Influência do tratamento superficial 3IP na vida em fadiga dos aços ABNT 4340 e 15-5PH para aplicação aeronáutica

• Ano de defesa: 2015
• Autor(a) principal: Bonora, Rafael Gustavo [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Fadiga; Desgaste mecânico; Aço - Corrosão; Aço - Fadiga; Resistencia de materiais; Implantação iônica; Plasma (Gases ionizados); Fatigue
• Link de acesso: http://hdl.handle.net/11449/126392; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/05-08-2015/000839292.pdf

When study materials to use in aircraft structural components must be considered that they are subjected to cyclic loads, being an important parameter for the study of fatigue life of materials. Considering, for example, a landing gear into operation, the study of wear and corrosion is critical, especially when you intend to use new surface treatments techniques. Currently, high strength materials, especially AISI 4340 steel, are widely used as landing gear components. Due to the high resistance to wear and corrosion requirements, components are usually coated with hard chromium or cadmium. Treatments can produce wastes such as cyanide and Cr+6, for example, generated after the application hard chromium and cadmium coatings, which are harmful to health and environment. This project was originated from the national aircraft industry, ELEB/EMBRAER, requirements to reduce the use of electroplated coated materials, mainly electroplated cadmium. The project focus is to study an alternative technique to coatings by electroplating, plasma immersion ion implantation (PI3) applied on the landing gear actuators. Considering the load sustained by the wheel axis of the landing gear, AISI 4340 steel and 15-5 PH stainless steel were tested in axial fatigue, corrosion and wear pin-disc. Also tests were performed, microindentation, nanoindentation, optical microscopy for microstructural analysis, scanning electron microscopy for fractographic analysis, atomic force microscopy and residual stress analysis