金属热处理 ›› 2023, Vol. 48 ›› Issue (7): 157-161.DOI: 10.13251/j.issn.0254-6051.2023.07.027

• 工艺研究 • 上一篇    下一篇

20Si2Mn2CrNi钢锻后晶粒细化及强韧性提升工艺

李世文1, 熊伟2, 张文亮3, 王超4, 高占勇1   

  1. 1.内蒙古科技大学 材料与冶金学院, 内蒙古 包头 014010;
    2.陆军装备部驻包头地区第一军事代表室,内蒙古 包头 014030;
    3.内蒙古自治区特种设备检验研究院包头分院, 内蒙古 包头 014010;
    4.鄂尔多斯电力冶金集团, 内蒙古 鄂尔多斯 016100
  • 收稿日期:2023-01-06 修回日期:2023-05-29 出版日期:2023-07-25 发布日期:2023-09-04
  • 通讯作者: 高占勇,教授,博士,E-mail:15804722665@163.com
  • 作者简介:李世文(1998—),男,硕士研究生,主要研究方向为低合金高强钢强韧化机理与工艺,E-mail:1787152160@qq.com。

Grain refinement and strength-toughness improvement process of 20Si2Mn2CrNi steel after forging

Li Shiwen1, Xiong Wei2, Zhang Wenliang3, Wang Chao4, Gao Zhanyong1   

  1. 1. School of Materials Metallurgy, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
    2. The First Military Representative Office of the Army Armament Department Stationed in Baotou Area, Baotou Inner Mongolia 014030, China;
    3. Inner Mongolia Special Equipment Inspection and Research Institute Baotou Branch, Baotou Inner Mongolia 014010, China;
    4. Ordos Electric Power Metallurgical Group, Ordos Inner Mongolia 016100, China
  • Received:2023-01-06 Revised:2023-05-29 Online:2023-07-25 Published:2023-09-04

摘要: 研究了Si-Mn-Cr-Ni系低合金高强钢锻件在不同热处理工艺下的显微组织和力学性能。结果表明,试验钢经820 ℃正火后,锻件组织细化效果较好且分布均匀,再经920 ℃淬火和280 ℃低温回火后,其硬度为43.9 HRC,冲击吸收能量KV2为82.6 J,抗拉强度为1513.35 MPa,屈服强度为1221.92 MPa,伸长率为14.65%,此时组织为回火板条马氏体且晶粒尺寸细小,晶粒度为8.3级,达到最佳的强韧性匹配,试验钢的综合力学性能最优。

关键词: 低合金高强钢, 热处理工艺, 显微组织, 晶粒尺寸, 力学性能

Abstract: Microstructure and mechanical properties of Si-Mn-Cr-Ni low alloy high strength steel under different heat treatment processes were studied. The results show that when normalized at 820 ℃, the microstructure of the tested steel is fine and evenly distributed, when followed by quenching at 920 ℃ and tempering at 280 ℃, the hardness of the steel is 43.9 HRC, the impact absorbed energy KV2 is 82.6 J, the tensile strength is 1513.35 MPa, the yield strength is 1221.92 MPa and the elongation is 14.65%. Moreover, the microstructure is tempered lath martensite with fine grain size of grade 8.3,which achieves the best strength-toughness matching and the best comprehensive mechanical properties.

Key words: low alloy high strength steel, heat treatment process, microstructure, grain size, mechanical properties

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