Influence of the type of electrode on the microstructure and coefficient of friction obtained by sliding test to hard coatings deposited by welding smaw

Abstract

In the field of hard coatings it is common to find applications that are subject to wear processes, for this reason, it is important to analyze how the type of electrode applied in a process of arc welding with a coated electrode (Shielded Metal Arc Weldind, SMAW) affects the microstructure and the coefficient of friction obtained in sliding wear tests. To carry out this work, three (3) different types of high chromium (23.5 - 35Cr%) and high carbon (3.4 - 5C%) coatings were applied on AISI steel substrates SAE 1020 and on them were made spherical wear tests on the disc (sphere on disk), the corresponding friction coefficient values ??were obtained and the theory of plasticity proposed by several authors was corroborated [1], and the microstructure obtained from each one of them was analyzed. the coatings and the roughness values ??of the surface tested by means of confocal microscopy and 3D interfometry respectively; In this work it was found that for sliding wear conditions, the best performance was obtained with the coating with medium chromium content (31%).