The effect of the process parameters on the laser hardening quality – POSTER

Dvořák Libor, Škrétová Anna - VÚTS, a.s. (Czech Republic)

Laser technologies are among the unconventional, but at the same time rapidly evolving methods of machining and heat treatment, which offer a number of advantages. In the field of heat treatment, laser technologies are widely used in surface hardening. Laser hardening is a very fast and effective method. This is a localized heating, so the main benefit of the technology includes only a small heat effect of the surrounding material, which results in lower energy consumption compared to the conventional hardening method. Another benefit is only a minimal need for further surface treatment after hardening. Hardening of the material to the required depth and achieving the required surface hardness depends on the correct setting of the laser process parameters, which are primarily temperature and feed rate of the laser head. These values of the parameters are different for each type of material. In this article, the optimal process parameters for surface laser hardening of commonly used steels were tested; ČSN 12 050 (1.1191), ČSN 15 142 (1.7225) and ČSN 19 312 (1.2842). The quality of hardening was studied using operating temperatures of 900, 1100, 1200 and 1300 ° C and using specified laser head feed rate of 0.003, 0.005 and 0.007 m/s. The best results of the hardening depth was usually achieved using the combination of parameters; temperature T = 1300 ° C and feed rate f = 0.003 m/s.
Keywords: laser hardening, heat treatment, hardness, steel 1.1191, 1.7225, 1.2842

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