• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2024, Vol. 60 ›› Issue (21): 378-386.doi: 10.3901/JME.2024.21.378

• 制造工艺与装备 • 上一篇    下一篇

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超高强度钢激光冲击-超声滚压复合强化试验研究

李泽坤1, 梁志强1, 蔡志海2, 李学志1, 栾晓圣1, 邹世坤3, 李宏伟4, 刘心藜4, 李娟5, 王飞5   

  1. 1. 北京理工大学机械与车辆学院 北京 100081;
    2. 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;
    3. 中国航空制造技术研究院 北京 100024;
    4. 北京北方车辆集团有限公司 北京 100072;
    5. 内蒙古北方重工业集团有限公司 包头 014033
  • 收稿日期:2023-12-10 修回日期:2024-04-13 发布日期:2024-12-24
  • 通讯作者: 梁志强,男,1984年出生,博士,教授,博士研究生导师。主要研究方向为精密磨削、微细刀具设计与制造、超声加工技术、抗疲劳制造技术。E-mail:liangzhiqiang@bit.edu.cn
  • 作者简介:李泽坤,男,1998年出生,博士研究生。主要研究方向为抗疲劳制造技术、材料动态力学行为。E-mail:864797067@qq.com
  • 基金资助:
    浙江省基础公益研究(LGJ22E050002),国家自然科学基金(U2130122,51975533,U22A20199)和装备预研基金教育部联合基金(8091B022215)资助项目。

Experimental Study on Laser Shock Peening and Ultrasonic Surface Rolling Composite Strengthening of Ultra-high Strength Steel

LI Zekun1, LIANG Zhiqiang1, CAI Zhihai2, LI Xuezhi1, LUAN Xiaosheng1, ZOU Shikun3, LI Hongwei4, LIU Xinli4, LI Juan5, WANG Fei5   

  1. 1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081;
    2. National engineering research center for Remanufacturing, Army Academy of Armored Forces, Beijing 100072;
    3. AVIC Manufacturing Technology Institute, Beijing 100024;
    4. Beijing North Vehicle Group Corporation, Beijing 100072;
    5. Inner Mongolia North Heavy Industries Group Co., Ltd., Baotou 014033
  • Received:2023-12-10 Revised:2024-04-13 Published:2024-12-24

摘要: 为了提升超高强度钢(45CrNiMoVA)高承载结构件的疲劳性能,提出激光冲击-超声滚压复合强化方法。开展45CrNiMoVA钢激光冲击-超声滚压复合强化试验,利用SEM、TEM等检测手段,揭示复合强化对超高强度钢表面完整性的影响规律。结果表明,复合强化能够有效降低表面粗糙度,相较于单一的激光冲击强化和超声滚压强化,粗糙度分别下降44.1%和8.3%,其中超声滚压强化的光整效果起到了主要作用;复合强化后表层最大残余压应力达−1 274 MPa,出现在距表面0.2~0.3 mm内,残余压应力影响层深度超过1.4 mm;复合强化后残余应力的分布规律体现出两种工艺相叠加的特点,超声滚压强化的影响层深度约为0.5 mm,即距表面0.5 mm以内,残余应力分布与单一的超声滚压强化类似,距表面0.5 mm以外,残余应力分布与单一的激光冲击强化类似;复合强化后,表层材料出现显著塑性变形,晶粒细化现象明显。证明了激光冲击-超声滚压复合强化方法的有效性,对超高强度钢高承载结构件表面强化技术的发展具有重要意义。

关键词: 激光冲击, 超声滚压, 超高强度钢, 复合强化, 表面完整性

Abstract: In order to improve the fatigue performance of high load-bearing structural parts of ultra-high strength steel (45CrNiMoVA), a composite strengthening method of laser shock peening and ultrasonic surface rolling (LSP-USR) is proposed. A series of experiments including the composite strengthening of laser shock peening and ultrasonic surface rolling are carried out. The influence of composite strengthening on the surface integrity of ultra-high strength steel is revealed by using SEM, TEM and other detection methods. The results show that composite strengthening can effectively reduce surface roughness. Compared with laser shock peening strengthening and ultrasonic surface rolling strengthening, the roughness decreases by 44.1% and 8.3% respectively, and the finishing effect of ultrasonic surface rolling strengthening plays a key role. The maximum residual compressive stress on the surface layer after composite strengthening can reach −1 274 MPa, which appears within 0.2-0.3 mm from the surface, and the depth of the residual compressive stress affected layer exceeds 1.4 mm. The distribution regularity of residual stress after composite strengthening reflects the superposition of two processes, and the depth of the influence layer of ultrasonic surface rolling strengthening is about 0.5 mm. Within 0.5 mm from the surface, the residual stress distribution is similar to that of a single ultrasonic surface rolling strengthening, while beyond 0.5 mm from the surface, the residual stress distribution is similar to that of a single laser shock peening strengthening. After composite strengthening, the surface material exhibits significant plastic deformation and obvious grain refinement. The effectiveness of the composite strengthening method of laser shock peening and ultrasonic surface rolling is proved, which is of great significance to the development of surface strengthening technology of high load-bearing structural parts of ultra-high strength steel.

Key words: laser shock peening, ultrasonic surface rolling, ultra-high strength steel, composite strengthening, surface integrity

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