S. B. Singh1 and H. K. D. H. Bhadeshia2

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Presentation transcript:

Strain-induced Stabilisation of Austenite Against Bainite Transformation S. B. Singh1 and H. K. D. H. Bhadeshia2 1Indian Institute of Technology, Kharagpur, India 2University of Cambridge, UK

Si to suppress carbide precipitation Fe - 0.12 C - 2.0 Si - 3.0 Mn (wt%) High hardenability Si to suppress carbide precipitation

Dilatation curves for bainite

500 oC, e = 0 475 oC, e = 0

Inhomogeneous nature of deformation (barrelling) leads to non-uniform microstructure along the compression axis.

500 oC, e = 0.18, edge 500 oC, e = 0.18, center

500 oC, e = 0.69, center

475 oC, e = 0.18, edge 475 oC, e = 0.18, center

475 oC, e = 0.36, edge 475 oC, e = 0.36, center

475 oC, e = 0.69, edge 475 oC, e = 0.69, center

Dilatation curves for ferrite

Conclusion Bainite, like martensite, shows stabilisation effects. The amount of bainite that can form at any temperature is reduced when austenite is deformed.