Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/article/doi/10.4322/2176-1523.0906
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

EVOLUÇÃO MICROESTRUTURAL, TEXTURA E COMPORTAMENTO MECÂNICO DO AÇO TRIP/TWIP 17MN-0,06C APÓS LAMINAÇÃO A QUENTE, A FRIO E RECOZIMENTO

MICROSTRUCTURAL EVOLUTION, TEXTURE AND MECHANICAL BEHAVIOR OF TRIP STEEL 17MN TWIP-0.06C AFTER HOT ROLLING, ANNEALING AND COLD

Dafé, Sara Silva Ferreira de; Ferreira, Alessandra Cunha; Aguiar, Isabela Viegas; Santos, Dagoberto Brandão; Escobar, Diana María Pérez

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Resumo

Os aços com um alto teor de Mn (15-30%) e os elementos de liga, Si e Al, apresentam plasticidade excepcional devido à geração de maclas de deformação (efeito TWIP) ou múltiplas transformações martensíticas (efeito TRIP). Este trabalho avaliou a evolução microestrutural, a formação da textura e sua influência sobre o comportamento mecânico de um aço contendo 17%Mn-0,06%C laminado a frio com reduções de 45% e 90% e recozimentos a 700 °C durante tempos diferentes. A microestrutura foi analisada por microscopia óptica e eletrônica de varredura, EBSD e difração de raios X. A redução a frio favorece a formação da martensita α’. Nos aços recozidos estão presentes as fases martensita α’, ε e austenita. O limite de escoamento e de resistência à tração alcançaram 750 e 950 MPa, respectivamente, com o alongamento total de 45%, confirmando sua alta capacidade de encruamento. A reversão da martensita para austenita ocorre simultaneamente com a recristalização desta

Palavras-chave

Aço alto manganês, Aço TRIP, Aço TWIP, Martensita.

Abstract

Steels containing high contents of Mn, Si and Al have great plasticity when deformed due to TWIP or TRIP effects. This work evaluated the microstructural evolution, texture formation and its influence on the mechanical behavior of a steel containing 17%Mn and 0.06%C after cold rolling to 45% and 90% of reduction, and annealing at 700 °C for different times. The microstructures were analyzed by optical and scanning electron microscopy. Volume fraction of the phases γ, ε and α’ martensites were measured by X-ray diffraction and EBSD technique. It was found that cold reduction increases the α’ martensite volume fraction. The relative phase amounts showed that the sample annealed for the longest time, 1000 s, still presents ε and α’ martensite. The yield and tensile strength for annealing condition reach values close to 750 and 950 MPa, respectively, with total elongation of 45%, confirm the high work hardening rate of the analyzed steel.

Keywords

Manganese steel, TRIP steel, TWIP steel, Martensite.

Referências

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