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Abstract

A body comprising a steel substrate and a hard face structure fused to the steel substrate, the hard face structure comprising a core region and an intermediate region, the intermediate region at least partially enclosing the core region and comprising at least about 0.5 weight % Si, at least about 3 weight % Cr and at least about 10 weight % W and substantially the balance of the intermediate region consisting of an iron group metal M and carbon, M being selected from Fe, Co and Ni or an alloy thereof, and the intermediate region including a plurality of crystallites comprising at least one eta-phase or theta-phase according to the formula M_xW_yC_z, where x is in the range from 1 to 7, y is in the range from 1 to 10 and z is in the range from 1 to 4, or a mixture of an eta-phase and a theta-phase according to the formula; the core region comprising at least about 1 weight % Si, at least about 5 weight % Cr, at least about 40 weight % W and substantially the balance of the core region consisting of M and carbon, the core region including grains comprising WC and grains comprising (M,Cr),C₃ or grains comprising (M,Cr)₂₃C₆, or grains comprising (M,Cr)₇C₃ and grains comprising (M,Cr)₂₃C₆, the grains being dispersed in core region matrix material comprising more than 50 weight % of the M containing Cr, W and Si in solid solution therein; the intermediate region being substantially free of WC grains.

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First Claim