Patent ID: 8216677

Claim:
A polycrystalline diamond compact, comprising: a cemented carbide substrate including a first cemented carbide portion that is substantially free of chromium carbide and a second cemented carbide portion bonded to the first cemented carbide portion, the second cemented carbide portion including chromium carbide, the second cemented carbide portion at least partially surrounding a lateral periphery of the first cemented carbide portion; and a polycrystalline diamond table bonded to at least the first cemented carbide portion, the polycrystalline diamond table including a plurality of bonded diamond grains exhibiting diamond-to-diamond bonding therebetween, the plurality of bonded diamond grains defining a plurality of interstitial regions, at least a portion of the polycrystalline diamond table including chromium present in a concentration less than about 1.0 weight % (“wt %”).