TC17钛合金β锻造工艺对显微组织的影响

The effect of β forging process on microstructure morphology of TC17 alloy

摘要:

本文通过Φ100×150mm圆柱镦粗试验研究了TC17钛合金β锻造工艺对微观组织形貌的影响。结果表明：变形量和下压速率对显微组织有显著的影响。当变形速率较低时,晶界α相容易被破碎,变形量越大,被破碎越严重,越容易被球化。当变形速率较高时,β晶粒容易发生动态再结晶,变形量越大,再结晶体积分数越高。采用Image Pro Plus对球化率和再结晶体积分数进行了统计。结果表明晶界α相的球化条件对变形量和下压速率均较为苛刻,仅在变形量为80%,变形速率为0.1mm/s时发生了大量晶界α相球化。此外,相比变形量,β再结晶数量对变形速率更加敏感。

Abstract:

In this study, the effect of β forging process on microstructure morphology was studied by compressing test for TC17 alloy. The results show that the height reduction and the rate of deformation have a significant effect on the microstructure at the compression test. When the rate of deformation was low, the grain boundary α phase was easily broken. And the larger the deformation was, the easier grain boundary α phases were to be globularized, which have been severely broken. When the rate of deformation was high, the β grains were prone to dynamic recrystallization. And the larger the the deformation was, the higher the recrystallization volume fraction was. The Image Pro Plus software was used to estimate the globularizaion rate of grain boundary α phase and the volume fraction of β grain recrystallization. The results show that the grain boundary α phase could be globularized only in some strict conditions. The α phases were globularized only at the height reduction of 80% and deformation rate of 0.1 mm/s in this study. In addition, β grain recrystallization was more sensitive to the deformation rate, compared with the height reduction.