S34MnV钢的高温压缩变形行为实验

针对大型船用曲轴曲拐所用材料S34Mn V合金钢,利用Gleeble-3800热模拟实验机对其进行高温压缩实验,研究了S34Mn V合金钢在变形温度为950~1250℃、应变速率为0.001~10 s-1和压缩变形量为70%条件下的高温变形行为,得到了其真实应力-应变曲线。分析了变形温度、应变速率对S34Mn V合金钢高温流变行为的影响。结果表明,变形温度和应变速率对流动应力影响显著,流动应力随变形温度升高而下降,随应变速率增大而上升;低的应变速率、高的变形温度,更易于动态再结晶的发生,有利于降低流动应力。

Experiment on hot compression behaviors of S34MnV alloy steel

For alloy steel S34MnV used in the manufacture of large marine crankshaft,the hot compression experiment was carried out by the Gleeble-3800 thermal simulation test machine.Then,deformation behaviors of alloy steel S34MnV were researched at 950~1250 ℃,strain rate of 0.001~10 s-1 and compression deformation of 70%,and the true stress-true strain curves were gained.In addition,the influences of deformation temperature and strain rate on rheological behavior of alloy steel S34MnV were analyzed.The results show that deformation temperature and strain rate have significant influences on the flow stress.The flow stress decreases with the rising of deformation temperature and increases with the increasing of strain rate.When the strain rate is lower and deformation temperature becomes higher,the dynamic recrystallization occurs easily and is helpful to reduce the flow stress.