考虑摩擦和温升效应的Ti60合金流变曲线修正

Correction of the flow curve of Ti60 alloy considering effectsof friction and heating

摘要:

采用Thermecmaster-Z型热加工模拟试验机对Ti60合金进行等温恒应变速率压缩实验,获得该合金在变形温度700～950℃,应变速率0.001～10s_^-1和真应变0.51条件下的流变曲线,通过考虑摩擦和温升效应对流动应力的影响,对Ti60合金实测流变曲线进行修正。结果表明,摩擦和温升效应对Ti60合金流动应力均具有较显著的影响,且摩擦效应随着应变的增加而增加,而温升效应随着变形温度的降低和应变速率的升高而增加。经摩擦和温升修正后的流变曲线接近于流动稳态型,它能更准确地反映Ti60合金在等温恒应变速率条件下的流动应力对真应变的动态响应。

Abstract:

Thermecmaster-Z thermal processing simulation machine was used to conduct isothermal compression tests on Ti60 alloy, and the flow curves of the alloy were obtained under the conditions of deformation temperature 700 ~ 950℃, strain rate 0.001 ~ 10s-1 and true strain 0.51. The flow curves of Ti60 alloy were corrected by considering the effect of friction and heating on flow stress.The results show that the effectof friction and heatinghas significant influence on the flow stress of Ti60 alloy.The influence of friction increases with the increase of strain, while the influence of heating increases with the decrease of deformation temperature and the increase of strain rate. The flow curve presents flow steady typeafter correctingby the effect of friction and heating,which can more accurately reflect the dynamic response of the flow stress of Ti60 alloy to the true strain.