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Laser composite surfacing of A681 steel with WC+Cr+Co for improved wear resistance

2016; Elsevier BV; Volume: 6; Issue: 1 Linguagem: Inglês

10.1016/j.jmrt.2016.04.002

2214-0697

Moisés F. Teixeira, Victor Alexandre Veit Schmachtenberg, Gustavo Tontini, Guilherme Dalla Lana Semione, Walter Lindolfo Weingaertner, V. Drago,

Laser Material Processing Techniques

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 ∼560 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.