Iron piston having selectively hardened ring groove

Details Iron piston having selectively hardened ring groove Iron piston having selectively hardened ring groove

C - Chemistry, Metallurgy

21

D

121/87

C21D 5/00 (2006.01) C21D 9/00 (2006.01) F16J 9/22 (2006.01)

Patent

CA 1246404

IRON PISTON HAVING SELECTIVELY HARDENED RING GROOVE Abstract of the Disclosure A cast iron piston characterized by a pearlitic matrix microstructure comprises a ring groove defined by opposed faces that are selectively hardened adjacent the piston side wall. The hardened surfaces are characterized by a martensitic matrix micro- structure having a Knoop hardness of preferably at least 690. In a preferred embodiment, the groove faces are hardened by a stripe hardening process.

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