Investigation of Phenomena Taking Place in LASER Surface Alloying Steels of WC-Co

Abstract:

The laser surface-treatment methods have been quickly developed by appearing of lasers with high power beam and can increase the hardness, of the surface. A very hard, wear-resisting layer can be produced by the dispersing of ceramic grains. The essence of the technology is, that such a material (compound-phase, e.g.: metal-oxide, carbide, nitride, etc.) is added to the surface layer melted by laser, which does not solve or solves only partly in the metal-melt. This work studies the effect of the different technological parameter (such as, power of the laserbeam, motion speed, amount of the ceramic particles etc.) on the different microstructure accrued during the laser surface alloying. The desired microstructure has homogeneous carbide distribution in the matrix. But it is embarrassed by several conditions. The aim of this present work is to find out the reasons for the inhomogeneous ceramic particle distribution inside the matrix and to discover these embarrassing conditions.

• Periodical: Materials Science Forum (Volume 508)
• Pages: 301-306
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.508.301
• Online since: March 2006
• Authors: Enikő Bitay, András Roósz
• Keywords: Alloying Steel of Carbide, Composite, Laser Surface Alloying, Laser Surface Melting, Particle Dispersing, Surface Treatment

References

[1] Bagyinszki, Gy: Lézerek alkalmazásának technológiai és biztonságtechnikai szempontjai, XI. Nemzetközi és IV. GTE-MHtE-DVS Hegesztési Konferencia, Budapest, 2004. 23-26., pp.14-29.

[2] Gasser, E., Kreutz, E.W., Krönert, et. al.: Dispersion of hard particules in light alloys with CO2 laser radiation, ECLAT, Göttingen, DGM Verlag, Germania , 1992, pp.651-653.

[3] Schüßter, A.: Microstructure and Properties of Laser Composite Layers, Editat de B.L. Mordike, 1992, pg. 287-292.

[4] Löschau, W., Juch, K., Reitzenstein, W.: Alloying and dispersion of TiC-base hard particles into tool steel surfaces, ECLAT'92, Göttingen, DGM Verlag, Germany, 1992, pp.281-285.

[5] Shafirstein, G., Bamberger, M., Langohr, M., Maisenhalder, F.: Laser surface alloying of carbon steel and a-Fe with CrB2 particles, Surface and Coatings Tecxhnology, Nr. 45, 1991, pp.417-423.

DOI: 10.1016/0257-8972(91)90251-q

[6] S. Tosto, M. Bianco: Laser cladding and alloying of a Ni-base superalloy on plain carbon steel, Journal of Materials Science, 29, (1994), pp.504-509.

DOI: 10.1007/bf01162514

[7] Parsons, G.H., Man, H.C.: Laser Surface Engineering, Surface Engineering and Heat Treatment, Cambridge, Anglia, Laser und Optoelektronik 3/1985, Springer Verlag, pp.330-343.

[8] Gnanamuthu, D.S.: Laser Surface Treatments, Applications of lasers in materials processing, Proc. Conf. Washington DC, 1979, Metals Park OH, American Society of Metals, pp.177-211.

[9] Mordike, B. L.: Metallurgical Aspects of Laser Surface Treatment, Conf. Proc. Laser'85 Optoelektronik, Editat de W. Waidelich, Springer Verlag, 1985, pp.171-180.

[10] Bloyce, A.: Energy beam surface melting and alloying of tool steel, PECO-HITEST Network III. Seminar, Proceedings ed. and publ. by AGH, Krakow, 1994, pp.110-126.

[11] H. Fukunaga: ASM Proceedings on Cast Reinforced Metal Composites, Ed. S.G. Fishman a.A.K. Dhingra, Metals Park, Ohio, 1988, p.101.

[12] Bitay, E.: Tratament superficial cu laser al oŃelurilor cu conŃinut redus de carbon, Doktori Tézis, Universitatea Technică Cluj-Napoca, 2002, p.111. fig. 7. 22.