孙建,黄贞益,李景辉,王萍

• 1:安徽工业大学冶金工程学院
• 2:铜陵学院机械工程学院

摘要(Abstract)：

采用Gleeble1500D热模拟实验机对Fe-28Mn-9Al-1C轻质合金钢在温度为900～1100℃和应变速率为0.01～5 s~(-1)范围内进行了热压缩实验，建立了其本构模型，分析了实验钢组织演化规律和变形机制。结果表明：实验钢流动应力对变形温度呈现负温度敏感性，对应变速率呈现出正应变速率敏感性，即流动应力随变形温度的升高而降低，随应变速率的增大而增大，流动应力峰值最大值达523 MPa。经计算，实验钢平均热变形激活能Q为364271.45 J/mol,表观应力指数(n)为4.049,本构方程为：■。实验钢的动态再结晶平均晶粒尺寸随变形温度的升高和应变速率的降低而增大，高温低应变速率有利于实验钢动态再结晶的发生。

关键词(KeyWords)： 轻质合金钢;热变形;本构方程;组织演化

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51674004,51805002)

作者(Author): 孙建,黄贞益,李景辉,王萍

DOI: 10.13289/j.issn.1009-6264.2021-0269

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