Сreating of modified hardening layers on the surface of steels by laser and chemical heat treatment
Abstract
The article is devoted to the problem of increasing of operational properties of steel products through the creation of hardened layers on the surface modified by laser and chemical-thermal treatment. The combined technology consisting in laser alloying of steel by nitride-forming elements and nitriding was proposed. It is shown that laser alloying in continuous radiation forms layer with homogeneous fine-grained structure with thickness of 600 microns. The subsequent nitriding increases the microhardness of the surface layer of low- carbon steels to 20,000 MPa, increases wear-resistance in 1,5–3 times, and crack resistance in a 1,5 times. The optimal of technology, which provide homogeneous multiphase diffusion layers with high hardness and wear resistance, were defined.
References
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