Estudo da recristalização dinâmica do aço inoxidável austenítico F 138, utilizado em próteses ortopédicas
AUTOR(ES)
Fabio Henrique Casarini Geronimo
DATA DE PUBLICAÇÃO
2009
RESUMO
In order to analyze the microstructure and to know the dynamic softening mechanics that take place during the hot work in F 138 stainless steel, physical simulation was carried out through continuous isothermal hot torsion tests in a wide range of temperatures and strain rates, covering the real conditions of processing used in the manufacture of orthopedic implants with this material. The plastic flow stress curves obtained in this study showed a typical behavior of dynamic recrystallization. Also was determined the peak and steady-state stresses (σp, σss) and strains (εp, εss) and also the value of apparent activation energy for F 138 stainless steel, which is Q = 475kJ/mol. Through the curves of work-hardening rate vs. equivalent stress (θ vs. σ), the values of critical stress (σc) and strain (εc) for initiation of dynamic recrystallization are obtained. The metallographic observation was used to measure the average grain size under all deformation conditions, and also for the pre-deformed grain, D0 = 85.1μm. Thus it was possible to obtain empirical mathematical equations for the studied steel, which relate the processing parameters with the average grain size, since the resulting grain varies with processing conditions. The obtained data in this study will form a database which could be used in softwares of thermomechanical processing numerical simulation, which will permit the previous evaluation of resulting microstructure in a hot work processing of this material.
ASSUNTO(S)
engenharia de materiais e metalurgica ensaio de torção aço inoxidável austenitico recristalização (metalurgia)
ACESSO AO ARTIGO
http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=3617Documentos Relacionados
- Estrutura e propriedades do aço inoxidável austenítico AISI 316L Grau ASTM F138 nitretado sob plasma à baixa temperatura
- Análise da resistência à corrosão e ao desgaste do aço inoxidável austenítico ASTM F 138 tratado por laser
- Cementação sob plasma à baixa temperatura do aço inoxidável austenítico AISI 316L e do aço inoxidável duplex AISI F51
- A corrosão do aço inoxidável austenítico 304 em biodiesel
- Comportamento plástico do aço inoxidável austenítico em baixa temperatura