锻压技术

304不锈钢的热变形行为及热加工图

英文标题：Hot deformation behavior and hot processing map on 304 stainless steel

作者：张志红1 刘洁1 2

分类号：TG335.8

出版年,卷(期):页码：2024,49(11):202-209

摘要：

采用Gleeble-3800试验机对304不锈钢进行热压缩试验，变形温度为900~1200 ℃，应变速率为0.01~1 s-1，热压缩试验完成后迅速水冷。对304不锈钢的真应力-真应变曲线进行分析，结果表明，304不锈钢的真应力-真应变曲线的类型包括动态回复+动态再结晶曲线和动态再结晶曲线，并且流动应力随变形温度的升高和应变速率的降低而减小。根据真应力-真应变数据构建了应变补偿的Arrhenius本构模型，相关系数为0.9932，相对误差为6.849%。此外，根据真应力-真应变数据，确定了不同温度下各应变速率的功率耗散因子η和失稳参数ξ(ε·)，进而构建了304不锈钢的热加工图。根据热加工图确定了304不锈钢的最佳加工范围为变形温度为940~1200 ℃、应变速率为0.01~1 s-1。

The hot compression test of 304 stainless steel was carried out by Gleeble-3800 testing machine under the deformation temperature of 900-1200 ℃ and the strain rate of 0.01-1 s-1, and it was quickly water-cooled after the hot compression test. The analysis results of the true stress-true strain curve for 304 stainless steel shows that the types of true stress-true strain curves include dynamic recovery+dynamic recrystallization curve and dynamic recrystallization curve, and the flow stress decreases with the increasing of deformation temperature and the decreasing of strain rate. A strain-compensated Arrhenius constitutive model is constructed based on the true stress-true strain data, with the correlation coefficient of 0.9932 and the relative error of 6.849%. In addition, based on the true stress-true strain data, power dissipation factor η and the instability parameter ξ(ε·)of each strain rate at different temperatures are determined, and then the hot processing map of 304 stainless steel is constructed. According to the hot processing map, the optimal processing range for 304 stainless steel is the temperature of 940-1200 ℃ and the strain rate of 0.01-1 s-1.

基金项目：

2023年山西省高等学校教学改革创新项目（J20231722）；2023年山西省高等学校教学改革创新项目（J20231720）；2022年山西省教育科学“十四五”规划项目（GH-220338）；2023年山西省高等学校科技创新项目（2023L513）

作者简介：张志红（1985-），女，硕士，副教授 E-mail：574055042@qq.com

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