论文部分内容阅读
采用Gleeble-1500D热模拟机模拟高温压缩实验,研究奥氏体不锈钢06Cr19Ni9NbN在900~1200℃、应变速率0.005~0.5s-1变形条件下的热变形行为,通过对实验数据的分析,得到了该钢的流动应力曲线,高温塑性本构方程,热变形激活能,建立了06Cr19Ni9NbN钢动态再结晶动力学模型和动态再结晶晶粒尺寸模型,为优化高温条件下的锻造加工工艺提供理论依据。结果表明,当变形温度越高、变形速率越小时,越易发生动态再结晶,同时在能够发生动态再结晶的条件下,变形量越大,动态再结晶越充分。
The hot deformation behavior of austenitic stainless steel 06Cr19Ni9NbN at 900-1200 ℃ and strain rate of 0.005-0.5 s-1 was studied by using Gleeble-1500D thermal simulator to simulate high-temperature compression. Based on the experimental data, The flow stress curve of steel, the high temperature plastic constitutive equation and the thermal deformation activation energy, the dynamic recrystallization kinetics model and the dynamic recrystallization grain size model of 06Cr19Ni9NbN steel were established, which provided a theoretical basis for optimizing the forging process under high temperature conditions. The results show that the higher the deformation temperature, the smaller the deformation rate, the more prone to dynamic recrystallization, while dynamic recrystallization can occur, the greater the deformation, the more dynamic recrystallization.