锻压技术

铸态ER8钢高温塑性变形行为及热加工图

英文标题：High temperature plastic deformation behavior and hot processing map on as-cast ER8 steel

单位：1.太原科技大学材料科学与工程学院 2. 太原科技大学山西省大型铸锻件工程技术研究中心 3. 太原重工轨道交通设备有限公司技术中心

分类号：TG314.4

出版年,卷(期):页码：2023,48(8):224-230

摘要：

在Gleeble-1500D热力模拟试验机上，以0.001~1 s-1的应变速率和900~1250 ℃的温度对铸态ER8钢进行了单轴热压缩试验，得到了流动应力曲线，并基于此，建立了热加工图，详细地分析了温度和应变率对材料热加工性能的影响。结果表明：在变形温度为900~1250 ℃、应变速率为0.001~1 s-1范围内，铸态ER8钢的流动应力曲线为动态再结晶型曲线，仅当变形温度低于900 ℃、应变速率高于1 s-1时，流动应力曲线具有明显的动态回复型曲线的特征。结合ER8钢的热加工图分析可知，为了防止高温塑性变形失稳，在锻造时变形温度应大于950 ℃；当应变为0.20时，应变速率建议小于0.05 s-1。

The uniaxial hot compression test of as-cast ER8 steel at the strain rate of 0.001-1 s-1 and the temperature of 900-1250 ℃ was carried out by thermal simulation testing machine Gleeble-1500D, and the hot processing map was established based on the obtained flow stress curve. Then the influences of temperature and strain rate on the hot workability of material were analyzed in detail. The results show that in the deformation temperature range of 900-1250 ℃ and the strain rate range of 0.001-1 s-1, the flow stress curve of as-cast ER8 steel is a typical dynamic recrystallization curve. Only when the deformation temperature is lower than 900 ℃ and the strain rate is higher than 1 s-1, the flow stress curve has obvious characteristics of dynamic recovery curve. According to the analysis of the hot processing map of as-cast ER8 steel, in order to prevent the instability of high temperature plastic deformation, the deformation temperature during forging should be greater than 950 ℃, and when the strain is 0.20, the strain rate is recommended to be less than 0.05 s-1.

基金项目：

山西省重点研发计划重点项目（201703D111005）；太原科技大学科研启动基金资助项目（20222051）

作者简介：陈飞（1990-），男，博士，讲师,E-mail：chenf@tyust.edu.cn

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