EVALUATION OF COATED TI-6AL-4V ALLOY WITH WC-CO-CR BY CO2 LASER POWDER BED FUSION (L-PBF)
DOI:
https://doi.org/10.18066/revistaunivap.v32i74.4715Palabras clave:
CO2 laser L-PBF, WC-Co-Cr, aaeronautical titanium alloy, Ti-alloy wear resistance increasingResumen
La aleación Ti-6Al-4V con carburo de wolframio como recubrimiento combina las propiedades únicas de estos dos materiales para crear una superficie de alta resistencia y durabilidad. En este trabajo, la deposición del compuesto de carburo de tungsteno ligado con cobalto (WC-Co-Cr) se pulverizó mediante una pistola neumática sobre el sustrato de aleación con base de titanio (Ti-6Al-4V) y posteriormente se irradió mediante un láser de CO2 utilizando el método de fusión de lecho de polvo (L-FLP). El objetivo era evaluar los parámetros de funcionamiento y las propiedades mecánicas y físico-elementales del recubrimiento. Para ello, se utilizó un láser de CO2 de 70 W para irradiar el polvo de WC-Co-Cr pre-depositado con una densidad de energía de 7x104 W/cm². Teniendo en cuenta los parámetros del láser, los mejores resultados se obtuvieron a una velocidad de desplazamiento lineal del haz de unos 30 mm/s. Allí se observó una unión metalúrgica entre el revestimiento y el sustrato, lo que favoreció una fuerte adherencia entre ambos. Además, se observaron regiones con una capa depositada totalmente densa con un espesor de aproximadamente 20 μm. Sin embargo, se verificó la presencia de poros debidos a gases de descarbonización del WC atrapados. A pesar de este problema y de otros, como grietas, el revestimiento mostró un aumento sustancial de la dureza superficial. Al mismo tiempo, se produjo una gran disminución del coeficiente de fricción y una reducción significativa de la tasa de desgaste
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