• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2022, Vol. 58 ›› Issue (12): 111-120.doi: 10.3901/JME.2022.12.111

• 材料科学与工程 • 上一篇    下一篇

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超声滚压工艺对模具钢激光熔覆层表面质量的影响

郑开魁1,2, 林有希2, 蔡建国3, 雷成迁2   

  1. 1. 福州大学先进制造学院 晋江 362200;
    2. 福州大学机械工程及自动化学院 福州 350108;
    3. 福州大学机电工程实践中心 福州 350108
  • 收稿日期:2021-11-25 修回日期:2022-04-03 出版日期:2022-06-20 发布日期:2022-09-14
  • 通讯作者: 林有希(通信作者),男,1967年出生,博士,教授,博士研究生导师。主要研究方向为摩擦学和先进制造技术。E-mail:lyx@fzu.edu.cn
  • 作者简介:郑开魁,男,1986年出生,博士,副教授,硕士研究生导师。主要研究方向为机械工程、摩擦学、金属材料加工和增材制造。E-mail:kuikui@fzu.edu.cn
  • 基金资助:
    国家自然科学基金(51975123)、福建省自然科学基金(2020J05115)、福州市科技计划(2020-PT-148)和泉州市科技计划(2020C043R)资助项目

Effect of Ultrasonic Rolling Process on Surface Quality of Laser Cladding Layer of Die Steel

ZHENG Kaikui1,2, LIN Youxi2, CAI Jianguo3, LEI Chengqian2   

  1. 1. School of Advanced Manufacturing, Fuzhou University, Jinjiang 362200;
    2. School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108;
    3. Mechanical and Electrical Engineering Practice Center, Fuzhou University, Fuzhou 350108
  • Received:2021-11-25 Revised:2022-04-03 Online:2022-06-20 Published:2022-09-14

摘要: 超声滚压技术是一种经济高效的新型表面光整强化工艺,可有效提高金属表面的质量。采用激光熔覆技术在H13模具钢表面涂覆铁基合金,研究了超声滚压工艺参数对激光熔覆层表面微观结构与质量的影响。利用SEM、EDS和XRD研究了滚压表层的微观结构;利用表面粗糙度仪、白光干涉仪、硬度计和残余应力测试仪研究了滚压表面的粗糙度、硬度和残余应力。研究结果表明,熔覆层经超声滚压后表层显微组织细化明显,晶粒随着距表面深度的增加而逐渐增大,组织形变方向与超声滚压方向相同。滚压后的表面粗糙度与初始表面粗糙度成正相关关系。随着压下量、静压力、滚压速率和滚压次数的增加,表面粗糙度先减小后增大,表面硬度先增加后降低;表面残余应力随压下量、静压力和滚压次数的增加先增后减。压下量0.10 mm、静压力0.45~0.65 MPa、滚压速率2 100 mm/min、滚压次数3时,金属表面可获得良好的光整强化效果。

关键词: 超声滚压, 激光熔覆, 模具钢, 微观形貌, 表面质量

Abstract: Ultrasonic rolling technology is an economic and efficient means, and a new surface finishing and strengthening technique which can effectively improve the quality of metal surface. H13 die steel was coated with iron base alloy by laser cladding technology, and the effect of ultrasonic rolling process parameters on the surface microstructure and quality of laser cladding layer were investigated. SEM, EDS and XRD were carried out to study the microstructure of the rolled surface, and surface roughness instrument, white light interferometer, hardness tester and residual stress tester were performed to measure their roughness, hardness and residual stress. The results show that the microstructure of the cladding layer was refined obviously after ultrasonic rolling. The grain size increases gradually with the increase of the depth from the surface, and the direction of microstructure deformation is the same as that of ultrasonic rolling. The surface roughness after rolling has a linear positive correlation with the initial surface roughness. With increasing reduction, static pressure, rolling rate and rolling times, the surface roughness decreases first and then increases, and the surface hardness increases first and then decreases. The surface residual stress increases first and then decreases with the increase of reduction, static pressure and rolling times. The metal surface has a good finishing and strengthening effect at the value of reduction of 0.10 mm, static pressure of 0.45-0.65 MPa, rolling rate of 2 100 mm/min and rolling times of 3.

Key words: ultrasonic rolling, laser cladding, die steel, micro morphology, surface quality

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