Strain-induced Stabilisation of Austenite Against Bainite Transformation

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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
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Fe - 0.12 C - 2.0 Si - 3.0 Mn (wt)

• High hardenability
• Si to suppress carbide precipitation

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Dilatation curves for bainite
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500 oC, e 0
475 oC, e 0
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Inhomogeneous nature of deformation (barrelling)
leads to non-uniform microstructure along the
compression axis.
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500 oC, e 0.18, edge
500 oC, e 0.18, center
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500 oC, e 0.69, center
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475 oC, e 0.18, edge
475 oC, e 0.18, center
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475 oC, e 0.36, edge
475 oC, e 0.36, center
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475 oC, e 0.69, edge
475 oC, e 0.69, center
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Dilatation curves for ferrite
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Conclusion

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