Microstructural features of an iron-based laser coating

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J Mater Sci | / 14卷 / 3355-3361期
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Iron alloys - Laser applications - Metallographic microstructure - Wear resistance - Composition - Phase transitions - Tempering - High temperature reactors - Electron microscopy - X ray analysis - Aging of materials - Hardening;
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摘要：
A high toughness wear resistant coating is produced by laser clad Fe-Cr-W-Ni-C alloys. The microstructural and compositional features of the laser-solidified microstructures and phase evolutions occurring during high temperature tempering at 963 K were investigated by using analytical electron microscopy with energy dispersive X-ray analysis. The clad coating possesses the hypereutectic microstructure consisted of M7C3 + (γ + M7C3). During high temperature aging, the precipitation of M23C6 and M2C in austenite and in situ transformation of dendritic M7C3 to M23C6 and eutectic M7C3 to M6C occurred. The laser clad coating reveals an evident secondary hardening and superior impact wear resistance.
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