Retained Austenite

Physicochemical Mechanism of Action

After quenching, part of the metal stays in a state that is not transformed into martensite or bainite. This portion is called retained austenite.

Metallurgical Relevance & Welding Risks

Retained austenite can hurt the mechanical properties, especially strength and toughness. That raises the susceptibility to cracks and distortion.

Workshop Practice & Instructions

To minimize retained austenite, correct cooling is decisive. That includes using shielding gas like argon or covering the joint until it has cooled completely. Cooling too fast can create retained austenite, cooling too slowly reduces it.