Constituents of Steel
Products of diffusion-controlled transformations.
Products of diffusionless athermal transformations.
Products of precipitation before or during solidification due to limited solid solubility, or pick-up from external sources.
The interface between two grains where the crystal lattice changes from that of one grain to that of the other grain.
There are three types of grain boundaries in Fe-based alloys: ferrite, austenite and prior-austenite. The prioraustenite grain boundaries are those of the parent (austenite) phase before transformation. Ferrite and austenite grain boundaries are those of the product phase, although there are compositions where allotropic transformations do not occur.