Surface hardening thermal treatment

Details Surface hardening thermal treatment Surface hardening thermal treatment

1982-09-28

1984-09-11

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 315, 148 39, C21D 120, C21D 932

Patent

active

044708548

ABSTRACT:
A steel product, particularly a heavy-duty gear, having a case of martensite and a core of lower bainite with a Vickers hardness of not less than Hv 600 is obtained by subjecting a medium carbon alloy steel comprising, by weight, 0.45 to 0.60% C, up to 0.50 Si, 0.40 to 1.30% Mn, up to 4.00 Ni, 0.35 to 0.55% Cr, up to 0.70 Mo, balance Fe and incidental impurities to a carbonitriding treatment at a temperature of 800.degree. to 900.degree. C., austempering the carboritrided steel by quenching it in a hot bath of 230.degree. to 300.degree. C. and retaining the steel in the hot bath of the aforementioned temperature for a suitable duration enough to transform the core of the steel into lower bainite and not enough to cause any transformation of the case of the steel, and subsequently cooling the steel.

REFERENCES:
patent: 3492116 (1970-01-01), Kenneford et al.
patent: 4049472 (1977-09-01), Arndt
patent: 4049473 (1977-09-01), Davis et al.
patent: 4145232 (1979-03-01), Solomon
patent: 4173501 (1979-11-01), Hildebrandt et al.
patent: 4225365 (1980-09-01), Rice
patent: 4406714 (1983-09-01), Bowes et al.
Metals Handbook, Ninth Edition, "Carbonitriding", American Society for Metals, Metals Park, Ohio, 1981, pp. 176-190.

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