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The influence of starting microstructure on the retention and mechanical stability of austenite in an intercritically annealed-low alloy dual-phase steel

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Abstract

Retention of austenite during the intercritical annealing of a low carbon, low-alloy, dual-phase steel and the mechanical stability of retained austenite(γ R) have been studied as a function of starting microstructure and annealing conditions. A quenched and tempered(QT) starting microstructure has been found to result in higher γR volume fractions compared to fully martensitic(Q) and ferrite plus pearlitic(F + P) starting structures for all annealing conditions employed in this work. The austenite formed by annealing up to 792 °C (where the kinetics are dominated by higher nucleation rates) is more prone to retention compared to that formed by annealing beyond 792 °C (where the kinetics are mainly dominated by higher growth rates). A smaller size of γR particles has a better mechanical stability against deformation-induced martensite transformation.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Manitoba, Winnipeg, MB, Canada

    N. C. Goel (Research Associate) & K. Tangri (Professor and Head of Metallurgical Sciences Laboratory)

  2. Metallurgy Department, The Ohio State University, Columbus, OH

    J. P. Chakravarty Ph.D. Student

Authors
  1. N. C. Goel
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  2. J. P. Chakravarty Ph.D. Student
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  3. K. Tangri
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Formerly Master's Student at the University of Manitoba

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Goel, N.C., Chakravarty, J.P. & Tangri, K. The influence of starting microstructure on the retention and mechanical stability of austenite in an intercritically annealed-low alloy dual-phase steel. Metall Trans A 18, 5–9 (1987). https://doi.org/10.1007/BF02646215

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  • DOI: https://doi.org/10.1007/BF02646215

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