Abstract: By using Gleeble-3500 thermal mechanical simulator, deformation resistance of 150 mm casting slab of 0. 47C-0. 36Si-0. 67Mn medium carbon steel with strain 0. 1 ~0. 6 and strain rate 10 ~ 20 s^-1 at 650 ~920℃ in single pass axial compression process is tested and studied, and a math model for deformation resistance of test steel at lower temperature is established. Results show that with decreasing temperature. increasing strain and strain rate, the deformation resistance of test steel increases: in deformation at less than 700℃ , due to occurrence of dynamic ferrite phase transformation, as work-hardening and dynamic phase transformation softening are going to balance the maximum value of deformation resistance occurs on curves, later with increasing deformation-inducetl ferrite amount the deformation resistance decreases. The calculated value conforms to measured value, the error of forecasting deformation value is ± 13. 76 MPa.

摘要： 用Gleeble-3500热模拟试验机对0.47C-0.36Si-0.67Mn中碳钢150 mm连铸板坯在650～920℃、变形量0.1～0.6、变形速率10～20 s^-1单道次轴向压缩时的变形抗力进行试验和研究,并建立了实验钢在低温下的变形抗力数学模型。结果表明,随温度降低,变形速率和变形量增加,试验钢变形抗力增加:在700℃以下变形时,由于发生动态铁素体相变,当加工硬化同动态相变软化达到平衡时曲线出现变形抗力极值,而后随形变诱导铁素体量的增加,变形抗力下降预报值与实测值相符,变形抗力的预报精度为±13.76 MPa。

关键词: 0.47C-0.36Si-0.67Mn中碳钢, 连铸板坯, 热模拟, 低温轧制, 变形抗力, 数学模型