Abstract

MAMPURU, L.A.; MARUMA, M.G.  and  MOEMA, J.S.. Grain refinement of 25 wt% high-chromium white cast iron by addition of vanadium. J. S. Afr. Inst. Min. Metall. [online]. 2016, vol.116, n.10, pp.969-972. ISSN 2411-9717.  https://doi.org/10.17159/2411-9717/2016/v116n10a12.

Mill liner wear is a major cost item in the mining industry and there is continuous research to prolong the life of the liners. Over the years it has become apparent that even though high-chromium white cast irons are highly efficient as abrasion-resistant materials, a combination of wear resistance and fracture strength remains difficult to achieve. Increasing the hardness of the high-chrome white cast iron (HCWCI), which improves the resistance to abrasion wear, is often accompanied by a deterioration in fracture strength. Operational conditions inside the mill require that the liner should be made of highly wear-resistant material with some fracture strength. Vanadium additions ranging from 0.2 to 3 wt% were made to HCWCI in an attempt to refine the microstructure. It was found that an increase in vanadium content promotes grain refinement. A content of 1.5-3 wt% gave the best results as measured by the maximum breaking strength.

Keywords : HCWCI; mill liners; grain refinement; hardness.

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