Influência da temperatura de solubilização nas propriedades mecânicas do aço Maraging 300

Detalhes bibliográficos
Ano de defesa: 2018
Autor(a) principal: Lima Filho, Venceslau Xavier de
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Não Informado pela instituição
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://www.repositorio.ufc.br/handle/riufc/47921
Resumo: The understanding of the relationship between mechanical properties and microstructure of ultra high strength steels remains a key problem in metallurgy with important consequences for the industry, notably those of high performance such as nuclear, petrochemical and aerospace. Maraging steels are a class of ultra high strength steels of special importance due to their performance. In this work, the effects of the solution treatment temperature on the mechanical properties of the maraging 300 steels were evaluated, in order to maximize their toughness without considerable detriment of their mechanical strength. Five solution treatment temperatures were evaluated over a one hour treatment time. The characterization of the mechanical properties was done by tests of Rockwell C hardness, Charpy-V impact toughness, NTS impact sensitivity, tensile and fracture toughness in plane strain. The microstructural characterization was performed by optical microscopy to determine the prior austenite grain size and microstructure analysis, scanning electron microscopy for analysis of the microstructure and fracture surfaces, X-ray diffraction and backscattered electron diffraction. The results obtained demonstrated a Hall-Petch type relationship between the solution treatment temperature and the mechanical tensile strength. Conversely, an increase in fracture toughness was observed with increasing solution treatment temperature. In this way it was possible to find a heat treatment condition in which it was possible to raise about 20% of the toughness with a loss of only 6% in the tensile strength.