Superabrasive elements, methods of manufacturing, and drill bits including same

A rotary drill bit, comprising:

• a bit body configured to engage a subterranean formation;
• and
• a plurality of polycrystalline diamond cutting elements affixed to the bit body, at least one of the polycrystalline diamond cutting elements including:
• a substrate;
• and
• a pre-sintered polycrystalline diamond body bonded to the substrate, the pre-sintered polycrystalline diamond body including an upper surface, an interfacial surface located at least proximate to the substrate, and a plurality of bonded diamond grains defining a plurality of interstitial regions, the pre-sintered polycrystalline diamond body further including:
• a first region extending inwardly from the interfacial surface and including an infiltrant disposed in the interstitial regions thereof, wherein the infiltrant includes at least one member selected from the group consisting of iron, nickel, cobalt, and an iron-nickel-based braze alloy;
• and
• a second region from which the infiltrant has been at least partially removed to a selected depth, the second region extending inwardly from the upper surface.

A method of fabricating a polycrystalline diamond compact, comprising:

• sintering diamond particles in the presence of a catalyst to form a polycrystalline diamond body including the catalyst disposed therein;
• at least partially removing the catalyst from the polycrystalline diamond body;
• after at least partially removing the catalyst from the polycrystalline diamond body, positioning the polycrystalline diamond body and a substrate at least proximate to each other, wherein the substrate includes an infiltrant comprising at least one member selected from the group consisting of iron, nickel, and cobalt;
• subjecting the polycrystalline diamond body and the substrate positioned at least proximate to each other to a high-pressure/high-temperature process to infiltrate the polycrystalline diamond body with the infiltrant from the substrate, thereby forming an infiltrated polycrystalline diamond body;
• and
• at least partially removing the infiltrant from a region of the infiltrated polycrystalline diamond body, wherein the region extends inwardly from an exterior surface of the infiltrated polycrystalline diamond body to a selected depth.