| 摘要 |
PURPOSE:To obtain a sintered hard alloy for warm or hot forging having improved resistance to heat checking and chipping by combining a hard phase of WC with a specified percentage of a binding metallic phase of an iron group metal contg. Cr, Mo or W in the form of a solid soln. CONSTITUTION:A sintered hard alloy is composed of a hard phase of WC and 15-30wt% binding metallic phase of one or more among Ni, Co and Fe as iron group metals contg. about 0.5-10% one or more among Cr, Mo and W in the form of a solid soln. or further contg. about 0.1-5% one or more among B, Al, Si, Mg and Ca. The surface of a substrate of the sintered hard alloy is preferably coated with one or more among TiC, TiN, TiCO, TiCNO and Al2O3. By the composition the alloy as the material of a warm or hot forging tool has increased hardness at high temp. and a reduced coefft. of thermal expansion.
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