• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2023, Vol. 59 ›› Issue (4): 34-42.doi: 10.3901/JME.2023.04.034

• 材料科学与工程 • 上一篇    下一篇

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超高强度钢热场-超声复合滚压表层微观组织强化机制

栾晓圣1, 梁志强2, 赵文祥2, 肖世宏1,3, 周天丰2, 王西彬2, 李宏伟4, 刘心藜4, 刘珍妮4   

  1. 1. 北京理工大学机械与车辆学院 北京 100081;
    2. 北京理工大学先进加工技术国防重点学科实验室 北京 100081;
    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
  • 收稿日期:2022-03-16 修回日期:2022-05-20 出版日期:2023-02-20 发布日期:2023-04-24
  • 通讯作者: 梁志强(通信作者),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切削磨削、微细刀具设计与制造、抗疲劳制造技术。E-mail:liangzhiqiang@bit.edu.cn
  • 作者简介:栾晓圣,男,1992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:1156781343@qq.com
  • 基金资助:
    国家重点研发计划(2019YFB1311100)、基础科研(JCKY2021208B046)和国家自然科学基金(51975053)资助项目。

Microstructure Strengthening Mechanism of Surface Layer of Ultra-high Strength Steel by Thermal Assisted Ultrasonic Rolling

LUAN Xiaosheng1, LIANG Zhiqiang2, ZHAO Wenxiang2, XIAO Shihong1,3, ZHOU Tianfeng2, WANG Xibin2, LI Hongwei4, LIU Xinli4, LIU Zhenni4   

  1. 1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081;
    2. Key Laboratory of Fundamental Science for Advanced Machining, Beijing Institute of Technology, Beijing 100081;
    3. AVIC Manufacturing Technology Institute, Beijing 100024;
    4. Beijing North Vehicle Group Corporation, Beijing 100072
  • Received:2022-03-16 Revised:2022-05-20 Online:2023-02-20 Published:2023-04-24

摘要: 针对超高强度钢冷塑性变形能力弱、表面形变强化难度大的问题,提出热场-超声复合滚压强化方法。开展45CrNiMoVA钢表面热场-超声复合滚压试验,利用SEM、EBSD和TEM等检测手段,结合表面层残余应力分布结果,表征、分析表层微观组织的演变与强化机制。发现在声软化效应和热软化效应耦合作用下,热场-超声复合滚压后45CrNiMoVA钢表层材料的塑性变形程度加剧,塑性变形层深度增加,表层材料发生晶粒细化,形成沿深度方向晶粒尺寸呈梯度分布的微观组织结构,细晶强化和位错强化是主要的强化机制。证明了热场-超声复合滚压方法的有效性,对超高强度钢零件表面强化处理技术的发展具有重要意义。

关键词: 热场-超声复合滚压, 超高强度钢, 微观组织, 表面强化

Abstract: To deal with the problems of poor cold plastic deformation ability and difficult surface deformation strengthening of ultra-high strength steel, a thermal assisted ultrasonic rolling surface strengthening method is proposed. The surface thermal assisted ultrasonic rolling test of 45CrNiMoVA steel was carried out. The evolution and strengthening mechanism of surface microstructure were characterized and analyzed by SEM, EBSD, and TEM, combined with the residual stress distribution results of the surface layer. It is found that under the coupling effect of acoustic softening and thermal softening, the plastic deformation degree of 45CrNiMoVA steel surface material is intensified, the depth of plastic deformation layer is increased, the grain refinement of surface material occurs, and the microstructure with gradient distribution of grain size along the depth direction is formed. Fine-grain strengthening and dislocation strengthening are the main strengthening mechanisms. The effectiveness of the thermal assisted ultrasonic rolling method is proved, which is of great significance to the development of surface strengthening technology of ultra-high strength steel parts.

Key words: thermal assisted ultrasonic rolling, ultra-high strength steel, microstructure, surface strengthening

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