Title

CARACTERIZAÇÃO MICROESTRUTURAL DE UM AÇO MICROLIGADO AO NIÓBIO PROCESSADO VIA ARB E POSTERIORMENTE RECOZIDO A 600oC

MICROSTRUCTURAL CHARACTERIZATION OF A NIOBIUM MICROALLOYED STEEL DEFORMED VIA ARB PROCESS AND ANNEALED AT 600oC

Authorship

Filho, Márcio Cesar da Silva; Lins, Jefferson Fabrício Cardoso; Rios, Paulo Rangel; Bott, Ivani de Souza; Baldan, Carlos Alberto

Filho, Márcio Cesar da Silva

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Lins, Jefferson Fabrício Cardoso

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Rios, Paulo Rangel

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Bott, Ivani de Souza

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Baldan, Carlos Alberto

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DOI

10.5151/2594-5327-0328

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Abstract

Este trabalho teve por objetivo reportar a evolução da microestrutura de um aço microligado estabilizado ao nióbio processado via ARB e posteriormente recozido. O processo foi conduzido num único ciclo de deformação a 500 °C. A etapa de recozimento foi realizada a 600 oC entre 5 e 60 min. A caracterização microestrutural das amostras utilizou as técnicas de MO, MEV e dureza Vickers. O material deformado apresentou uma microestrutura bastante refinada devido à presença de ferrita acicular e bainita.

This work reports the microstructure evolution of a niobium microalloyed steel deformed via accumulative roll-bonding (ARB) process and annealed. Annealing was carried out at 600 °C between 5 to 60 min. The microstructural characterization of the specimens was performed using light optical microscopy (LOM), scanning electron microscopy (SEM), and Vickers hardness test. The presence of acicular ferrite and bainite was the responsible by severe grain refinement observed in the as- deformed microstructure.

Keywords

Niobium microalloyed steel; ARB; Recrystallization; Several plastic deformation.

Niobium microalloyed steel; ARB; Recrystallization; Several plastic deformation.