• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2026, Vol. 62 ›› Issue (9): 332-342.doi: 10.3901/JME.260425

• 数字化设计与制造 • 上一篇    

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超高强钢深滚压-预扭复合强化表面完整性研究

梁志强1, 李学志1, 张鹏2, 杜宇超1, 蔡志海3, 李泽坤1, 刘国强2, 王成4   

  1. 1. 北京理工大学机械与车辆学院 北京 100081;
    2. 内蒙古第一机械集团有限公司工艺研究所 包头 014030;
    3. 陆军装甲兵学院机械产品再制造国家工程研究中心 北京 100072;
    4. 陆军装备部北京地区军事代表局 北京 100072
  • 收稿日期:2025-06-02 修回日期:2025-11-01 发布日期:2026-07-08
  • 作者简介:梁志强,男,1984年出生,博士,教授,博士研究生导师。主要研究方向为抗疲劳制造技术、精密磨削、微细刀具设计与制造。E-mail:liangzhiqiang@bit.edu.cn;杜宇超(通信作者),男,1992 年出生,博士后。主要研究方向为抗疲劳制造技术、机器人智能制造、微细刀具设计与制造。E-mail:dycfelix@163.com
  • 基金资助:
    内蒙古科技重大专项(2020ZD0027)和基础科研(2021208B046)资助项目。

Study on Surface Integrity of Ultra-high Strength Steel by Deep Rolling and Pre-torsion Composite Strengthening

LIANG Zhiqiang1, LI Xuezhi1, ZHANG Peng2, DU Yuchao1, CAI Zhihai3, LI Zekun1, LIU Guoqiang2, WANG Cheng4   

  1. 1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081;
    2. Inner Mongolia First Machinery Group Co., Ltd., Baotou 014030;
    3. National engineering research center for Remanufacturing, Army Academy of Armored Forces, Beijing 100072;
    4. Beijing Military Representative Bureau, Army Equipment Department, Beijing 100072
  • Received:2025-06-02 Revised:2025-11-01 Published:2026-07-08

摘要: 为了提升超高强钢在极端工况载荷作用下的抗疲劳寿命,提出了深滚压-两角度预扭复合强化方法。利用共聚焦显微镜、背散射电子衍射和透射电镜等检测手段,揭示深滚压-预扭耦合作用下超高强钢表面完整性的形成和微观组织强化机制。发现复合强化有效提升了残余压应力强化层深度,深滚压-13.7°/7.71°预扭强化层深度达到1.2 mm,出现了明显的“第二强化层”,最大周向残余压应力为-535 MPa,出现在距表面0.3 mm处。复合强化促进了表层晶粒细化和位错增殖,深滚压后大小角度组合的预扭工艺相较于单一角度预扭工艺,晶粒尺寸减小、几何必须位错密度增加,表层微观组织结构沿深度方向呈梯度分布。证明了深滚压-两角度预扭强化方法的有效性,对难加工超高强钢材料表面强化技术发展具有重要意义。

关键词: 深滚压, 预扭, 超高强钢, 微观组织, 表面强化

Abstract: In order to improve the fatigue life of ultra-high strength steel under extreme load conditions, the composite strengthening method of deep rolling and two-angle pre-torsion was proposed. The formation of surface integrity and the strengthening mechanism of the microstructure of ultra-high strength steel under the coupling action are revealed by confocal microscopy, electron back scatter diffraction (EBSD), and transmission electron microscope (TEM). It is found that under the composite strengthening, the depth of the reinforced layer of residual compressive stress was improved, and the depth of the deep rolling and 13.7°/7.71° pre-torsion strengthening layer reached 1.2 mm, and an obvious "second reinforced layer" appeared, and the maximum circumferential residual compressive stress is -535 MPa, which appeared at 0.3mm from the surface. The grain refinement and dislocation multiplication in the surface layer are promoted. Compared with the single-angle pre-torsion, the combination of large and small angles pre-torsion after deep rolling reduced the grain size and increased the density of geometrically necessary dislocation. The surface layer microstructure is distributed in a gradient along the depth direction. The effectiveness of the two-angle pre-torsion after deep rolling method is proved, which is of great significance to the development of surface strengthening technology for hard-to-machine ultra-high strength steel parts.

Key words: deep rolling, pre-torsion, ultra-high strength steel, microstructure, surface strengthening

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