Method of heat treating high carbon alloy steel parts to develop

Details Method of heat treating high carbon alloy steel parts to develop Method of heat treating high carbon alloy steel parts to develop

1978-09-13

1980-03-04

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 39, C21D 148

Patent

active

041915992

ABSTRACT:
A method of developing compressive residual stresses in the surface region of a high carbon steel alloy article is disclosed. The article is made of an alloy having 0.8-1.6% C, 0.2-5% Cr, 0-20% ingredients selected from the group consisting of M.sub.N, V, Mo, W, Si, and the remainder Fe. The article is heated in a carburizing atmosphere at 800.degree.-950.degree. C. for 1-2.5 hours, and then quenched to cool the central core of the article at a rate sufficiently fast to suppress the formation of non-martensitic austenite decomposition products, thereby establishing a residual compressive stress gradient proceeding from the surface to a depth of 0.007-0.03 inches.

REFERENCES:
patent: 2299138 (1942-10-01), Gier
patent: 3117041 (1964-01-01), Koistiner
patent: 3385739 (1968-05-01), Davis
patent: 3922181 (1975-11-01), Woodilla et al.

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