Estudo do desgaste abrasivo dos revestimentos de FeMnCrSiB aplicados por aspersão térmica chama a pó

Abstract

Sprayed Coatings are used for various purposes, such as wear resistance, corrosive environments and high temperatures. One of the biggest problems faced in industries is related to abrasive wear, which can cause enormous damage to components and equipments, being one of the main factors of capital depreciation and maintenance costs. This research has as motivation to investigate the feasibility of increasing the useful life of parts and systems by the application of coatings. The objective of this work is to make a comparative study of the resistance to abrasive wear of coatings deposited by Powder Flame Spray using an austenitic alloy of FeMnCrSiB type with different boron contentes, with pre- and post-heating of the of the SAE 1020 carbon steel substrate. The microstructural properties formed were analyzed using Optical Microscopy, Scanning Electron Microscopy (SEM) and Analysis by Energy Dispersive Spectroscopy (EDS), as also the abrasion resistance was evaluated according to procedure established by ASTM G-65. The increase of the boron content in coatings was accompanied by higher values of microhardness, effects on the microstructure were evidenced, as also lower performance in relation to the abrasive wear. In a general way, a research showed satisfactory results that allow to reduce the problem of abrasive wear.