The effect of pre-placed thickness of powder on the forming quality and properties of Mo2FeB2 coating
In order to explore the influence mechanism of powder thickness on the forming quality and perfor-mance of Mo2FeB2 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 Mo2FeB2 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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