Experimental Study on the Effect of Energy Density on Microstructure Evolution and Properties of CrFeCoNiNb Cladding Layer

doi:10.3901/JME.2023.02.127

Abstract

Abstract: CrFeCoNiNb high entropy alloy laser cladding layer was prepared on the surface of 42CrMo substrate by powder preseting method, and the effect of laser energy density on the microstructure and properties of CrFeCoNiNb cladding layer was investigated.For the preset powder type, the influence of laser power on the quality of cladding layer is the largest and most intuitive among the three factors of process parameters. For the type of powder preseting method, laser power, scanning speed and spot diameter are three factors of process parameters, which do not independently affect the quality and performance of the cladding layer, and laser power has the greatest influence on the quality and performance of the cladding layer. By changing the laser power and then changing the laser energy density acting on the cladding layer, the influence of the laser energy density on the hardness, wear resistance and corrosion resistance of the high entropy CrFeCoNiNb alloy cladding layer was studied. The experimental results show that with the increase of energy density, the main phase content of the body-centered cubic(BCC) decreases at first and then increases, and the grain of the cladding layer is refined at first and then coarsely. The energy density at the turning point is 116.7 J/mm². Moreover, at the point, the phase distribution of the cladding layer is more uniform, and the wear morphology is mainly smooth furrow. The corresponding friction reduction effect is good, and the wear rate is reduced to a certain extent. The change of the content of main phase and the change of grain size correspond to the main factors which affect the average microhardness and corrosion resistance of cladding layer respectively. The increase of BCC phase is beneficial to the improvement of the hardness of the cladding layer, and the refined grain can form a dense passivation film, which is beneficial to the improvement of the corrosion resistance of the cladding layer.

Key words: energy density, high entropy alloys, microstructure, mechanical properties, corrosion resistant

CLC Number:

TG133

SONG Pengfang, JIANG Fulin, WANG Yuling, YANG Fazhan, WANG Ran. Experimental Study on the Effect of Energy Density on Microstructure Evolution and Properties of CrFeCoNiNb Cladding Layer[J]. Journal of Mechanical Engineering, 2023, 59(2): 127-137.

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