Process for strengthening of carbon steels

Details Process for strengthening of carbon steels Process for strengthening of carbon steels

1976-04-16

1977-08-09

Stallard, W.

Metal treatment

Compositions

Heat treating

148 12F, 148 124, 148 36, 148154, C21D 952

Patent

active

040408728

ABSTRACT:
A process for the strengthening of carbon steels wherein a hypoeutectoid carbon steel workpiece, preferably in the shape of a rod or a bar, is rapidly heated to a temperature completely within the austenite region at a rate sufficient to minimize grain growth of austenite grains, the resulting austenitized steel workpiece is quenched to transform the steel to a fine mixture of acicular proeutectoid ferrite and a finely divided eutectoid aggregate of ferrite and iron carbide, followed by working at a temperature ranging up to the critical lower temperature to strengthen the steel. The process of the invention provides a drastic increase in both strength and ductility as compared to untreated steels such as those obtained by hot rolling.

REFERENCES:
patent: 3178324 (1965-04-01), Grange et al.
patent: 3507710 (1970-04-01), Grange et al.
patent: 3666572 (1972-05-01), Nakagawa et al.
patent: 3699797 (1972-10-01), Tournoy
patent: 3855013 (1974-12-01), Prohaszka et al.
patent: 3865636 (1975-02-01), Suzuki et al.

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