Evaluation of the Microcrack Generation of ABNT M2 High Speed Steel in EDM Process With Addition of Silicon Carbide Powder - DOI: 10.4025/actascitechnol.v30i2.543

• Autor(a) principal: Pereira Rodrigues, Jean Robert
• Data de Publicação: 2008
• Outros Autores: Cruz, Claudionor, Domingues Franco, Sinésio, Pereira Rodrigues, José Roberto, Assunção, Wellinton de
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Acta scientiarum. Technology (Online)
• Texto Completo: http://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/543
• topic: electrical discharge machining; dielectric fluids; powder of SiC; craters; microcrack formation; Usinagem por Descargas Elétricas; Fluido Dielétrico; Pó de SiC; Crateras; Geração de Microtrincas.; Engenharia Mecânica

It is known that Electrical Discharge Machining (EDM), it is a thermal process where it can be had very high temperatures (higter than 1200° C) in the region of machining consequently is easy to understand that during each electric discharge, hight temperatures are generated, causing local fusion or even evaporation of the material machined. In each discharge, a crater is formed in the material and a small crater is formed in the electrode. Of every melted material produced in each discharge, only 15%, or minus, it is removed through the dielectric liquid. The remaining of the melted material solidifies forming a wrinkled surface. The characteristics of the surface obtained, overlap of craters, globules of sullage, “chimneys ", bubbles (formed when the gases arrested are liberated through the material resolidificado), they are revealed through an analysis by scanning electron microscope. O proposed work, has for objective to study the effect of the addition of powder of SiC in several dielectric fluids, on microcrack generation, in workpiece of the high speed steel (ABNT M2), during the electrical discharge machining. The presented results show that the samples machined with the addition of powders of SiC presented significant reduction of the number of microcrack in the surface machined, when compared with the machined with conventional EDM.