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

参考文献：

[1]贺良国, 赵杰, 谷先广. 基于多胞结构的车身前端轻量化和耐撞性设计[J]. 汽车工程, 2020, 42(6): 832-839，846.

He L G, Zhao J, Gu X G.Lightweight and crashworthiness design of vehicle body front-end based on multi-cell structure[J].Automotive Engineering, 2020, 42(6): 832-839，846.

[2]徐建全, 杨沿平. 基于Vensim的汽车轻量化全生命周期动态评价[J]. 计算机集成制造系统, 2020, 26(4): 954-969.

Xu J Q, Yang Y P. Dynamic evaluation of lightweight automotive life cycle based on Vensim software [J]. Computer Integrated Manufacturing Systems, 2020, 26(4): 954-969.

[3]张健, 谢禹琳. 某微型电动商用车车架轻量化优化研究[J]. 机电工程, 2020, 37(3): 283-287.

Zhang J, Xie Y L. Optimization of lightweight frame for a micro-electric commercial vehicle [J]. Journal of Mechanical & Electrical Engineering, 2020, 37(3): 283-287.

[4]Chen S P, Rana R, Haldar A, et al. Current state of Fe-Mn-Al-C low density steels [J]. Progress in Materials Science, 2017, 89: 345-391.

[5]潘雪新, 常红, 李忠文, 等. 激光淬火对高速动车组EA4T车轴钢组织和性能的影响[J]. 金属热处理, 2020, 45(5): 161-165.

Pan X X, Chang H, Li Z W, et al. Influence of laser quenching on structure and property of EA4T axle steel for high-speed EMU [J]. Heat Treatment of Metals, 2020, 45(5): 161-165.

[6]夏源. 车用退火态Fe-24Mn-4Cr-0.5C高锰钢力学性能和氢脆性能分析[J]. 锻压技术, 2020, 45(4): 184-188.

Xia Y. Analysis on mechanical and hydrogen embrittleness properties of annealed Fe-24Mn-4Cr-0.5C high manganese steel for vehicle [J]. Forging & Stamping Technology, 2020, 45(4): 184-188.

[7]赵伟章, 刘生. 氧化时间对乙醇助燃车用82B钢氧化形貌的影响[J]. 兵器材料科学与工程, 2019, 42(5): 82-85.

Zhao W Z, Liu S. Effect of oxidation time on oxidation morphology of 82B steel for ethanol combustion supporting[J]. Ordnance Material Science and Engineering, 2019, 42(5): 82-85.

[8]Zambrano O A. A general perspective of Fe-Mn-Al-C steels [J]. Journal of Materials Science, 2018, 53(20): 14003-14062.

[9]Ren P, Chen X P, Chen Z X, et al. Synergistic strengthening effect induced ultrahigh yield strength in lightweight Fe-30Mn-11Al-1.2C steel [J]. Material Science & Engineering, 2019, 752:160-166.

[10]李海, 毛庆忠, 王芝秀, 等. 预时效+冷轧变形+再时效对6061铝合金组织和力学性能的影响[J]. 金属学报, 2014, 50(10): 1244-1252.

Li H, Mao Q Z, Wang Z X, et al. Effect of the thermo-mechanical treatment of pre-aging,cold rolling and re-aging on microstructures and mechanical properties of 6061 Al alloy [J].Acta Metallurgica Sinica, 2014, 50(10): 1244-1252.

[11]张南南. 变形与热处理组合工艺对6061铝合金组织和性能的影响[D]. 镇江：江苏大学，2017.

Zhang N N. Effect of Combined Process of Deformation and Heat Treatment on Microstructure and Properties of 6061 Aluminum Alloy [D]. Zhenjiang：Jiangsu University, 2017.

[12]Yao M J, Welsch E, Ponge D, et al. Strengthening and strain hardening mechanisms in a precipitation-hardened high-Mn lightweight steel [J]. Acta Materialia, 2017, 140: 258-273.

[13]Lee K, Park S J, Kang J Y, et al. Investigation of the aging behavior and orientation relationships in Fe-31.4Mn-11.4Al-0.89C low-density steel [J]. Journal of Alloys and Compounds, 2017, 723:146-156.

[14]徐从昌, 孙朝蓉, 于婉玉, 等. 轻量化车身用AlMgSi合金时效工艺及强化相析出行为研究进展[J]. 塑性工程学报,2019，26(4): 9-18.

Xu C C, Sun C R, Yu W Y, et al. Research progress on aging process and precipitation behavior of AlMgSi alloy used for lightweight vehicle body [J]. Journal of Plasticity Engineering, 2019,26 (4): 9-18.

[15]孙大翔, 董宇, 叶凌英, 等. 形变热处理工艺对2519A铝合金动态变形行为的影响[J]. 材料工程, 2021, 49(2): 79-87.

Sun D X, Dong Y, Ye L Y, et al. Effect of thermo-mechanical treatments on dynamic deformation behaviors of 2519A aluminum alloy[J]. Journal of Materials Engineering, 2021, 49(2): 79-87.

[16]任平, 陈兴品, 王存宇, 等. 预变形和双级时效对Fe-30Mn-11Al-1.2C奥氏体低密度钢显微组织和力学性能的影响[J]. 金属学报, 2022, 58(6): 771-780.

Ren P, Chen X P, Wang C Y, et al. Effect of pre-strain and two-step aging on microstructure and mechanical properties of Fe-30Mn-11Al-1.2C austenitic low-density steel [J]. Acta Metallurgica Sinica, 2022, 58(6): 771-780.

服务与反馈：

【文章下载】【加入收藏】