Patent ID: 8876443

Claim:
A composite article that is one of a rotary cutting tool and a rotary cutting tool blank selected from a drill, a drill blank, an end mill, an end mill blank, a tap, and a tap blank, the composite article comprising an elongate portion including: an outer region comprising a first cemented carbide; and an inner region autogenously bonded to the outer region and comprising a second cemented carbide; wherein the outer region and the inner region are coaxially disposed with the inner region comprising a core region of the elongate portion; wherein at least one of the first cemented carbide and the second cemented carbide comprises a hybrid cemented carbide comprising: a cemented carbide dispersed phase; and a cemented carbide continuous phase; wherein at least one of the cemented carbide dispersed phase and the cemented carbide continuous phase comprises at least 0.5 percent by weight of cubic carbide based on the weight of the phase comprising the cubic carbide; and wherein one of the first cemented carbide and the second cemented carbide is a non-hybrid cemented carbide, wherein the non-hybrid cemented carbide, the cemented carbide dispersed phase of the hybrid cemented carbide, and the cemented carbide continuous phase of the hybrid cemented carbide each independently comprise: 60 to 98 percent by weight of at least one transition metal carbide selected from the group consisting of titanium carbide, chromium carbide, vanadium carbide, zirconium carbide, hafnium carbide, tantalum carbide, molybdenum carbide, niobium carbide, and tungsten carbide; and 2 to 40 percent by weight a binder comprising at least one material selected from the group consisting of cobalt, a cobalt alloy, nickel, a nickel ally, iron, and an iron alloy.