TA15钛合金高温压缩变形行为与组织研究

Mechanical Behavior and Microstructure of TA15 Titanium Alloy during Hot Compressive Deformation

采用圆柱试样在Gleeble3500型热模拟机上对TA15钛合金进行等温热压缩实验研究。通过实验获得了该种材料在不同工艺参数下的真应力-应变曲线以及其变形过程中的微观组织形貌,并采用电子背散射衍射(EBSD)技术对TA15合金的热压缩变形织构进行研究。实验结果表明,TA15钛合金在高温变形时,其他工艺参数相同下,变形温度降低,应变速率升高,流动应力升高。变形过程中,在相变点以下,软化机制以动态再结晶为主,相变点以上软化机制主要以动态回复为主。不同变形条件下分别存在再结晶织构和形变织构。

High temperature compression tests of TA15 titanium alloy were carried out on Gleeble-3500 simulator. The Experimental results include the true stress - true strain curves and microstructure transition of TA15 alloy under different process parameters,and the textures were investigated by electron baekscattered electron diffracometry （EBSD）. The results reveal that the flow stress decreases with deformation temperature rising and increases with strain rate growing. Strong textures are achieved and the main softening mechanism is dynamic recrystallization below β transition, and dynamic recovery is in field.