GRADED COATING OF A HIGH SPEED STEEL BY LASER SURFACE ALLOYING WITH WC POWDER: A THEORETICAL MODEL AND ITS VERIFICATION

摘要

The results obtained by laser surface alloying M2 high-speed steel with tungsten carbide powder are described. Graded coatings were generated using laser surface alloying in conjunction with powder injection. The structure and hardness of the alloyed layer are largely determined by the degree of alloying. The analysis of the experimental data (dimensions of the laser tracks, tungsten concentration and the process parameters) allowed to develop a mathematical model for the distribution of the temperature and the alloy elements in single and multi-layer coatings. The model- that was developed allows choosing the laser treatment parameters for each layer fabrication in order to obtain a desired composition profile within a graded multi-layer coating.