Influência da deformação superficial induzida na resistência à fadiga do ferro fundido nodular austemperado

• Ano de defesa: 2010
• Autor(a) principal: Francis Jose Saldanha Franco
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Ferro fundido nodular; Austempera; Rolagem; ADI; Virabrequins; Resistência à fadiga; Engenharia metalúrgica; Engenharia de minas; Ciência dos materiais; Ferro fundido
• Link de acesso: http://hdl.handle.net/1843/BUOS-8GQJD8

The austempered ductile iron (ADI) is stronger, lighter and cheaper than forged carbon steels. In addition, ADI displays a higher ductility, toughness and resistance to wear than other cast irons. This work presents an analysis of the effect of induced superficial deformation on the fatigue resistance of ADI and it was studied the possibility to reduce the time of austempering treatment and the influence of this in the microstructure of samples obtained from a crankshaft. A special device was built for imposing the superficial deformation. The results indicated a fatigue resistance of 439 MPa for the ADI, that was increased by 38% after the superficial deformation, and the results indicated the possibility of reducing the treatment time of the material in 25%..