刘丙旗,陈学文,周旭东,尹丹青,皇涛

• 1:河南科技大学材料科学与工程学院
• 2:龙门实验室

摘要(Abstract)：

为了控制40CrMnMoA合金钢在热变形后的微观组织，研究了该合金钢的动态再结晶行为。采用Gleeble-1500D热-机械模拟压缩试验机在900～1200℃、0.005～5 s~(-1)条件下对40CrMnMoA合金钢进行了高温压缩试验，获得了该合金钢的应力应变曲线。基于试验数据，确定了该合金钢的Zener-Hollomon参数(Z参数)及变形激活能Q=325397.448 J/mol。结果表明：在低lnZ(<30)条件下40CrMnMoA合金钢的应力应变曲线有明显的下降趋势，lnZ越小，该特点越明显，是典型的动态再结晶型曲线。在高lnZ(>30)条件下40CrMnMoA合金钢的应力随着应变的增加不断上升，呈现出典型的动态回复特性。基于试验数据，计算了40CrMnMoA合金钢的加工硬化率θ,通过分析低ln Z条件下的θ-σ曲线，获得了40CrMnMoA合金钢的临界应变和峰值应变，建立了对应的动态再结晶临界应变模型为ε_c=0.0010988Z~(0.19324)。

关键词(KeyWords)： 40CrMnMoA合金钢;高温压缩;Z参数;动态再结晶;临界应变模型

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目(2020YFB2008400)

作者(Author): 刘丙旗,陈学文,周旭东,尹丹青,皇涛

DOI: 10.13289/j.issn.1009-6264.2023-0002

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