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Microstructure and Wear Resistance of Arc-Sprayed NiCrBSi Coatings after Remelting


 The anti-wear coatings in this study are developed for the use in forming tools, which need a good resistance against different wear mechanisms such as surface fatigue, adhesion and abrasion. NiCrBSi is suitable for this purpose because of its high resistance against different types of wear at ambient and high temperatures. Due to the low thermal and kinetic energy during the spraying process, the arc-sprayed NiCrBSi coating shows a high interlaminar boundary porosity as well as numerous interface cracks between the coating and the substrate, which can reduce the wear resistance and the adhesion to the substrate. In this work, arc-sprayed NiCrBSi coating were remelted by a treatment with an oxyacetylene flame, induction heating, furnace and laser. The treatment parameters were investigated and optimized. The modified microstructure was characterized using an optical microscope and a scanning electron microscope as wells as an EDS analysis. The hardness of the coatings was evaluated before and after remelting. To examine various wear mechanisms, pin-on-disc tests were conducted with different wear counterpart. The wear and coefficients of the as-sprayed and remelted coating were determined. In order to show the change of the wear resistance as well as the wear mechanisms, wear tracks were characterized with a scanning electron microscope.