Propriedades mecânicas e características microestruturais de um aço de alta resistência submetido a diferentes processos de têmpera

• Ano de defesa: 2017
• Autor(a) principal: Leandro Scheffer Cipriani
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Engenharia metalúrgica materiais e de minas; Engenharia metalúrgica; Metalurgia física; Metais Têmpera; Microestrutura; Aço de alta resistência Propriedades mecânicas
• Link de acesso: http://hdl.handle.net/1843/BUOS-AVQN6J

The effect of different quenching processes, conventional and direct, on the microstructure, mechanical properties and toughness of a high strength steel were investigated in this dissertation. Regardless of the process used, the martensitic microstructure is not obtained. It was composed of bainite and ferrite, with a higher ferrite fraction observed in the steel subjected to conventional quenching. Due to this difference, the yield strength and tensile strength values of steel subjected to direct quenching were higher when comparated to steel processed by conventional quenching. On the other hand, the steel subjected to conventional quenching exhibited higher toughness, measured by Charpy tests