WEAR RESISTANT WELD OVERLAY ON DOWNHOLE MINING COMPONENTS

摘要

A rock bit including a bit body having an upper end adapted to be detachably secured to a drill string; at least one roller cone; at least one cutting element disposed on the at least one roller cone; and a wear resistant weld overlay on at least a portion of an external surface of the rock bit, wherein the wear resistant weld overlay comprises a steel nanocrystalline material having at least one metal borocarbide precipitant dispersed therein is disclosed.