Revista de Metalurgia, Vol 51, No 1 (2015)

Efecto de los parámetros de procesado en el desarrollo microestructural y en las propiedades mecánicas en aceros Q&P


https://doi.org/10.3989/revmetalm.035

Irene De Diego-Calderón
IMDEA Materials Institute, España

Dorien De Knijf
Department of Materials Science and Engineering, Gent University, Bélgica

Jon M. Molina-Aldareguia
IMDEA Materials Institute, España

Ilchat Sabirov
IMDEA Materials Institute, España

Cecilia Föjer
Arcelor Mittal Global R&D Gent, Bélgica

Roumen Petrov
Department of Materials Science and Engineering, Gent University - Department of Materials Science and Engineering, Delft University of Technology, Países Bajos

Resumen


Con el objetivo de evaluar el efecto de los parámetros de procesado en un acero con una composición nominal de 0,25C–1,5Si–3Mn–0,023Al (% masa), éste ha sido sometido a un tratamiento térmico denominado “Quenching and Partitioning” (Q&P), en el que se han variado la temperatura de “quenching”, la temperatura de “partitioning” y el tiempo de “partitioning”. Como resultado se ha obtenido una microestructura multifásica, la cual ha sido analizada en detalle utilizando difracción de rayos-X (XRD) y de electrones retrodispersados (EBSD). Asimismo, se han medido las propiedades mecánicas de los aceros Q&P mediante ensayos de tracción. La deformación plástica de los aceros Q&P a nivel micrométrico ha sido estudiada mediante ensayos “in situ” en el microscopio electrónico de barrido y la posterior aplicación de la técnica de correlación digital de imágenes. Se ha determinado el efecto de los parámetros de procesado en la microestructura (composición de fases, tamaño y fracción en volumen de los distintos micro constituyentes, textura y contenido en carbono en la austenita retenida). Una vez se han relacionado las propiedades mecánicas, la deformación plástica a nivel micrométrico y la microestructura, se concluye que la partición de la deformación entre fases depende en gran medida de la propia microestructura del acero Q&P, que a su vez puede ser ajustada a través de la manipulación de los parámetros de procesado.

Palabras clave


Aceros; Austenita retenida; Deformación; Propiedades mecánicas; “Quenching and partinioning”; Transformación de fase

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