Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/doi/10.4322/2176-1523.20181581
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

AVALIAÇÃO DO COMPORTAMENTO MECÂNICO DO AÇO INOXIDÁVEL AUSTENÍTICO 304L VIA NANOINDENTAÇÃO

MECHANICAL BEHAVIOR EVALUATION OF 304L AUSTENITIC STAINLESS STEEL VIA NANOINDENTATION

Carolline Serafim da Silva, Camila Oliveira de Souza, Andrey de Moraes Barcelos Casanova, Rodolfo da Silva Teixeira, Juciane Maria Alves, Andersan dos Santos Paula, Luiz Paulo Mendonça Brandão

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Resumo

Avaliou-se o comportamento mecânico do aço inoxidável austenítico 304L submetido à transformação martensítica induzida por deformação plástica com percentuais distintos durante a laminação a frio à temperatura ambiente e após tratamento térmico de recozimento, para reversão da martensita em austenita, em duas condições: 800 °C e 750 °C por 1 min. As propriedades mecânicas foram mensuradas via nanoindentação instrumentada com cargas máximas de ensaio de 1 e 20 gf e a evolução microestrutural, quanto a presença de martensita α’, foi avaliada ao longo das etapas de processamento pela técnica de ferritoscopia. Observou-se incremento das propriedades mecânicas após processo de laminação a frio quando comparadas à condição como recebida e tendência de estabilização quando comparadas entre si. Amostras do aço 304L tratadas à 800 ºC por 1 min obtiveram incrementos mais significativos nas propriedades mecânicas devido a alterações microestruturais mais acentuadas.

Palavras-chave

Aço inoxidável austenítico; Efeito TRIP; Martensita; Nanoindentação.

Abstract

The mechanical behavior of 304L austenitic stainless steel 304L was evaluate after transformation induced plasticity during cold rolling at room temperature up distinct thickness reduction and after annealing heat treatment, for reversion of the martensite in austenite, in two conditions: 800 °C and 750 °C during 1 min. The mechanical properties were measured via instrumented nanoindentation with distinct maximum loads (1 and 20 gf) and the microstructural evolution was evaluated along the processing stages by ferritoscopy. It was observed an increase of the mechanical properties after the cold rolling process when compared to the condition as received and the tendency of stabilization when compared to each other. Samples of 304L steel treated at 800 °C for 1 min showed more significant increases in mechanical properties due to more pronounced microstructural changes.

Keywords

Austenitic stainless steel; TRIP effect; Martensite; Nanoindentation.

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