锻压技术

低合金钢Q345E高温热变形行为及动态再结晶图

英文标题：Hot deformation behavior and dynamic recrystallization diagram for low-alloy Q345E steel at high temperature

作者：李佳张秀芝刘建生

分类号：TG316

出版年,卷(期):页码：2013,38(4):148-151

摘要：

应用Gleeble-1500D 热模拟试验机对低合金高强度结构钢(HLSA)Q345E进行高温单道次热压缩试验，研究了不同变形参数(变形温度T、变形速率和变形量ε)下Q345E钢的变形抗力，分析了各变形参数对该钢变形抗力和动态再结晶的影响。结果表明：随着应变速率的提高和变形温度的降低，Q345E钢的流变应力显著增大；在应变速率较低、高温时，易发生动态再结晶；在应变速率较高、低温时，不发生动态再结晶。建立了Q345E 钢热态变形过程中的高温塑性本构方程和动态再结晶图，为科学设计和有效控制Q345E 钢的成形工艺提供理论依据。

The single-pass compression experimental investigation on the high strength low alloy (HLSA) Q345E steel was carried out using thermal-mechanical testing machines Gleeble-1500D at high temperature. The deformation resistance of Q345E steel under different parameters, such as temperature, strain rate and strain was measured, and the influences of different deformation parameters on the dynamic recrystallization and deformation resistance were analyzed also. It is shown that the flow stress of Q345E steel grows significantly with the increasing of strain rate and decreasing of deformation temperature. When the tests are carried out under low strain rate at higher temperature, there will be dynamic recrystallization. However, there will be no dynamic recrystallization under high strain rate at lower test temperature. Based on the test results, the dynamic recrystallization diangram and the plastic constitutive equation of Q345E steel during hot deformation are established, which provide theoretic basis for the scientific design and effective controlling the forming procedure of the steel.

基金项目：

太原市科技资助项目(120224)

李佳(1986-), 男, 硕士研究生

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