锻压技术

深冲压用高强度钢45K-DDQ的峰值应力模型探讨

英文标题：Discussion on peak stress model of high strength steel 45K-DDQ when deep drawing

作者：王立冬周旭东

单位：河南科技大学

分类号：TG142.7

出版年,卷(期):页码：2012,37(5):150-154

摘要：

采用热力模拟试验机Gleeble1500D，在变形温度为950~1200℃、应变速率为0.01~15s-1以及最大变形程度为60%的条件下，对深冲压用高强度钢45K-DDQ做单道次压缩实验。分析了不同参数对流变应力的影响，重点结合不同应力模型的特点和最佳使用范围，探讨了应力模型使用范围对模型精度的影响；用回归法确定了应力模型中的变形激活能及材料常数，得到45K-DDQ钢在峰值应力条件和稳态应力条件下的变形激活能分别为318.975和 288.397 kJ·mol-1，最后得到了高精度的流变峰值应力模型，平均相对误差为1.572%，相关系数R为0.9989。

To analyze the effects of different parameters on the flow stress, the single-pass compression experiments were carried out with deep drawing high strength steel 45K-DDQ specimens using a Gleeble1500D thermal simulator at the temperature range of 9501200℃ and strain rate range of 0.01~15s-1 under the condition of maximum deformation of 60%. Considering and combining the characteristics and best application range of the different stress models, the average deformation activation energy under the peak stress and steady-state stress conditions with the regression method were obtained. And they are respectively 318.975kJ·mol-1 and 288.397kJ·mol-1. Finally, the rheological peak stress model was got. The mean relative error is 1.572%, the related coefficient R is 0.9989.

基金项目：

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