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| Study on the influence of powder size and process parameters on the microstructure and properties of NbC cladding layer |
| YUE Kun 1，2，LIAN Guofu 1，2，HUANG Xu 1，2，FENG Meiyan 1，2，LAN Ruqing 1，2 |
| （1.School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou 350118, China；
2.Key Laboratory of Intelligent Machining Technology and Equipment，Fujian University of Technology, Fuzhou
350118, China） |
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Abstract In this study, Nb and B4C particles with different particle sizes were prepared on 45 steel surface to
synthesize NBC in situ. The effect of different particle size and process parameters on the microstructure evolution
and microhardness of the composite coating was studied. The central composite design module of response
surface method was used to analyze the influence of powder particle size, laser power, scanning speed and gas
flow rate on the performance of composite cladding layer, and the mathematical model between process parameters
and cladding layer hardness was established. The accuracy of the model was verified by variance analysis
and model test. It is found that the phase composition of the cladding layer is not changed by changing the particle
size of the powder, but the hardness of the cladding layer increases with the increase of the laser power and
the particle size of the powder, and decreases with the increase of the scanning speed and the gas flow rate. The
error rate between the predicted value and the actual value is 1.4 %. The research results provide a theoretical basis
for the prediction and control of cladding layer performance.
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Received: 30 August 2022
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Corresponding Authors:
练国富（1980—），男，博士，教授，主要研究方向为激光增材制造。
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2023, Vol. 33 
