Abstract
The influence of a Mo addition on the interfacial morphologies and corrosion resistances of novel Fe-Cr-B alloys in molten aluminum at 750 °C was systematically investigated using scanning electron microscopy, X-ray diffractometer, electron probe microanalysis, and transmission electron microscopy. The results indicated that Mo could not only strengthen the matrix but also facilitate the formation of borides. Furthermore, the microstructures of Mo-rich M2B boride changed from a local eutectic net-like structure to a typical coarse dendritic structure and a blocky hypereutectic structure with increasing Mo addition. This was true of the blocky Mo-rich M2B boride, rod-like Cr-rich M2B boride and the corrosion products, which had a synergistic effect on retarding of the diffusion of molten aluminum. Notably, the corrosion resistance of the Fe-Cr-B-Mo alloy, with an 8.3 wt.% Mo addition, was 3.8 times higher than that of H13 steel.
Highlights
It is acknowledged that molten aluminum is one of the most aggressive metal melts due to its high chemical activity it can inevitably react with most other metals [1,2]
To further of pristine matrix and the corrosion products, thin foil samples were prepared by mechanical thinning understand themilling, phase compositions of pristine matrix and the corrosionelectron products, thin foil samples followed by ion which were observed under a transmission microscope (TEM, were prepared by mechanical thinning followed by ion milling, which were observed under a TECNAL G2 S-TWIN F20, FEI, Hillsboro, USA) with selected area electron diffraction (SAED) analysis transmission electron microscope and an energy dispersive spectrometer(TEM, (EDS).TECNAL G2 S-TWIN F20, FEI, Hillsboro, USA) with selected area electron diffraction (SAED) analysis and an energy dispersive spectrometer (EDS)
This work mainly investigated the influence of Mo addition on interfacial morphologies and the corrosion resistances of Fe-Cr-B alloys in static molten aluminum at 750 °C
Summary
It is acknowledged that molten aluminum is one of the most aggressive metal melts due to its high chemical activity it can inevitably react with most other metals [1,2]. Especially in cast dies and hot dip aluminizing production process, a wide range of metallic components, such as crucibles, die-casting molds and charging cylinders, are in contact with molten aluminum or its alloys. These components suffer from serious corrosion while melting and can even fail [3,4]. In related studies, cast B-added steel has a high hardness and corrosion resistance to molten zinc due to its 3D net-like boride [18,19]. The present work aims to prepare a kind of novel Fe-Cr-B alloy with different contents of Mo and their interfacial morphologies and corrosion resistances in molten aluminum were investigated
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