| WANG Shu-guang,SHI Tuo,FU Ge-yan,WAN Le.Analysis of Dilution Rate and Single Channel Morphology of High-speed Cladding Cr50Ni Alloy by Laser Inside-beam Powder Feeding Process[J],49(7):311-318 |
| Analysis of Dilution Rate and Single Channel Morphology of High-speed Cladding Cr50Ni Alloy by Laser Inside-beam Powder Feeding Process |
| Received:September 27, 2019 Revised:July 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.07.039 |
| KeyWord:laser high speed cladding laser inside-beam powder feeding dilution rate Cr50Ni surface coating |
| Author | Institution |
| WANG Shu-guang |
Soochow University, Suzhou , China |
| SHI Tuo |
Soochow University, Suzhou , China |
| FU Ge-yan |
Soochow University, Suzhou , China |
| WAN Le |
Soochow University, Suzhou , China |
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| Abstract: |
| The work aims to study the influence factors on the changes of the Cr50Ni alloy single-channel morphology bypositive defocusing high-speed cladding of "laser inside-beam powder feeding" and the dilution rate, to prepare a wear-resistant and corrosion-resistant green non-polluting metal surface coating to replace the traditional plating. The high-speed cladding process test was carried out with the "laser inside-beam powder feeding" coupling technology. A Cr50Ni alloy cladding layer was prepared on a 304 stainless steel substrate. A model of powder shading under the condition of laser inside-beam powder feeding was established, and the relationship between the powder feeding rate and the powder shading rate was obtained, so that the laser energy finally irradiated on the substrate was obtained. The laser energy density was positively correlated with the dilution rate and the effect of different powder feeding rates on the dilution rate of the cladding layer was analyzed. At the same time, the effects of different defocusing amounts on the cladding layer dilution rate and the thickness of a single cladding layer were investigated. The microstructure composition change and hardness change trend of the best cladding layer were analyzed. When the scanning speed was 9 m/min, the defocusing amount was +1~+2 mm, and the laser power was 1.85 kW, the cladding layer with better surface morphology, a thickness of about 121~452 μm, a dilution rate of 75%~12.9%, and a hardness value of 280~320HV could be obtained. When the powder particle diameter was 50 μm, the powder shading rate was 16.6%~33.1% at a powder feeding rate of 16 g/min to 32 g/min. The grain morphology at the bottom of the cladding layer was mainly obvious columnar dendrites, and there were some tiny pores inside the cladding layer due to the inability of the gas entering the molten pool to escape quickly. The new technology of "laser inside-beam powder feeding" defocusing powder coupling is based on Cr50Ni alloy material. Under the laser power of 1.85 kW, the powder feeding rate of 28 g/min, the defocus amount of +2 mm, and the scanning speed of 9 m/min, the ideal single-pass forming effect can be obtained to achieve high-speed cladding. |
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