From the composition, original structure to quenching and tempering process, many factors affect the content of retained austenite after quenching and tempering. Quenching cooling rate. Without non martensitic transformation, the slower the cooling rate is, the more the retained austenite content is. For example, the retained austenite content of GCr15 steel quenched at 850 ℃… Read more Factors affecting the volume of retained austenite