金属热处理 ›› 2021, Vol. 46 ›› Issue (10): 178-181.DOI: 10.13251/j.issn.0254-6051.2021.10.031

• 工艺研究 • 上一篇    下一篇

中间高温回火工艺对15MnNi4MoA渗碳钢微观组织及性能的影响

高志喆1, 陈小艳1, 程福超1, 李佳康2, 苏盛睿2, 王永金2   

  1. 1.鞍山钢铁集团有限公司大孤山球团厂, 辽宁 鞍山 114004;
    2.北京科技大学 材料科学与工程学院, 北京 100083
  • 收稿日期:2021-04-07 出版日期:2021-10-25 发布日期:2021-12-08
  • 通讯作者: 王永金,讲师,博士,E-mail:wangyongjin@ustb.edu.cn
  • 作者简介:高志喆(1964—),男,教授级高工,主要研究方向为矿山设备与工艺,E-mail:1119898759@qq.com
  • 基金资助:
    中央高校基本科研业务费资助项目(FRF-TP-18-039A1);北京市优秀人才培养资助青年骨干个人项目(2018000020124G065)

Influence of intermediate high-temperature tempering process on microstructure and properties of carburized 15MnNi4MoA steel

Gao Zhizhe1, Chen Xiaoyan1, Cheng Fuchao1, Li Jiakang2, Su Shengrui2, Wang Yongjin2   

  1. 1. Dagushan Pelleting Plant of Anshan Group Co., Ltd., Anshan Liaoning 114004, China;
    2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2021-04-07 Online:2021-10-25 Published:2021-12-08

摘要: 研究了15MnNi4MoA钢渗碳后的热处理工艺对其微观组织及性能的影响。设计了3种不同的渗碳后热处理工艺:淬火+低温回火、一次高温回火+淬火+低温回火、两次高温回火+淬火+低温回火,并对热处理后的力学性能及微观组织进行了对比和分析。通过扫描电镜对3种不同热处理后的显微组织和冲击断口形貌进行了观察。同时,对不同热处理工艺的试样进行了维氏硬度和常温冲击吸收能量(U型缺口)检测。结果表明,经3种不同的热处理后,试样的微观组织差异不大,均为马氏体+残留奥氏体组织。其中,经两次高温回火处理所得到的试样,马氏体组织更加细小,力学性能更加突出,心部硬度降低至358 HV,表面硬度提高到664 HV,常温冲击吸收能量达到143 J。

关键词: 渗碳后热处理, 高温回火, 马氏体, 冲击性能, 表面硬度

Abstract: Effect of heat treatment process on microstructure and properties of the carburized 15MnNi4MoA steel was studied. Three different post-carburizing heat treatment processes were designed, i.e.: quenching+low temperature tempering, once high temperature tempering+quenching+low temperature tempering and twice high temperature tempering+quenching+low temperature tempering, and the mechanical properties and microstructure of the tested steel after heat treatment were compared and analyzed. The microstructure and impact fracture morphologies of the tested steel after heat treatment were observed by means of scanning electron microscope. At the same time, the Vickers-hardness and impact absorbed energy (U-notch) at room temperature of the specimens under different heat treatment processes were tested. The results show that after heat treatment, the microstructure of the all specimens has little difference, which is martensite+retained austenite. The specimen treated by twice high temperature tempering treatment has a finer martensite structure and better mechanical properties. The core hardness is reduced to 358 HV, the surface hardness is increased to 664 HV, and the impact absorbed energy at room temperature reaches 143 J.

Key words: post-carburizing heat treatment, high-temperature tempering, martensite, impact property, surface hardness

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