High power diode laser remelting of metals

22nd International Laser Physics Workshop

Chmelickova, H.^1 ; Tomastik, J.^1 ; Ctvrtlik, R.^1 ; Supik, J.^2 ; Nemecek, S.^3 ; Misek, M.^3

Joint Laboratory of Optics of Palacky University, Palacky University, Academy of Sciences of the Czech Republic, 17. listopadu 50a, 772 07 Olomouc, Czech Republic^1

Palacky University, Faculty of Sciences, Department of Experimental Physics, 17. listopadu 12, 771 46, Olomouc, Czech Republic^2

MATEX PM, Morseova 5, Plze, 301 00, Czech Republic^3

关键词: High power diode laser;    Identical process;    Laser beam homogenizer;    Laser surface remelting;    Optical microscopes;    Processing parameters;    Rectangular beams;    Uniform intensity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/497/1/012010/pdf
DOI  :  10.1088/1742-6596/497/1/012010

来源: IOP

【 摘 要 】

This article is focused on the laser surface remelting of the steel samples with predefined overlapping of the laser spots. The goal of our experimental work was to evaluate microstructure and hardness both in overlapped zone and single pass ones for three kinds of ferrous metals with different content of carbon, cast iron, non-alloy structural steel and tool steel. High power fibre coupled diode laser Laserline LDF 3600-100 was used with robotic guided processing head equipped by the laser beam homogenizer that creates rectangular beam shape with uniform intensity distribution. Each sample was treated with identical process parameters - laser power, beam diameter, focus position, speed of motion and 40% spot overlap. Dimensions and structures of the remelted zone, zone of the partial melting, heat affected zone and base material were detected and measured by means of laser scanning and optical microscopes. Hardness progress in the vertical axis of the overlapped zone from remelted surface layer to base material was measured and compared with the hardness of the single spots. The most hardness growth was found for cast iron, the least for structural steel. Experiment results will be used to processing parameters optimization for each tested material separately.