TC4钛合金高温压缩变形行为与组织演变

利用Gleeble-3500热/力模拟试验机进行不同变形参数(变形温度和应变速率)下的高温热模拟单向压缩试验,对得到的真应力-真应变曲线进行分析,研究了不同变形工艺参数对TC4钛合金单向压缩时真流动应力及其压缩组织的影响。通过对变形后试样的金相组织观察,研究了材料在高温变形过程中的动态再结晶和回复过程。结果表明,流变应力随着应变的增加而迅速增大至最大值,随后开始缓慢降低,最后趋于稳定。随着变形温度升高,晶界破碎化程度逐渐增大,条状组织减少,组织中的次生α相含量逐渐增加。

High Temperature Compression Deformation Behavior and Microstructure Evolution of TC4 Titanium Alloy

High temperature thermal simulation single direction compression experiment was carried out with Gleeble-3500 thermal/mechanical simulation testing machine at varied deformation parameters deformed temperature and strain rate.The true stress-true strain curves obtained were analyzed to understand effects of deformed parameters on flow stress and compressive microstructure of TC4 alloy during single direction compression process.Through observing microstructure of deformed samples,the recrystallization and recovery state of the TC4 alloy were analyzed during high deformation process.The results reveal that flow stress is increased rapidly and then decreased gradually to be stable with increasing in strain.With increasing in deformation temperature,grain boundary is broken increasingly,and strip-like structure is decreased,meanwhile,secondaryαphase in the structure is increased gradually.