strain reaches about 0.77, the α orientation of the lamellae is approximately unimodal distribution, the volume fraction of the orientation parameter angle reaches the maximum near 80 ° ~90 °, and the lamella α tends to be perpendicular to the compression axis.