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This research studies the effect of dynamic solidification, niobium addition, and their combined action on the as-cast structure and mechanical properties of hypoeutectic 15% Cr-2% Mo white cast irons containing 2.5% C. The effect of heat treatment at different tempering temperatures was also studied. Investigations were performed by means of image analysis, scanning electron microscopy, and X-ray diffraction. Abrasion resistance and impact toughness tests were performed. Fracture and worn surfaces were studied. Results show that optimized abrasion resistance and impact toughness can be achieved in a homogeneous microstructure consisting of hard, fine, and non-interconnected carbides in a matrix that has a high fraction of metastable austenite.

Microstructure – wear performance relationship of hypoeutectic 15% Cr-2% Mo white iron