Qing WANG
金属学报(英文版)
The true stress-true strain curves of Ti-6Al-2Zr-1Mo-1V alloy with hydrogen were obtained by hot compression test. The microstructures of the alloy before and after thermo-compression were observed. The apparent activation energies of deformation were calculated for the alloy with and without hydrogen. The behavior and mechanism of deformation for hydrogenated Ti-6Al-2Zr-1Mo-1V alloy at high temperature were analyzed. The relationship between hydrogenation time and hydrogen content at 800 ℃ can be expressed as the equation: CH(t)=1.2-1.2exp(-t/120). The true stress-true strain curves of hot compression for Ti-6Al-2Zr-1Mo-1V alloy with hydrogen first move down and then move up as hydrogen content increases. Appropriate hydrogen content can reduce the peak of flow stress to minimal value. The apparent activation energies of deformation of the alloy with 0.47% hydrogen content and without hydrogen were calculated as 140 kJ•mol-1 and 390,kJ•mol-1, respectively, at 800 ℃ and at strain rate 8.3×10-4 s-1. The apparent activation energy of deformation increases when the strain rate enhances from 8.3×10-4 s-1 to 8.31×0-2 s-1.
关键词:
Titanium alloy
,
hydrogenising treatment
,
compression at high temperature
,
apparent activation energy of deformation
,
microstructure.
刘婵桢
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2015.05.010
基于热模拟机GLEEBLE1500,以AZ31为研究对象进行热压缩实验,获得材料的应力-应变曲线.用金相显微镜对不同温度及应变速率下的金相进行观察分析,并对比分析热压缩前后的微观组织.同时分析了不同温度及应变速率下材料的力学行为,其行为属于典型的动态再结晶型.当热压缩温度为350℃和400℃时,材料强度随应变速率增大而增大,且加工硬化也增大.当应变速率为0.01和0.1/s时,随着变形温度的升高,材料的应力逐渐降低.在不同温度下,应变速率为0.01/s时的应力比应变速率为0.1/s时的应力要低.
关键词:
AZ31
,
热变形行为
,
微观组织
,
应变速率
,
变形温度
