CARBIDE-FREE BAINITE AND RETAINED AUSTENITE STEELS, PRODUCING METHOD AND APPLICATIONS OF SAME
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United States of America Patent
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Issued Date -
Apr 25, 2024
app pub date -
Dec 6, 2023
filing date -
Dec 6, 2023
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Abstract
One aspect of this invention relates to a method for producing a carbide-free bainite and retained austenite steel. The method includes providing an iron alloy containing a composition designed according to property objectives of the carbide-free bainite and retained austenite steel; heat-treating the alloy to a temperature above a temperature at which a transformation from ferrite into austenite is finished; succeedingly quenching the heat-treated alloy to a bainite region at a temperature between a first temperature at which a martensitic transformation starts in the alloy and a second temperature at which a coupled diffusional/displacive bainitic transformation starts the alloy; and optimally cooling the quenched alloy to form to form the carbide-free bainite and retained austenite steel that meets the property objectives, with a cooling ratio precisely controlled so that the temperature of the alloy continues to be slightly above the first temperature which keeps decreasing during the optimally cooling step.
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