Retained Austenite Content
The retained austenite content is the fraction of austenite that does not transform to martensite during cooling. It influences deformation behavior and toughness.
Physical-Chemical Mechanism of Action
After welding, part of the austenite remains in the material if it is not completely transformed to martensite. This retained austenite content depends on the cooling rate and the filler materials.
Metallurgical Relevance & Risks in Welding
A high retained austenite content can impair deformation behavior, as austenite is less formable than martensite. This leads to increased toughness and lower durability under mechanical load.
Workshop Practice & Instructions
To control the retained austenite content, pay attention to an optimal cooling rate. For highly stressed applications, use welding processes with low retained austenite or refine the microstructure through heat treatments.