Leblond Kinetic Transformation Model
The Leblond kinetic transformation model describes phase-dependent microstructure transformations mathematically under different thermal cycles. It helps predict phase fractions and structure.
Physical-Chemical Working Principle
The model uses differential equations to describe the rate of phase transformations. It accounts for phases such as austenitic, ferritic, and martensitic structures.
Metallurgical Relevance & Risks in Welding
The model is important for optimizing welding processes to achieve desired microstructures. Incorrect settings can lead to unwanted structures, such as too much martensite, which causes hardness and cracking.
Shop Practice & Procedures
Use the model to define the optimal weld cooling curve. For steels with high carbon content (e.g., HSS), slow cooling is necessary to avoid martensite. For lower carbon contents, faster cooling may be appropriate.