75% FeSi Alloy

Alloy name: 75% FeSi
Diagram No.: 1119
Type of diagram: TTT
Chemical composition in weight %: 75% FeSi
Alloy group: Ferroallloys
Note: TTT-diagram for refined 753 ferrosilicon where 12% of the a phase had initially transformed.
In figure the results are shown in a ttt-diagram. Two lines are shown in the diagram, the line for 80% of the alpha phase transformed and the line for 50% of the alpa phase transformed. The figure shows that the rate of transformation is fastest at 700-750C and decreases fast outside that interval. According to the phase diagram the temperature at which alpha and beta are in equilibrium is 937C. When the temperature is close to the equilibrium the driving force for the transformation is small and the transition goes therefore at a slow rate. At temperature well below 937C the undercooling is larger and the transition goes faster. But when the undercooling becomes to large, diffusion of atoms becomes the limiting factor and the transition again slows down.
Reference: Not shown in this demo version.

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