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Understanding the Mechanisms of Bainite Transformation in TRIP-assisted Steels

This research delves into the displacive transformation mechanism of bainite in TRIP-assisted steels, such as Fe-0.29C-1.41Si-1.42Mn, highlighting the critical roles of temperature and carbon diffusion. The study reveals that while bainite grows without diffusion, carbon escapes into the residual austenite, prompting a complex interplay between initial transformation and carbon partitioning. The findings underscore the importance of accommodating shape deformations during growth and clarify the relationships between different transformation phases, including the influence of strain energy on the process.

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Understanding the Mechanisms of Bainite Transformation in TRIP-assisted Steels

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  1. http://cml.postech.ac.kr/

  2. 1 µm

  3. Surface 1 Surface 2 50 µm Srinivasan & Wayman, 1968

  4. s d c r 1

  5. 50 µm

  6. Bhadeshia and Waugh, 1981

  7. Takahashi and Bhadeshia

  8. 2 1 0 300 400 500 Fe-0.4C wt% Decarburisation time / s Temperature / °C

  9. Temperature Ae3' T' o x Carbon in austenite

  10. TRIP-assisted steel Fe-0.29C-1.41Si-1.42Mn wt% (Jacques, 2001)

  11. Growth is diffusionless. Strain energy must be accounted for.

  12. Takahashi and Bhadeshia

  13. Oka and Okamoto

  14. Ohmori and Honeycombe

  15. Summary The mechanism of transformation is displacive. Transformation temperature higher than martensite. Bainite grows without diffusion. But carbon then escapes into the residual austenite. Shape deformation plastically accommodated. Sub-unit mechanism of growth

  16. Think of bainite as martensite which tempers during transformation

  17. DISPLACIVE RECONSTRUCTIVE

  18. Summary Mechanism of transformation is displacive but carbon must partition during growth. Pairs of plates grow together to minimise strain.

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