Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7899454 | Journal of Materials Research and Technology | 2017 | 7 Pages |
Abstract
Laser surface alloying (LSA) is a surface treatment technique. It involves the near surface melting by a powerful laser beam with a pre-deposited or concomitantly added alloying element along with a part of the underlying substrate to form a surface alloyed zone. In this paper, it is reported the treatment by laser surface alloying of a cold work steel ASTM A681 substrate simultaneously fed with a powder mixture of 86 wt.% WC + 8 wt.% Cr + 6 wt.% Co. It was carried out using a continuous wave λ = 1064 nm fiber-coupled diode laser with five different laser intensities - resulting in five specimens - and then studied and analyzed their microstructure, phases, composition and microhardness. One of these configurations was applied to enhance a deep drawing tool for automotive steel sheet stamping. The process modified the specimens near surface layer, from a ferritic structure into an austenitic matrix with a refined dendritic microstructure, with an enhanced surface hardness from 250 HV to â¼560 HV. The treated deep drawing tool showed remarkable wear improvement compared to a non-treated one after one thousand stamps. This result allows the process for industrial applications.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Moisés Felipe Teixeira, Victor Alexandre Veit Schmachtenberg, Gustavo Tontini, Guilherme Dalla Lana Semione, Walter Lindolfo Weingaertner, Valderes Drago,