Laser reinforcement of light industrial part surface with synthetic amorphous/nanocrystalline composites
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Ultrafine nanocrystals (UNs) and amorphous phases reinforced composites were fabricated on the bearing substrate produced of the titanium alloy by mean of the laser cladding (LC) of Stellite-Ceramics mixed powders, which improved the wear resistance of the substrate surface. An aim of this study is to investigate the microstructural characterization, phases constitute and wear behavior of such laser clad composites (LCCs). Test results indicated that the grain size/orientation in the different areas maintained highly consistent in middle region of the StelliteSF 12-NB-Sb LCCs, also three distinctive regions with varies equiaxed crystals in sizes can be distinguished, which showed a strong (101) orientation; the various types of phases were obtained for the bottom-composites due to the dilution effect and the extreme rapid cooling rate of the bottom-pool; the amorphous phases could not be free to grow up during crystallization process due to suppressions of UNs, resulting in the nanosize microstructure. To have a quantitative understanding of strengthening effects, this paper has provided laser-induced related theoretical basis to fabricate the ceramics reinforced composites on the light industrial part.
This work was supported by National Natural Science Foundation of China (Grant No. 51505257) and project ZR2019YQ25 supported by Shandong Provincial Natural Science Foundation.