S32654超级奥氏体不锈钢压缩热变形中流动行为的本构模型
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摘要
利用Gleeble-3008热模拟机研究了S32654超级奥氏体不锈钢在950~1 250℃、应变速率为0.001~10 s~(-1)条件下的热压缩变形行为,并建立该材料的热变形本构模型。结果表明:变形温度和应变速率对S32654超级奥氏体不锈钢的流变应力影响显著;流变应力随温度升高而减小,随应变速率增加而增大。温度高于1 150℃、应变速率小于0.1 s~(-1)时钢的应力曲线较平稳,在10 s~(-1)的高应变速率时流变曲线出现动态软化现象。S32654超级奥氏体不锈钢的热变形本构模型预测值与实验值吻合较好。
The hot deformation behavior of superaustenitic stainless steel S32654 was investigated by hot compression tests using Gleeble-3800 thermal simulator at the temperature of 950~1 250 ℃ and the strain rates of 0.001 s~(-1)~10 s~(-1). A constitutive equation for superaustenitic stainless steel S32654 at high temperature compression was established. The results show that the influence of temperature and strain rate on the flow stress of the steel is significant. The flow stress decreases with the increase of temperature and the decrease of strain rate. Above 1 150 ℃, at the strain rate of lower than 0.1 s~(-1), the flow curves exhibit nearly steady state behavior, while at the higher strain rate of 10 s~(-1), continuous flow softening occurs.The flow stress predicted by the model is in agreement with the experimental values.
The hot deformation behavior of superaustenitic stainless steel S32654 was investigated by hot compression tests using Gleeble-3800 thermal simulator at the temperature of 950~1 250 ℃ and the strain rates of 0.001 s~(-1)~10 s~(-1). A constitutive equation for superaustenitic stainless steel S32654 at high temperature compression was established. The results show that the influence of temperature and strain rate on the flow stress of the steel is significant. The flow stress decreases with the increase of temperature and the decrease of strain rate. Above 1 150 ℃, at the strain rate of lower than 0.1 s~(-1), the flow curves exhibit nearly steady state behavior, while at the higher strain rate of 10 s~(-1), continuous flow softening occurs.The flow stress predicted by the model is in agreement with the experimental values.
引文
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