Process for the improved heat treatment of steels using direct electrical resistance heating
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United States of America Patent
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Sep 13, 1983
Grant Date -
N/A
app pub date -
Dec 10, 1980
filing date -
Dec 10, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for the energy efficient heat treatment of steels wherein a steel workpiece is rapidly heated to a temperature above the A.sub.3 temperature of the steel to convert the steel to austenite, the workpiece is then rapidly quenched in a liquid quench medium to convert the austenite to a predominantly martensitic microstructure, and the steel is then tempered by rapid heating while the workpiece is under tension, the tempering serving to convert the steel to a tempered martensitic form. The present invention virtually eliminates the problem of quench cracking and minimizes quench distortion as well as providing a finished product with improved uniformity, improved surface quality, and improved mechanical properties.
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