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Contemporary Materials I−1 (2010)

Contemporary Materials, I−1 (2010)     Page 19 - 30

UDK 541.182:535.3

SURFACE TREATMENTS BY LASER TECHNOLOGY

M. A. Montealegre, G. Castro, P. Rey, J. L. Arias, P. Vázquez, M.González

AIMEN Technology Centre, Relva 27 A, Torneiros, 36410 Porriño, Pontevedra, Spain

Abstract

In­du­strial ap­pli­ca­ti­ons re­qu­i­re parts of com­po­nents with spe­ci­fic sur­fa­ce proper­ti­es such are good cor­ro­sion re­si­stan­ce, we­ar re­si­stan­ce and hard­ness. Al­loys with tho­se pro­per­ti­es are usu­ally very ex­pen­si­ve and the­re is a gre­at in­te­rest in re­du­cing the cost of com­po­nents for ful­fil­ling the­se requ­i­re­ments. In this sen­se, la­ser sur­fa­ce processing has been used as a cost-ef­fec­ti­ve tec­hni­que to im­pro­ve the sur­fa­ce pro­per­ti­es of ma­te­ri­als, by use of the la­ser be­am he­at for mo­di­fi­ca­tion of its struc­tu­re and physi­cal cha­rac­te­ri­stics. La­ser sur­fa­ce tre­at­ments can be di­vi­ded in­to di­rect proces­ses, which only need the ge­ne­ra­ted he­at, such are har­de­ning and mel­ting, and pro­ces­ses which need fil­ler ma­te­rial as al­loying and clad­ding. The­re­fo­re, the aim of this pa­per is to summari­ze the results of se­ve­ral works ba­sed on la­ser sur­fa­ce tre­at­ments, in par­ti­cu­lar, hardening and mel­ting of hot and cold work ste­els, and la­ser clad­ding of for­ming to­ols with nanoparticles. The mic­ro­struc­tu­ral cha­rac­te­ri­za­tion and mec­ha­ni­cal pro­per­ti­es (microhard­ness, we­ar re­si­stan­ce) will be de­scri­bed in each ca­se.

Keywords: La­ser, clad­ding, har­de­ning, na­no­par­tic­les, Nd:YAG la­ser, di­o­de la­ser.

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