Austenite Decomposing Model

The DANTE Austenite Decomposing model is carbon and chemical composition dependent.
Upper and lower bainite are treated as separate phases.
Carbon in austenite is affected by heating time and temperature with initial carbide decomposing.
Austenite decomposing model includes phase transformations of austenite to diffusive phases and martensite during cooling or quenching.
Transformations are time and temperature dependent.
DANTE uses analytical equations instead of TTT diagrams for robustness.
TTT diagrams can be plotted from material database to view the materials behavior.

Phase transformations during cooling (quenching) are chemical composition (carbon and alloy content) and grain size dependent
Chemical composition can be specified directly in the 3D FEA models.
The strains caused by temperature change and phase transformations are described effectively.

Latent Heat Model due to Phase Transformation

Effective material model considering the latent heat from austenitizing and austenite decomposing.
- For fast heating processes (induction hardening or laser hardening), the latent heat effect on austenitizing depth is significant.
- The latent heat effect of bulky parts with martensitic transformation is significant.

Auto Tempering Model During Quenching or Cooling

For alloys with high martensite start temperature (Ms), the auto temper of formed martensite during cooling is modeled.
- This capability is essential for accurately predicting hardness, since the hardness of tempered martensite depends on the specific tempering conditions, including the cooling rate.

Carbon Partitioning Model

During cooling, the carbon in austenite increases while forming ferrite (carbon partition).
- With higher carbon in austenite, the material’s hardenability increases, and Ms decreases.
- The material model is helpful to more accurately predict the residual stress, distortion, and hardness of heat-treated parts.
Depending on the heat treatment process history, the actual carbon in each phase can be different.

Initial Carbide Decomposing Model during Austenitizing

With different carbides and carbide size in the initial material, their decomposing rates in austenite are different.
- The amount of carbon in austenite solution is modeled by the carbide decomposing material model.
- This material model is necessary for modeling high carbon steel with a portion of carbide in solution during austenitizing (AISI 52100)
- This material model is necessary for high heating rate austenitizing processes: induction hardening and laser hardening.

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