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山东大学学报(工学版) ›› 2018, Vol. 48 ›› Issue (1): 57-64.doi: 10.6040/j.issn.1672-3961.0.2017.504

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40Cr曲面基体激光熔覆W6Mo5Cr4V2性能

许明三1,3,王涛1,3,李剑峰2*,戴腾运1,3   

  1. 1. 福建工程学院机械与汽车工程学院, 福建 福州 350118;2. 山东大学机械工程学院可持续制造研究中心, 山东 济南 250100;3. 福建工程学院先进制造生产力促进中心, 福建 福州 350118
  • 收稿日期:2017-10-12 出版日期:2018-02-20 发布日期:2017-10-12
  • 通讯作者: 李剑峰(1963— ),男,山东邹平人,教授,博士,主要研究方向为绿色制造关键共性技术与装备. E-mail: ljf@sdu.edu.cn E-mail:xums368@163.com
  • 作者简介:许明三(1974— ),男,福建仙游人,副教授,硕士,主要研究方向为激光增材制造、硬脆材料加工. E-mail:xums368@163.com
  • 基金资助:
    国家重点基础研究发展计划资助项目(2011CB013401);国家自然科学基金资助项目(51575110);福建省自然基金资助项目(2015J01628)

Performance of W6Mo5Cr4V2 laser cladding on 40Cr curved substrate

XU Mingsan1,3, WANG Tao1,3, LI Jianfeng2*, DAI Tengyun1,3   

  1. 1. School of Mechanical &
    Automotive Engineering, Fujian University of Technology, Fuzhou 350118, China;
    2. School of Mechanical Engineering, Shandong University, Jinan 250100, China;
    3. Advanced Manufacturing Productivity Promotion Center, Fujian University of Technology, Fuzhou 350118, China
  • Received:2017-10-12 Online:2018-02-20 Published:2017-10-12

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摘要： 为了利用激光熔覆技术实现模切机刀辊刀刃的增材制造,以曲率半径、熔覆轨迹、搭接率等为影响因素,在40Cr曲面基体上进行W6Mo5Cr4V2粉末的多道激光熔覆正交试验研究,并对熔覆层的残余应力、显微硬度以及显微组织结构进行分析。结果表明,保护气流量对残余应力变化影响显著,当工艺参数为激光功率1 800 W、扫描速度10 m/s、保护气流量400 g/min、曲率半径60 mm、搭接率30%、周向熔覆时,残余应力达到最小值。当残余应力满足成形要求时,显微组织的结晶形态从熔覆层顶部到结合区由平面晶向树状晶发展,熔覆层没有缺陷且与基体实现了良好的冶金结合。同时,显微硬度值从基体到熔覆层顶部呈阶梯状增长式分布,熔覆层的显微硬度平均值均在60HRC以上,满足模切机刀辊刀刃的硬度要求。

关键词: 显微硬度, 激光熔覆, 曲率半径, 显微组织, 残余应力

Abstract: In order to realize the additive manufactured on the blade edges of die-cutting machines by using laser cladding technology,orthogonal tests of multi-pass laser cladding with high-speed steel powder W6Mo5Cr4V2 on the curved substrate 40 Cr were carried out. Process parameters which included the radius of curvature,cladding trajectory and the lap-over ratio, etc. were taken as the influencing factors. The residual stress, micro-hardness and microstructure of the cladding layer were analyzed. The results showed that the flow of protective gas had a significant effect on the residual stress. The minimum residual stresses were obtained under the laser power of 1 800 W,the scanning velocity of 10 m/s,the protective gas flow of 400 g/min,the curvature radius of 60 mm and the lap-over ratio of 30% with a circumferential cladding direction. The crystal morphology from the top of the cladding layer to the bonding zone was developed from the plane crystal to the dendrite. Besides, no defects in the cladding layer were observed and a metallurgical bonding between powders and substrate was achieved. In addition, the micro-hardness value experienced a stair-step increase from the substrate to the top of cladding layer. The average micro-hardness was more than 60 HRC, which could meet the hardness requirements of blade edges on die-cutting machines.

Key words: laser cladding, radius of curvature, micro-hardness, residual stress, microstructure

中图分类号: 

  • TG115
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