Caracterização microestrutural e análise de textura cristalográfica do aço maraging 300 produzido por manufatura aditiva

Abstract

Maraging steels are required by industries, mainly aeronautics and naval, for their mechanical resistance and toughness, as well as good resistance to corrosion and ductility. But its great differential is in the ability to become more resistant through heat treatments of aging. As the classes 300 and 350 of steel are more widespread, with this, we try to find and understand their properties and develop new ways of producing this material. For this purpose, it was used maraging 300 produced by additive manufacture, Direct Metal Laser Signaling (DMLS), which was treated and analyzed in three states: as received, solubilized (820ºC/1h) and aged (480°C/5h). The material in the three states was subjected to X-ray diffraction for the production of poles and ODF, making possible a texture analysis, optical microscopy and scanning electron, making possible the characterization of the microstructure generated by the fabrication technique, and microhardness, for selection of effectiveness of thermal treatments in comparison to the material as received. There was presence of dispersed phases of Ti and Al oxides in the three states, in addition to the reduction of the solubilized state microhardness and increase in the aged state when compared to the material as Received.