Metal treatment – Compositions – Heat treating
Patent
1977-08-24
1979-10-09
Steiner, Arthur J.
Metal treatment
Compositions
Heat treating
148 38, 148134, C22C 3818
Patent
active
041704975
ABSTRACT:
A high strength, tough alloy steel is formed by heating the steel to a temperature in the austenite range (1000.degree.-1100.degree. C.) to form a homogeneous austenite phase and then cooling the steel to form a microstructure of uniformly dispersed dislocated martensite separated by continuous thin boundary films of stabilized retained austenite. The steel includes 0.2-0.35 weight % carbon, at least 1% and preferably 3-4.5% chromium, and at least one other substitutional alloying element, preferably manganese or nickel. The austenite film is stable to subsequent heat treatment as by tempering (below 300.degree. C.) and reforms to a stable film after austenite grain refinement.
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McMahon et al., "Development of Economical, Tough, Ultra-High Strength Fe-Cr-C Steels", Proc. 3rd , M. Conf. on Strength of Metals & Alloys, Cambridge, Ms., Metals, London, 1973, pp. 180-184.
Rao Bangaru V. N.
Thomas Gareth
Steiner Arthur J.
The Regents of the University of California
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