Abstract
The influence of sub-zero treatments on erosion and abrasion resistance of a high chromium white cast iron with different amounts of nickel and silicon was investigated. It was found that nickel stabilises the residual austenite in white irons, decreasing their wear resistance. On the other hand, the corrosion resistance of these alloys is improved by nickel addition. Silicon was found to be an austenite-destabilising element increasing the γ → M transformation temperature. Up to 58% of predominantly austenitic matrix in the alloys containing 3.8% Ni is transformed to martensite by the addition of 3.6% Si and the application of sub-zero treatments. A tempered martensite matrix structure was found to offer the best resistance to both erosion and abrasion. SEM observations revealed that a martensitic matrix, because of its high hardness, can effectively support the massive carbides by preventing their fracture during abrasion and erosion processes.
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