Improvement of Wear Resistance of Stainless Steel AISI 304L by Diode Laser Surface Alloying with Chromium Carbide

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Metal matrix composite layers were fabricated on AISI 304L substrate by diode laser surface alloying with direct injection of chromium carbide Cr3C2 powder into the molten-pool. The influence of laser alloying parameters on the quality of the alloyed layers were investigated. The alloyed layers were examined by optical metallography and scanning electron microscopy. Comparative erosion tests between the AISI 304L substrate and the alloyed layers have been performed following the ASTM G 76 standard test method. The uniform laser beam intensity profile of the laser used ensures to produce fully dense alloying layers with homogenous distribution of Cr3C2 particle throughout the matrix alloy. Distribution and dissolution of Cr3C2 particles are strongly dependent on the laser power level. The alloyed layers exhited noticeable increased erosion resistance in comparison to AISI 304L substrate for both 30° and 90° impact angles.

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363-368

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November 2015

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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