Microstural Effects and Large Microhardness in Hypereutectic Al-Fe Alloy Processed by Laser Surface Remelting
Resumen
In this work hypereutectic Al-2.0 wt% Fe alloy was used, the whole surface of the sample was covered with consecutive and superimposed weld fillets by means of laser surface remelting (LSR) technique. Microstructure was analyzed by optical microscopy, field-emission scanning electron microscopy and Vickers technical. Results obtained in this study indicate in LSR-treatment occurred rapid heating and followed by rapid cooling, resulting in formation of a thin recast layer with a refined microstructure, with dissolution of precipitates and inclusions, and formation of metastable phases, devoid of microcracks in the cast region and with smaller protuberance on the weld fillets, resulting so a homogeneous characteristic of the treated region that the substrate. Furthermore, analysis of Vickers hardness was done in the cross-sectional area of treated sample and on the treated sample surface. Resulting in a greater microhardness of the treated region than untreated substrate.Citas
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