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In the martempering process, austenitized metal part is immersed in a bath at a temperature just above the martensite start temperature (Ms). Interrupted quenching involves halting the cooling process at a temperature above the martensite transformation region, allowing sufficient time for the center of the workpiece to reach the same temperature as the surface. The metal part is then removed from the bath and cooled in air to room temperature to permit the austenite to transform to martensite. Martempering is a technique used to control the stresses and strains that develop during the quenching of a steel component. In this process, the steel is heated above the critical range to transform it entirely into austenite.
The drawback of this process is that the large section cannot be heat treated by this process.
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