Contribuição aos estudos dos Mecanismos de Interação das Partículas Abrasivas com as Microestruturas de Ferros Fundidos em Processo de Desgaste

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The evaluation of wear (loss of mass during time) of some mechanical components used in circuits of iron ore slurry pumping represents an economical relevant problem in mining industry. Cast irons with high chromium content is the most frequently material having desired properties for this application. The aim of this study is to contribute to the understanding of abrasion wear mechanisms in high chromium content cast irons. The main mechanism of wear is the erosive and abrasive action of silica and ore iron particles present in the slurry being pumping. Abrasion ball laboratory test was adapted in order to simulate similar conditions as those present in industry and then correlate microstructural features and material behavior under abrasion. As received alloys were compared with oil quenched samples of the same alloys so that changes in carbides content, morphology and distribution could be taking into account during loss of mass analyses and abrasive particles to matrix and carbides interaction. Scanning electron microscopy (SEM), as well as image analyses allow us to observe a great variety of features involving wear mechanisms is this microstructures and better understand the role of abrasive particles in the wear phenomena.

ASSUNTO(S)

ferro fundido aço-estruturas ciência dos materiais engenharia de materiais e metalurgica aço-fundição

ACESSO AO ARTIGO

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