摘要
在Gleeble-3500热模拟试验机上采用等温压缩试验研究GH4169合金的高温流变行为,获得GH4169合金在变形温度为850-1050℃、应变速率为0.1-50.0 s^-1条件下的真应力-应变曲线,根据动态材料模型（DMM）建立GH4169合金的热加工图。研究结果表明：GH4169合金在实验条件下具有正的应变速率敏感性,流变应力随着应变速率的增大而增大,随变形温度的升高而减小,该合金的流变应力行为可用Arrhenius方程来描述。在变形温度为850-870℃、应变速率为7.4-50.0 s^-1和变形温度为875-945℃、应变速率为0.1-2.7 s^-1的2个区域内易产生流变失稳现象。GH4169合金安全热加工区域的变形温度在1 000-1 050℃之间、应变速率在0.10-0.34 s^-1之间。
The hot deformation behavior of GH4169 alloy was investigated by hot compressive tests on Gleeble-3500 thermal simulation test machine at the temperature of 850-1 050 ℃ and strain rate of 0.1-50 s^-1. The true stress-strain curves under different deformation conditions were obtained and the processing map was developed based on the dynamic material modeling（DMM）. The results show that the flow stress is sensitive to the strain rate and the deforming temperature. The flow stress becomes higher with the increase of the strain rate at constant temperature and lower with the increase of the deformation temperature at constant strain rate, which can be described by a constitutive equation in the form of Arrhenius function. The flow instability regimes appear at two different regimes： at the temperature of850-870 ℃ and the strain of 7.4-50 s^-1, as well as at the temperature of 875-945 ℃ and the train rate of 0.1-2.7 s^-1. The hot deformation of GH4169 alloy can be carried out safely in the region with temperature of 1 000-1 050 ℃ and strain rate of 0.10-0.34 s^-1.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第11期3752-3761,共10页
Journal of Central South University:Science and Technology
基金
国防科工委军品配套研制资助项目(115-2-948)~~
