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利用Gleeble-3800热模拟试验机对超低碳13Cr-5Ni-2Mo马氏体不锈钢进行单道次高温压缩试验,研究其在900～1 200℃、0.1～50s-1条件下的热变形行为,并讨论了不同变形条件下的微观组织演变规律;基于Sellars双曲正弦模型构建了超低碳13Cr-5Ni-2Mo马氏体不锈钢的高温流变应力本构方程。研究结果表明,变形温度越高、应变速率越低,则流变应力越小,峰值应变也越小,微观组织由动态回复型向动态再结晶型转变,并且晶粒逐渐长大、粗化。在高温区变形,随着应变速率的升高,动态再结晶晶粒明显细化。所建立的本构方程具有较高的精确度,能反映超低碳13Cr-5Ni-2Mo马氏体不锈钢的高温变形力学行为,可为热加工数值模拟研究提供参考。
Single-stage high-temperature compression tests were carried out on the ultra-low carbon 13Cr-5Ni-2Mo martensitic stainless steel with a Gleeble-3800 thermal simulation machine to study the thermal deformation behavior of the ultra-low carbon 13Cr-5Ni-2Mo martensitic stainless steel at 900-1 200 ℃ and 0.1-50 s- The microstructure evolution of the ultra-low carbon 13Cr-5Ni-2Mo martensitic stainless steel was discussed based on Sellars hyperbolic sine model. The results show that the higher the deformation temperature is, the lower the strain rate is. The smaller the flow stress is, the smaller the peak strain is. The microstructure changes from dynamic recovery to dynamic recrystallization, and the grains grow up and coarsen gradually. Deformation in the high temperature zone, with the strain rate increases, the dynamic recrystallization grain refinement. The established constitutive equation has high accuracy and can reflect the high-temperature deformation mechanical behavior of ultra-low carbon 13Cr-5Ni-2Mo martensitic stainless steel, which can provide reference for the numerical simulation of thermal processing.