Effect of Defocus Distance on Layer Quality in Insider-Laser Coaxial Powder Feeding Laser Cladding

Abstract

Insider-laser coaxial powder feeding laser cladding is one kind of technique, which can be used in metal part directly manufacturing field. Compared with outsider-laser coaxial powder feeding laser cladding techniques, it has significant advantages [1]. In order to research the effect of defocus distance on the layer quality in insider-laser coaxial powder feeding laser cladding, it has taken some expriments in this paper to study the layer quality by constantly changing the defocus distance, with other laser cladding process parameters invariable. In addition, this paper measues, analysis the cladding layer’s width, height, the surface quality (including surface flatness, flat-wide ratio and flat-high ratio [2]), hardness and microstructure, then summarizes the effect of the defocus distance on the layer quality in this paper.

Review on surface characteristics of components produced by direct metal deposition process

“…We may deduce that changing the particle defocusing distance from -2 to 2 mm results in a hardness range of 600 to 620 HV for Fe 313 [20]. We may determine that altering the material feeding angle between 30 and 60 degrees resulted in a surface hardness of 170 to 180 HV for SS 316L.…”

“…When the defocusing distance is close to the focus point, the microstructure of the cladding layer acts normally, but there is some change in the microstructure during the defocusing stage. To summarise, particle defocusing below the substrate can improve the quality of the surface [18,20]. journal.ump.edu.my/jmes ◄…”

“…As illustrated in Table 1, both travel speed and laser power have a significant effect on the microstructure and hardness of the sample. Sun et al [20] evaluated the layer's quality by altering the defocus distance while maintaining constant the other laser cladding process parameters. Additionally, the study evaluated the cladding layer's breadth, height, surface flatness, flat-wide-to-flat-high ratio, hardness, and microstructure.…”

Wear performance of FeCuMoTiV high entropy alloy coatings by laser cladding

“…High-entropy alloy coatings have the advantages of good corrosion and wear resistance, have a broad engineering application prospect, and have attracted much attention in recent years [13][14][15][16][17][18][19][20]. The methods of preparing high-entropy alloy coatings include laser cladding, plasma cladding, magnetron sputtering, plasma spraying, etc Among them, laser cladding is the most effective means of preparing large-area coatings, which has been widely used in surface modification of materials [21][22][23]. Highentropy alloy coatings prepared by laser melting and cladding usually exhibit good metallurgical bonding and slight dilution with the substrate, which is favorable for engineering applications [24][25][26][27].…”