Fine structure of excess ferrite with diffusion decomposition of austenite
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Conclusions
- 1.
The morphology and dislocation arrays in excess ferrite vary with the transformation temperature and holding time.
- 2.
At 700 and 650° ferrite is precipitated largely in the grain boundaries. At 650° sections of Widmanstätten ferrite appear after a short time. At 600° the Widmanstätten structure of ferrite is predominant.
- 3.
The dislocation density of the ferrite increases with decreasing temperatures of the γ→α transformation. Widmanstätten ferrite has a fragmented substructure.
- 4.
With increasing holding times at all temperatures the dislocations are redistributed and the density decreases.
- 5.
At 650 and 600° a polygonal structure is formed in the ferrite, and the fragmented substructure of Widmanstätten ferrite is rebuilt into a subgrain structure. At 700° polygonization is less evident due to the mobility of high-angle boundaries.
Keywords
Ferrite Austenite Fine Structure Dislocation Density Transformation TemperaturePreview
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Literature cited
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