金属热处理 ›› 2021, Vol. 46 ›› Issue (9): 247-251.DOI: 10.13251/j.issn.0254-6051.2021.09.044

• 表面工程 • 上一篇    下一篇

激光冲击对690高强钢表面完整性的影响

曹晨1, 黄春玲2, 曹宇鹏1,2, 杨阳3, 杨聪1   

  1. 1.南通大学 机械工程学院, 江苏 南通 226019;
    2.江苏五星波纹管有限公司, 江苏 泰州 225300;
    3.南通振华重型装备制造有限公司, 江苏 南通 226017
  • 收稿日期:2021-04-22 出版日期:2021-09-25 发布日期:2021-12-09
  • 通讯作者: 曹宇鹏,副教授,博士,E-mail:cyp19812004@ntu.edu.cn
  • 作者简介:曹 晨(1994—),男,硕士研究生,主要研究方向为激光加工,E-mail:2418012350@qq.com。
  • 基金资助:
    国家自然科学基金(51505236);南通市基础科学研究项目(JC2018029)

Effect of laser shocking on surface integrity of 690 high strength steel

Cao Chen1, Huang Chunling2, Cao Yupeng1,2, Yang Yang3, Yang Cong1   

  1. 1. School of Mechanical Engineering, Nantong University, Nantong Jiangsu 226019, China;
    2. Jiangsu Five Star Bellows Co., Ltd., Taizhou Jiangsu 225300, China;
    3. Nantong Zhenhua Heavy Equipment Manufacturing Co., Ltd., Nantong Jiangsu 226017, China
  • Received:2021-04-22 Online:2021-09-25 Published:2021-12-09

摘要: 为研究激光冲击处理对690高强钢表面完整性的影响,采用不同功率密度的脉冲激光冲击690高强钢试样,借助光学轮廓仪、X射线应力仪、硬度计和透射电镜,测试分析激光冲击前后690高强钢试样的表面三维形貌、硬度、残余应力和微观组织的变化。结果表明:不同功率密度的激光冲击后,690钢的表面粗糙度增大;随着激光功率密度的增加,试样表面轮廓的最大高度Ry从1.814 μm增至3.247 μm。不同功率密度的激光冲击后,试样残余应力均值由-122 MPa增加至-296 MPa,显微硬度的均值由277 HV0.1 增加至355 HV0.1。与未进行激光冲击强化试样相比,激光冲击处理使690高强钢试样表层晶粒不断细化,且功率密度越大表层晶粒尺寸越小。

关键词: 690高强钢, 激光冲击, 表面强化, 微观组织, 残余应力

Abstract: In order to study the effect of laser shocking treatment on the surface integrity of 690 high strength steel, pulsed lasers with different power densities were used to shock the steel specimens. With the help of optical profiler, X-ray stress meter, hardness tester and transmission electron microscope, the surface three-dimensional morphology, hardness, residual stress and microstructure of the 690 high strength steel before and after laser shocking were measured and analyzed. The results show that after laser shocking with different power densities, the surface roughness of the specimen increases; with the increase of laser power density, the maximum height Ry of the specimen surface profile increases from 1.814 μm to 3.247 μm. After laser shocking with different power densities, the average residual stress of the specimen increases from -122 MPa to -296 MPa, and the average microhardness increases from 277 HV0.1 to 355 HV0.1. Compared with the specimen without laser shocking, the laser shocking treatment makes the surface grains of the 690 high strength steel continue to be refined, and the greater the power density, the smaller the surface grain size of the steel.

Key words: 690 high strength steel, laser shocking, surface strengthening, microstructure, residual stress

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