316LN钢高温流动应力与动态再结晶模型

Modeling of flow stress and dynamic recrystallization for 316LN steel during hot deformation

利用Gleeble热模拟压缩实验，研究316LN奥氏体不锈钢在温度950℃～1250℃、应变速率0．001s-1～1．0s-1下的高温变形特征，并测得相应的流动应力曲线。对实验数据进行计算拟合，建立加工硬化一动态回复和动态再结晶“两阶段”高温流动应力模型、动态再结晶百分数及晶粒尺寸模型。将所建模型写入有限元软件进行数值模拟，其结果与实验吻合，说明该模型准确可靠，可用于316LN热变形过程的数值模拟。

Based on the Gleeble hot compression tests, the hot deformation property and flow stress curves of 316LN stainless steel were investigated under the temperature range 950℃～1250℃ and strain rate 0. 001s-1--1.0s-1. By regression on the ex perimental data, a ＂Two-stage＂ flow stress model, a dynamic recrystallization volume fraction and grain size model of 316LN were established. Moreover, these models were integrated into the numerical simulation software. The simulation results were compared with the experimental data, which proves the validity of the models. Those models can be applied to numerical simula tion for 316LN during hot deformation process.