Journal of Materials Research and Technology Journal of Materials Research and Technology
J Mater Res Technol 2017;6:33-9 DOI: 10.1016/j.jmrt.2016.04.002
Original Article
Laser composite surfacing of A681 steel with WC+Cr+Co for improved wear resistance
Moisés Felipe Teixeiraa, Victor Alexandre Veit Schmachtenbergb, Gustavo Tontinia, Guilherme Dalla Lana Semioneb, Walter Lindolfo Weingaertnerc, Valderes Dragoa,b,,
a Centro Tecnológico (CTC), Programa de Pós-graduação em Ciência e Engenharia de Materiais (PGMAT), Departamento de Engenharia Mecânica, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
b Centro de Ciências Físicas e Matemáticas (CFM), Programa de Pós-graduação em Física (PGFSC), Departamento de Física, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
c Centro Tecnológico (CTC), Programa de Pós-Graduação em Engenharia Mecânica (POSMEC), Departamento de Engenharia Mecânica, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
Received 23 October 2015, Accepted 12 April 2016
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 86wt.% WC+8wt.% Cr+6wt.% Co. It was carried out using a continuous wave λ=1064nm 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.

Keywords
Laser surface alloying, Composite boundary layer, WC, Microstructure, Microhardness, Wear
J Mater Res Technol 2017;6:33-9 DOI: 10.1016/j.jmrt.2016.04.002