Abstract
Abstract The nanometer Al 2 O 3 dispersion strengthened Fe–Cr–Mo composite coatings by crosscurrent CO 2 laser on 316L steel were produced. The microstructure and phase composition of the coatings were examined through optical microscopy and X-ray diffraction analyses. Hardness distribution, tensile properties and wear resistance of the coatings were determined to analyse the mechanical properties and the strengthening mechanism of the cladding layer. Results showed that Al 2 O 3 was partly dissolved, and produced Fe 3 Al intermetallic compound; this new phase and Al 2 O 3 feature fine grain, high hardness, high tensile strength, and excellent wear resistance. Fe–Cr–Mo steel with 8 wt.% Al 2 O 3 was considered appropriate for uniformity of the microstructure. Under the same proportion with micro-Al 2 O 3 , the nano-Al 2 O 3 was easily melted and generated Fe 3 Al. Improved hardness and wear resistance could be ascribed to the high bonding strength of Al 2 O 3 reinforced phase to the matrix through the transition of Fe 3 Al intermetallic compound.
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