Evaluación ultrasónica de las fases formadas de un acero inoxidable dúplex 2205 tratado térmicamente a 750 °C y su comportamiento frente a la corrosión

Autores/as

DOI:

https://doi.org/10.3989/revmetalm.135

Palabras clave:

Acero inoxidable dúplex 2205, Corrosión, Evaluación ultrasónica, Fase Chi, Fase Sigma, Tratamiento térmico

Resumen


El presente estudio evalúa el comportamiento de las variables ultrasónicas en probetas de acero inoxidable dúplex 2205 (UNS31803/ EN1.4462), tratadas térmicamente a 750 °C durante distintos tiempos, con el objetivo de promover la precipitación de fases secundarias, chi (χ) y sigma (σ). Se estudió la evolución microestructural mediante microscopía óptica y electrónica de barrido, y utilizando la técnica ultrasónica pulso eco de contacto. Finalmente, se realizaron ensayos electroquímicos con el objetivo de evaluar la resistencia a la corrosión. Los resultados revelaron que a medida que aumenta el tiempo de tratamiento térmico se produce un incremento de las cantidades relativas de fases χ y σ a lo largo de las interfases ferrita/ferrita y ferrita/austenita, especialmente hacia el interior del grano ferrítico. La velocidad de onda longitudinal y el coeficiente de atenuación presentaron una tendencia que coincide con los cambios microestructurales generados por efecto del tratamiento térmico. La evaluación electroquímica reveló una alta resistencia a la corrosión uniforme. No obstante, se observó una correlación entre el aumento del tiempo de tratamiento térmico con la pérdida de la resistencia a la corrosión localizada.

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Citas

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Publicado

2019-03-30

Cómo citar

Trocoli-Montesino, P., Rodríguez-Prato, E., Rosales-Mendoza, A., & González-Hermosilla, W. (2019). Evaluación ultrasónica de las fases formadas de un acero inoxidable dúplex 2205 tratado térmicamente a 750 °C y su comportamiento frente a la corrosión. Revista De Metalurgia, 55(1), e135. https://doi.org/10.3989/revmetalm.135

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