Retained austenite refers to the austenite fraction that remains in the microstructure after quenching. In certain applications, particularly when using high-alloy tool steels, the retained austenite content of a steel can have a decisive influence on its usability and quality. While high retained austenite contents are deliberately adjusted in some applications such as carbonitriding to improve fatigue strength, undesired microstructural changes during service can lead to dimensional changes and rejection in other components.

The targeted transformation of retained austenite through cryogenic treatment or multiple tempering, as well as its deliberate stabilization, represent different strategies for achieving the desired material properties. The seminar demonstrates when retained austenite should be considered a curse or a blessing, how it influences mechanical properties, and which methods are available for targeted control.

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