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| The effect of pre-placed thickness of powder on the forming quality and properties of Mo2FeB2 coating |
| YANG Jianghuai 1，2，LIAN Guofu 1，2，ZHANG hao3，CAO qiang 1，2，QUE linzhi 1，2 |
| （ 1. Fujian Key Laboratory of Intelligent Machining Technology and Equipment，Fujian University of Technology，
Fuzhou 350118, China; 2. School of Mechanical and Automotive Engineering, Fujian University of Technology,
Fuzhou 350118, China; 3. School of Materials and Metallurgy, Wuhan University of Science and Technology, Wu‐
han 430081, China） |
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Abstract In order to explore the influence mechanism of powder thickness on the forming quality and perfor‐
mance of Mo
2FeB2 coating, the Mo2FeB2 coatings were prepared by the laser cladding preset powder method. The
influence of powder coating thickness on the morpgology, microstructure, microhardness, and wear resistance of
Mo
2FeB2 coatings were studied. It is found that the height and width of the coating increases and the dilution rate
decreases gradually when the thickness of the powder is increased. The thickness of the powder do not affect the
phase composition of the coating, but the main phase composition present in the coating helps to improve the hard‐
ness, wear resistance and other properties of the coating. The microstructure of the coating is observed that the
number of dendrites shows a trend of first increasing and then decreasing with the increase of the powder thick‐
ness, and the size of the dendrites first remains the same and then decreases, and the gap of dendrites is smaller
than the other two thicknesses when the powder thickness is 1.0 mm. The metallographic spotting test and element mapping results show significant elemental segregation in the coating. Microhardness test shows that the increase
in the thickness of the spreading powder is beneficial to improve the average hardness of the coating. Wear test
show that the increase in the thickness of the spreading powder is beneficial to improve the wear resistance of the
coating. It is found that 1.0 mm is the best powder thickness selection by analyzing the macroscopic morphology,
microstructure, hardness and wear resistance of different powder laying thicknesses and integrating the actual de‐
mand and economic benefits.
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Received: 27 October 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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2024, Vol. 34 
