热变形温度对82B盘条变形抗力的影响

Effect of Deformation Temperature on Deformation Resistance of SWRH82B Steel

通过在Gleeble-1500热/力模拟实验机上的热压缩实验,研究了不同热变形条件下SWRH82B盘条的变形抗力.由所得数据,确定钢样的应力-应变曲线,分析了变形温度对变形抗力的影响,结果表明,在选定变形程度范围0.3～0.8内,变形温度从860℃升至1110℃过程中,不同变形程度的变形抗力明显减小;当变形速率分别为0.1,1,10,40s-1时,变形抗力随变形温度的增大而减小;当变形温度为860,910,960,1010,1060,1110℃时,变形抗力减小趋势随变形速率增大而趋于平缓;建立了82B盘条变形抗力与变形温度关系模型为:σ=162.6283exp(-2.28815T+8.04316),拟合精度达99%以上.

The deformation resistance of SWRH82B steel during hot deformation was studied with Gleeble-1500 thermal simulator.The stress-strain curves were drawn,and the effect of deformation temperature on its deformation resistance was analyzed.The results showed that under the conditions of varied fixed deformation degrees from 0.3 to 0.8,deformation resistance decreased obviously with the increase of deformation temperature from 860 to 1110℃.When the deformation rate was 0.1,1,10 and 40 s-1,respectively,the higher the deformation temperature,the less the deformation resistance.When the deformation temperatures were 860,910,960,1010,1060 and 1110℃,respectively,there was a mild decline in deformation resistance with the increase of deformation rate.The relationship between deformation temperature and deforming resistance of 82B wire rod was established,σ=162.6283exp（-2.28815T＋8.04316）,and the fitting accuracy reached above 99%.