Effect of Laser Surface Hardening on Different Surface Designs in the Case of 1.2379 Tool Steel

Mészáros, Béla and Fábián, Enikő Réka (2025) Effect of Laser Surface Hardening on Different Surface Designs in the Case of 1.2379 Tool Steel. ACTA MATERIALIA TRANSYLVANICA (EN), 8 (1). pp. 28-33. ISSN 2601-8799

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Abstract

Laser surface treatments are increasingly used for the formation of hardened layers. In this experimental series, we examined surfaces machined to three different depths (0.25 mm, 0.5 mm, and 0.75 mm) to determine how these machining depths affect the thickness of the hardened layer. The base material was 1.2379 tool steel in all cases. The focal distance remained constant, while the laser power and scanning speed were varied according to the predefined experimental design. Our results indicate that higher specific power led to a deeper hardened layer. The 45° machining angle—and consequently, the 45° laser beam incidence angle—enhanced absorption and increased the hardening depth. The deepest grooves resulted in the thickest hardened layer. However, during our experiments, certain parameter settings raised the base material’s temperature above the liquidus point, causing localized melting.

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