锻压技术

形变热处理对Fe-19Mn-2Al-0.6C圆钢拉伸性能及组织演变的影响

英文标题：Influence of deformation heat treatment on tensile properties and microstructure evolution for Fe-19Mn-2Al-0.6C round steel

作者：姚斌李峰张国强

单位：浙江农业商贸职业学院浙江理工大学浙江任达机械制造有限公司

关键词：Fe-19Mn-2Al-0.6C圆钢轧制预变形加工硬化双级时效处理微观组织

分类号：TG142

出版年,卷(期):页码：2022,47(8):208-214

摘要：

综合运用轧制预变形以及双级时效处理方法测试了Fe-19Mn-2Al-0.6C圆钢在轧制预变形阶段发生的组织结构与各项力学性能指标的变化。研究结果表明：对预变形试样进行二级时效（SG）处理可以获得更优的加工硬化性能，各试样均表现为相近的加工硬化指数值，均形成了明显的“驼峰形”结构。进行再时效或经过预变形时效处理后，材料的显微组织结构发生了明显改变，在奥氏体中析出许多纳米级M碳化物，形成了由奥氏体与M碳化物组成的固溶组织，M碳化物的粒径增加至Φ6.2 nm，且经过二级时效处理的试样存在一定的回复现象。通过预变形的方法可以在合金组织中形成缺陷，为Q析出相提供异质形核点，使析出相获得不同的析出点位，最终实现对有害相的调控效果。该研究对汽车轻量化用圆钢性能的改进提供了一种很好的研究方向。

The changes of microstructure and mechanical properties of Fe-19Mn-2Al-0.6C round steel during rolling pre-deformation stage were tested by rolling pre-deformation and two-stage aging treatment. The results show that pre-deformed specimens can obtain better work hardening performance by secondary aging (SG) treatment, and all samples show similar work hardening index values and form obvious “hump-shaped” structure. After the re-aging and pre-deformation aging treatment, the microstructure of the material changes obviously. Many nano-scale M carbides are precipitated in austenite to form a solid solution structure composing of austenite and M carbides, and the particle size of M carbides increases to Φ6.2 nm. However, there is a certain recovery phenomenon of the samples after SG treatment. The pre-deformation method can provide heterogeneous nucleation points for Q precipitated phase after forming defects in the alloy structure so that the precipitated phase can obtain different precipitation sites and finally achieve the effect of regulating the harmful phases. This research provides a good research direction for improving the performance of round steel for automobile lightweight.

基金项目：

国家重点研发计划项目(2018YFD0800702)

作者简介：姚斌（1984-），男，硕士，工程师，E-mail：84228825@qq.com

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