Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/article/doi/10.4322/2176-1523.0877
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

EFEITO DO TEMPO ENTRE DEFORMAÇÕES NA INTERAÇÃO RECRISTALIZAÇÃO: PRECIPITAÇÃO DE UM AÇO INOXIDÁVEL AUSTENÍTICO COM ALTO TEOR DE NIÓBIO E NITROGÊNIO

[EN] EFFECT OF INTERPASS TIME ON RECRYSTALLIZATION: PRECIPITATION INTERACTION OF HIGH NIOBIUM AND NITROGEN AUSTENITIC STAINLESS STEEL

Silva, Mariana Beatriz dos Reis; Gallego, Juno; Marrero, José Maria Cabrera; Balancin, Oscar; Jorge Júnior, Alberto Moreira

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Resumo

Neste trabalho foi avaliada a influência do tempo entre passes de deformação na interação entre precipitação e recristalização durante o processamento termomecânico do aço ISO 5832-9. A evolução da microestrutura foi investigada por microscopia ótica, eletrônica de transmissão e EBSD. Observou-se que quanto menor o tempo entre passes de deformação, maiores foram as tensões necessárias para promover a deformação e menores os tamanhos dos grãos e precipitados obtidos. Após o encharque, somente precipitados de TiNbN foram encontrados, entretanto NbCrN (fase Ζ) e NbN precipitaram durante o processamento termomecânico. O material sofre recristalização dinâmica e partículas de 50 nm foram efetivas no ancoramento dos contornos de grãos e discordâncias.

Palavras-chave

Aço inoxidável, MET, Interação recristalização-precipitação, Nióbio.

Abstract

In this work it was investigated the influence of interpass time on recrystallization-precipitation interaction during thermomechanical processing of the ISO 5832-9 steel. The microstructure evolution was investigated by optical microscopy, transmission electron microscopy and EBSD. The results show that smaller the interpass time, higher is the stress level and smaller are the grain and precipitate sizes. After soaking, only TiNbN precipitates were found, whereas NbCrN (Ζ-phase) and NbN were formed during thermomechanical processing. The material dynamically recrystallizes and particles of 50 nm were effective in pinning grain boundaries and dislocations.

Keywords

Stainless steel, TEM, Interaction recrystallization-precipitation, Niobium.

Referências

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