Influência da temperatura de envelhecimento na dureza do aço inoxidável 17-4 PH produzido por Fused Filament Fabrication (FFF)
Influence of aging temperature on the hardness of 17-4 PH stainless steel produced by fused filament fabrication (FFF)
Vitor Mendes Cavalheiro, Eduardo Luis Schneider, Marcelo Favaro Borges, Afonso Reguly, Jorge Luiz Braz Medeiros, Luciano Volcanoglo Biehl, Wagner Caramez, Bruno Oliveira, Julio Cesar Martini
Resumo
A liga 17-4 PH destaca-se pela sua alta resistência mecânica e à corrosão. Com o avanço da FFF, torna-se importante entender a influência dos tratamentos térmicos nessas peças. Este estudo avalia a resposta em dureza do 17-4 PH fabricado por FFF submetido a solubilização (1150 °C/60 min) e envelhecimento a 480 °C e 620 °C por 30, 60 e 90 min, comparando os resultados com valores obtidos por métodos convencionais. A condição de 480 °C/60 min atingiu 36 HRC, enquanto 620 °C apresentou pico de 28 HRC em 30 min, reduzindo-se com tempos maiores. A porosidade remanescente de ~12% nas amostras FFF resultou em diminuição de ~18,2% (480 °C) e ~15,6% (620 °C) em relação às durezas convencionais para 60 min. Os resultados confirmam que o FFF reproduz o comportamento típico de endurecimento por precipitação da liga 17-4 PH, oferecendo uma rota de menor custo e boa flexibilidade geométrica para aplicações em que a dureza máxima não é o principal critério de projeto.
Palavras-chave
Abstract
The 17-4 PH alloy stands out for its high mechanical strength and corrosion resistance. With the advancement of FFF, it becomes important to understand the influence of heat treatments on such parts. This study evaluates the hardness response of 17-4 PH manufactured by FFF after solution treatment (1150 °C/60 min) and aging at 480 °C and 620 °C for 30, 60, and 90 min, comparing the results with values reported for conventional processing. The 480 °C/60 min condition reached 36 HRC, whereas aging at 620 °C showed a peak of 28 HRC at 30 min, decreasing at longer times. The ~12% residual porosity in FFF samples resulted in hardness reductions of ~18.2% (480 °C) and ~15.6% (620 °C) compared to conventional values at 60 min. The results confirm that FFF reproduces the characteristic precipitation-hardening behavior of 17-4 PH, offering a lower-cost and geometrically flexible alternative for applications in which maximum hardness is not the primary design requirement.
Keywords
Referências
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Submetido em:
03/09/2025
Aceito em:
04/12/2025
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