Effect of Al on the Mocrotructure and Properties of Wear Resistance High Chromium Cast Iron
The experiment results show that with the increase of Al content,Al prefers to be oxidated and form dense oxidation film on the surface,thus increases oxidation resistance obviously and improves hardness and wear resistance in the cast iron containing 26% Cr.The good combination of high hardness,excellent wear resistance and good oxidation resistance can be obtained when the carbon equivalent is less than 2.3% and Al is about 4%.The as-cast structure is α-Fe+M7C3 and the grain is fine and well-distributed.If the Al content is increased further,oxidation resistance increases slightly,but the impact toughness devreases sharply.