Iron piston having selectively hardened ring groove

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

1985-03-28

1987-02-17

Chambers, A. Michael

Expansible chamber devices

Piston

Open-ended hollow skirt type

123193P, 277224, 277DIG6, 148152, C21D 500

Patent

active

046430792

ABSTRACT:
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 microstructure having a Knoop hardness of preferably at least 690. In a preferred embodiment, the groove faces are hardened by a stripe hardening process.

REFERENCES:
patent: 2500566 (1950-03-01), Philipps
patent: 3712099 (1973-01-01), Elsbett et al.
patent: 3837934 (1974-09-01), Pfoffmann et al.
patent: 4124413 (1978-11-01), Komatsu et al.
patent: 4161321 (1979-07-01), Hendrixon et al.
patent: 4336077 (1982-06-01), Leach et al.

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