JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2018, Vol. 48 ›› Issue (1): 57-64.doi: 10.6040/j.issn.1672-3961.0.2017.504

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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

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

CLC Number: 

  • TG115
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