TC4合金温变形绝热剪切带研究  

Study on Adiabatic Shear Band of TC4 Alloy During Warm Deformation

作　　者：葛长健[1] 杨新亮[1] 牟哲[1] 

机构地区：[1]西北工业大学材料学院,陕西西安710072

出　　处：《热加工工艺》2013年第19期91-94,共4页Hot Working Technology

摘　　要：基于热模拟压缩试验,研究了TC4合金在中温塑性变形过程中绝热剪切带的形成以及微观组织演化过程。它的变形温度为560～660℃,应变速率为50.0 s-1。结果表明,变形初期材料加工硬化起主要作用,变形后期软化起主导作用,导致流动应力下降,最终变形失稳和绝热剪切带形成。临界应变随着变形温度的升高而增大。绝热剪切带宽度随着变形程度的增大而增加。绝热剪切带内及附近的晶粒沿着剪切方向拉长和扭转。The formation of adiabatic shear band and microstructure evolution of TC4 titanium alloy during warm deformation was studied based on isothermal compression test. Its deformation temperatures were from 560℃ to 660℃ and strain rate was 50.0 s-1. The results show that at the initial stage of deformation, the strain hardening plays an important role in the deformation. Then, thermal softening dominates the deformation process to cause the flow stress decreasing. Finally, the deformation instability and adiabatic shear band form. The critical strain increases with the increasing of deformation temperature. The shear band width increases with the increase of deformation degree. The grain in the adiabatic shear band and adjacent areas is elongated and distorted along the shear direction.

关 键 词：TC4合金 绝热剪切带 中温变形 

分 类 号：TG306[金属学及工艺—金属压力加工]