A 4-step heat treatment for hardening case-carburized steels has been developed and is here described and compared with conventional hardening. In step 1 of this new method, steel is case carburized and oil quenched; much higher than normal carburizing temperatures can be used. Step 2 eliminates retained austenite by heating in the bainite region, for example, 700 F for 2 h. Step 3 is a rapid austenitizing treatment followed by an oil quench, and step 4 a temper at ∼400 F.Three representative grades of low-alloy steels were investigated to determine their response to this new hardening treatment and to explore the variables which influence the product. It is shown that the treatment permits faster carburizing without affecting the quality of the case by carburizing at least as high as 1900 F.The new 4-step hardening method is shown to have the following principal advantages over conventional methods:
Method of Hardening Case-Carburized Steels
Sae Technical Papers
1973 International Automotive Engineering Congress and Exposition ; 1973
1973-02-01
Conference paper
English
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