| ZHA Bai-lin,JIA Xu-dong,WANG Jin-jin,SHI Yi-ang,SU Qing-dong,CAO Xiao-tian,XU Ke-jun.Effect of Substrate Surface Roughness on Deposition Behavior of Particles by HVOF[J],50(7):233-242 |
| Effect of Substrate Surface Roughness on Deposition Behavior of Particles by HVOF |
| Received:July 20, 2020 Revised:October 21, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.07.024 |
| KeyWord:high velocity oxy fuel particle deposition 45# carbon steel surface roughness equivalent plastic deformation yield stress particle temperature |
| Author | Institution |
| ZHA Bai-lin |
Rocket Force University of Engineering, Xi'an , China;Project Management Center of PLA Rocket Force Equipment Department, Beijing , China |
| JIA Xu-dong |
Rocket Force University of Engineering, Xi'an , China |
| WANG Jin-jin |
Rocket Force University of Engineering, Xi'an , China |
| SHI Yi-ang |
Rocket Force University of Engineering, Xi'an , China |
| SU Qing-dong |
Rocket Force University of Engineering, Xi'an , China |
| CAO Xiao-tian |
Rocket Force University of Engineering, Xi'an , China |
| XU Ke-jun |
Rocket Force University of Engineering, Xi'an , China |
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| Abstract: |
| The effect of substrate surface roughness on the deposition deformation behavior of WC-12Co particles on 45# carbon steel substrate under HVOF spray is studied. Based on Johnson-Cook plastic material model and Thermal-Isotropy- Phase-Change model, LS-DYNA is used for modeling analysis. The results show that there are obvious differences in the deposition behavior of WC-12Co particles on the 45# carbon steel substrate under different substrate surface roughness, and the differences of peak height and trough depth lead to irregular deformation of particles in different degrees. When the substrate surface roughness Ra =10.26 μm, the final morphology of particles will be different due to different deposition positions, but the impact of particles will cause the wave crest shift and deformation, and the particles will fill in different degrees to compensate for the wave trough. During the deposition process, the yield stress, equivalent plastic deformation and temperature rise of the middle and lower parts of the particles contacting the substrate first are higher than those at the top of the particles where the particles contact the substrate later. When Ra=0 μm, the maximum equivalent plasticity of particles is 2.03, and the maximum temperature is 1562 K. The yield stress in the local region of the particle-substrate interface rapidly decreases to 0, but the deformation degree of the substrate is low. The bonding area of the two is limited, and the particle-substrate bonding strength is weak. When Ra =5.34 μm, the yield stress of the particles is the most stable in the non-ideal plane state, and the equivalent plastic strain and temperature rise amplitude are 1.83 and 1496 K respectively. Therefore, it can be concluded that the yield stress, equivalent plastic strain and temperature change are the best under the ideal surface state, but the particle substrate bonding area is low, which is not conducive to particle deposition. Under the condition of non-ideal surface, increasing Ra to a certain extent can promote the plastic deformation of particles, increase the particle temperature, the bonding area and reduce the yield stress of particles, but the morphology of particles deposition is more diverse and complex than that of ideal surface deposition. In addition, the excessive increase of Ra will cause the peak deformation shift and consume a lot of particle kinetic energy. The particles are mainly used to fill the wave trough. The equivalent plastic deformation degree and temperature rise range decrease, and the yield stress increases, which is not conducive to particle deposition. |
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