| XU Ping,JIANG Guo-ye,HU Yan-jiao,PANG Ming.Influence of Keyhole Effect on the Cross-section Geometry of Laser Cladding Layer[J],48(10):125-130 |
| Influence of Keyhole Effect on the Cross-section Geometry of Laser Cladding Layer |
| Received:April 07, 2019 Revised:October 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.10.015 |
| KeyWord:laser cladding keyhole cross-sectional morphology Gaussian beam distribution nickel-based superalloy crescent-shaped mushroom-shaped |
| Author | Institution |
| XU Ping |
College of Airport Engineering, Civil Aviation University of China, Tianjin , China |
| JIANG Guo-ye |
College of Airport Engineering, Civil Aviation University of China, Tianjin , China |
| HU Yan-jiao |
College of Airport Engineering, Civil Aviation University of China, Tianjin , China |
| PANG Ming |
College of Airport Engineering, Civil Aviation University of China, Tianjin , China |
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| Abstract: |
| The work aims to study the influence of keyhole effect on the cross-section morphology of cladding layer and to reveal the mechanism of keyhole on substrate under different process parameters such as laser power, scanning speed and powder feeding rate. The YLS-3000 fiber laser with Gaussian beam distribution was used to coat Ni-based superalloy Ni35. The cross-section macroscopic morphology of the cladding layer was collected by optical microscope (OM), and the cladding cross-section parameters were measured by metallographic analysis software and computer aided drawing software. With the increase of laser power, the keyhole depth increased. As the scanning speed and the powder feeding rate increased, the keyhole depth decreased. With the increase of powder feeding rate or the decrease of laser power, the height (H2 and H4) of the left and right vertical section of the cladding layer cross section decreased. As the scanning speed increased, H2 and H4 firstly increased and then decreased. During laser cladding, when keyhole was not formed on substrate, H2 and H4 were zero and the cross-sectional shape of the mixed layer of the cladding layer and the substrate was crescent-shaped. When keyhole was formed on the substrate, H2 and H4 were more than zero and the cross-sectional shape of the mixed layer of the cladding layer and the substrate was mushroom-shaped. During laser cladding, different process parameters, laser power, scanning speed and powder feeding rate have different effects on keyhole and the cross-section parameters H2 and H4 of the cladding layer are significantly affected by the strength of the keyhole effect, thus changing the morphology of the cladding layers. |
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