李强,陈学文,周正,刘铭阳,徐栋栋,毛怡然

• 1:河南科技大学材料科学与工程学院

摘要(Abstract)：

为了优化SA508 Gr.3 Cl.1钢(以下简称SA508钢)的热锻工艺参数，采用Gleeble-1500D热-力模拟试验机，在温度为950～1200℃(间隔50℃)、应变速率为0.005～0.1 s~(-1)的条件下对其进行热压缩试验。基于试验数据，结合动态材料模型和Prasad失稳准则，构建了其二维热加工图，并进一步扩展为包含应变量的三维热加工图，以更准确地揭示温度、应变速率和应变量对SA508钢热变形行为的影响。结果表明：SA508钢的真应力-应变曲线呈现出典型的动态再结晶型曲线特性，其流动应力随温度升高或应变速率降低而降低；应变量对SA508钢的成形性有较大影响，随着应变量的增加，功率耗散系数呈现逐渐上升的趋势，失稳区域的占比逐步下降；SA508钢的最佳热变形条件为应变量大于0.5,应变速率为0.03～0.1 s~(-1),温度为1075～1150℃。

关键词(KeyWords)： SA508 Gr.3 Cl.1钢;动态再结晶;动态材料模型;三维热加工图

Abstract:

Keywords:

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

作者(Author): 李强,陈学文,周正,刘铭阳,徐栋栋,毛怡然

DOI: 10.13289/j.issn.1009-6264.2024-0551

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