锻压技术

TC18钛合金等高温压缩过程的组织性能

英文标题：Microstructure and properties of isothermal high-temperature compression process for titanium alloy TC18

作者：徐杰肖铁忠黄娟

分类号：TG306

出版年,卷(期):页码：2017,42(1):111-115

摘要：

为了研究TC18钛合金在等高温压缩过程中组织与性能的变化，以Gleeble-1500热模拟试验机进行等高温压缩试验，计算得到所有试样的单向压缩膨胀系数均大于0.9，验证了热压缩试验的有效性。通过控制变量法研究不同变形温度和应变速率对其力学性能以及微观组织的影响，结果表明：TC18钛合金等高温热压缩时，流变应力随着变形温度的升高而降低，随着应变速率的增大而增大；而随着温度和应变速率的增加，组织中的初生等轴α相和次生针状α相逐渐发生相变而消失，β相逐渐长大形成粗大的β晶粒组织，并伴随有动态回复和动态再结晶两种软化机制。

In order to study the changes of the microstructure and properties for titanium alloy TC18 in the isothermal high-temperature compression process, the isothermal high-temperature compression experiment was carried out by Gleeble-1500 thermal simulation testing machine, and the axial compressive expansion coefficients of all specimens were calculated to be greater than 0.9. Therefore, the validity of the thermal compression test was verified. Then, the influences of different deformation temperatures and strain rates on mechanical properties and microstructure changes were researched by variable-control method. The results show that the flow stress of titanium alloy TC18 decreases with increasing of deformation temperature, and increases with increasing of strain rate in the isothermal high-temperature compression process. However, with increasing of temperature and strain rate, the primary equiaxed α-phase and secondary acicular α-phase gradually disappear due to phase change, while the β phase gradually grows and forms coarse grains with two kinds of softening mechanisms of dynamic recovery and dynamic recrystallization.

基金项目：

四川省教育厅科研项目(16ZB0495)

徐杰（1981-），男，硕士，副教授 E-mail：593712861@qq.com

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