JSEMAT> Vol.4 No.4, July 2014

Modification of Steel Surface Using the Laser Energy Olga Chudina

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Olga Chudina

ABSTRACT

The article is devoted to surface hardening of steels by alloying with the use of laser energy. Two combined technologies were proposed: first—laser alloying by nitride-forming elements followed by nitriding, and secondthe local laser alloying followed by metallization in atmosphere of ammonia. It is shown that laser alloying in continuous radiation forms a layer with a 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 a 3 - 15 times and crack resistance in a 1.5 times. Two-stage technology of metallization allows getting diffusion layer on the surface of steels with the thickness, which is 1.5 - 2 times higher than after traditional metallization. In addition, this method of surface modification can significantly reduce the temperature of diffusion metallization and reduce the processing time to 3 hours. The optimal regimes of both technologies, which provide homogeneous multiphase diffusion layers with high hardness and wear resistance, were determined.

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Cite this paper

Chudina, O. (2014) Modification of Steel Surface Using the Laser Energy Olga Chudina. Journal of Surface Engineered Materials and Advanced Technology, 4, 181-188. doi: 10.4236/jsemat.2014.44021.

References

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