摘要
基于Gleeble-3500热模拟实验,分析了AISI-1035钢分别在不同热压缩温度(1073,1173,1273 K)、不同热压缩速率(0.3,3.0 s-1)下的变形流动规律及微观组织演变规律,并建立了AISI-1035钢在1073~1273 K下的双多元非线性回归本构模型。实验结果表明:AISI-1035钢的应力幅值随着变形温度的升高以及应变速率的降低而减小;不同变形条件下的应力应变曲线在经过峰值应力后均出现了软化现象,并且高应变速率下动态再结晶的发生使得应力软化比较显著;高应变速率下诱发的局部温升导致应力幅值上升缓慢,从而使得峰值应变水平提升。微观组织分析结果表明:较高的应变速率诱发的局部温升以及动态再结晶促使AISI-1035钢的晶粒尺寸差异较大,热压缩变形温度越高,晶粒粗大现象越明显。所建立的模型预测趋势与实验数据比较吻合,能够较好地反映AISI-1035钢在1073~1273 K下的流动特性。
Based on Gleeble-3500 thermal simulation experiment,the deformation,flow and microstructure evolution of AISI-1035 steel under different hot compression temperatures(1073,1173,1273 K)and different hot compression rates(0.3,3.0 s-1)were analyzed,and the bimultivariate nonlinear regression constitutive model of AISI-1035 steel under 1073~1273 K was established.The results show that the stress amplitude of AISI-1035 steel decreases with the increase of deformation temperature and the decrease of strain rate.The stress-strain curves under different deformation conditions all softened after the peak stress,and the stress softening was obvious at high strain rate due to the occurrence of dynamic recrystallization.The local temperature rise induced at high strain rates causes the stress amplitude to rise slowly and the peak strain level to increase.The results of microstructure analysis show that the local temperature rise induced by higher strain rate and dynamic recrystallization promote the grain size difference of AISI-1035 steel.The higher the hot compression deformation temperature,the more obvious the grain coarsening phenomenon.The predicted trend of the model is in good agreement with the experimental data,which can better reflect the flow characteristics of AISI-1035 steel at 1073~1273 K.
作者
张荣新
Zhang Rongxin(SAIC Motor Corporation Limited,Shanghai 201800,China)
出处
《农业装备与车辆工程》
2022年第2期72-78,共7页
Agricultural Equipment & Vehicle Engineering
