Efeito da temperatura de austenitização intercrítica sobre a cinética de transformação martensítica e evolução microestrutural de um aço API-OCTG grau K55
Effect of intercritical austenitizing temperature on the kinetics of martensitic transformation and microstructural evolution in a API-OCTG grade K55 steel
Arthur Cançado Schuttenberg, Verônica Stela da Silva Lima, José Márcio da Rocha, Geraldo Lúcio de Faria
Resumo
Aços API-5CT grau K55 são especificados para tubos de revestimento de poços de exploração de óleo e gás. Eles podem ser fabricados por laminação sem costura, seguida de têmpera e revenimento (processo clássico). No entanto, diversos segmentos industriais têm apontado a utilização de microestruturas bifásicas (ferrita-martensita) como uma alternativa para melhorar a relação resistência mecânica-tenacidade de diversos produtos. Considerando a possibilidade de obtenção de um tubo bifásico por meio da aplicação de têmpera após austenitização intercrítica, este estudo pioneiro investigou o efeito da temperatura de austenitização intercrítica sobre as frações de fases e a cinética de transformação martensítica de um aço API-5CT grau K55. Concluiu-se que, para este aço, a faixa de temperatura de austenitização intercrítica está compreendida entre 750 °C e 820 °C. Verificou-se um aumento significativo nas temperaturas M s e M f , assim como da fração de martensita com a elevação da temperatura de austenitização. Em relação à cinética de transformação martensítica, concluiu-se que o efeito autocatalítico no início da transformação é mais atuante quanto maior a temperatura de austenitização. Modelos de previsibilidade que descrevem a evolução das temperaturas M s e M f , assim como da cinética de transformação martensítica, em função da condição de austenitização, foram aplicados com sucesso.
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References
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Submitted date:
04/02/2022
Accepted date:
02/06/2023
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