NITRIDED PISTON RING RESISTANT TO CRACK PROPAGATION

摘要

SUMMARY Patent of Invention: "NITRIDED PISTON RING RESISTANT TO THE PROPAGATION OF CRACKS". This invention refers to the solution of problem of spalling of the nitrided layer in piston rings for Flex-fuel engines, without jeopardizing the wear resistance, suggesting for such purpose a nitrided piston ring (100,100') equipped with two nitrided layers (1,2), with metallic base (3) composed mainly of iron and whose superficial hardness presented is of about 800 Vickers, decreasing in a substantially linear manner up to about 400 Vickers for a distance to the surface of up to 90 microns (µm).