US Patent 11647698 Chopper blade with hard face

A chopper blade for use in an agricultural harvester chopper to chop crop residue comprises a blade body and a hard face. The blade body comprises a cutting edge of the chopper blade. The hard face is applied on a surface of the blade body, and is harder than the blade body. The hard face comprises a serration pattern along a cutting edge such that the cutting edge wears to the serration pattern to match the serration pattern to form corresponding serrations in the cutting edge with the serration pattern becoming part of the cutting edge of the chopper blade during use of the chopper blade.