Efeito da carga e do tamanho do grão abrasivo no desgaste do ferro fundido branco 19,9 % cromo e 2,9 % carbono

• Ano de defesa: 2013
• Autor(a) principal: Tozetti, Karla Dubberstein
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Engenharia Mecânica; Centro Tecnológico; UFES; Programa de Pós-Graduação em Engenharia Mecânica
• Palavras-chave em Português: High-chromium white cast iron; Abrasive size; Load; Abrasive wear; Pin on disc; Rubber wheel; Tamanho da partícula abrasiva; Carga; Desgaste abrasivo; Pino sobre lixa; Roda-de-borracha; Ferro fundido; Metalurgia; Usinagem por eletroerosão; Atrito; Engenharia Mecânica; 621
• Link de acesso: http://repositorio.ufes.br/handle/10/4189

In this research, the effects of different applied load and abrasive size on the martensitic high-chromium write cast iron (with a chemical composition: 2,9% carbon and 19,9% chromium) abrasive wear was investigated. The alloy s microstructure consists of: a matrix martensite tempered at 200 ° C with eutectic carbide. Abrasive wear tests using a pin test on silica and garnet paper were carried out using three different abrasives sizes: 63 μm, 149 μm e 177 μm and two applied load: 5 N e 10 N. And the rubber wheel abrasion test (ASTM standard G-65) was carried out using three abrasives sizes: 87 μm, 115 μm e 170 μm and three distinct applied loads: 44 N, 80 N e 130 N. The specimens wear surface was examined by scanning electron microscopy (SEM) for identifying the wear mechanism. The rubbers wheel abrasion test results show that: the mass loss of the write cast iron alloy increases linearly with the increase of particle size until the critical particle size is reached. In pin test on silica paper, to the largest abrasive size, the lost volume in abrasion tripled with applied load increasing of 5 N to10 N. In general, the mass loss increases with the increase of the load applied and the abrasive size.