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Stabilization mechanisms of retained austenite in transformation-induced plasticity steel

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Abstract

Three stabilization mechanisms—the shortage of nuclei, the partitioning of alloying elements, and the fine grain size—of the remaining metastable austenite in transformation-induced plasticity (TRIP) steels have been studied by choosing a model alloy Fe-0.2C-1.5Mn-1.5Si. An examination of the nucleus density required for an athermal nucleation mechanism indicates that such a mechanism needs a nucleus density as large as 2.5 · 1017 m−3 when the dispersed austenite grain size is down to 1 µm. Whether the random nucleation on various heterogeneities is likely to dominate the reaction kinetics depends on the heterogeneous embryo density. Chemical stabilization due to the enrichment of carbon in the retained austenite is the most important operational mechanism for the austenite retention. Based on the analysis of 57 engineering steels and some systematic experimental results, an exponential equation describing the influence of carbon concentration on the martensite start (M s) temperature has been determined to be M s (K)=273+545.8 · e −1.362w c(mass pct). A function describing the M s temperature and the energy change of the system has been found, which has been used to study the influence of the grain size on the M s temperature. The decrease in the grain size of the dispersed residual austenite gives rise to a significant decrease in the M s temperature when the grain size is as small as 0.1 µm. It is concluded that the influence of the grain size of the retained austenite can become an important factor in decreasing the M s temperature with respect to the TRIP steels.

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Author notes

  1. Jiajun Wang (Researcher and Metallurgist)

    Present address: the Netherlands Institute for Metals Research, Rotterdamseweg 137, 2628 AL, Delft

Authors and Affiliations

  1. Philips Lighting B.V., 6026RX, Maarheeze, The Netherlands

    Jiajun Wang (Researcher and Metallurgist)

  2. the Department of Materials Science, Delft University of Technology, Rotterdamseweg 137, 2628 AL, Delft, The Netherlands

    Sybrand Van Der Zwaag (Professor)

Authors
  1. Jiajun Wang
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  2. Sybrand Van Der Zwaag
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Wang, J., Van Der Zwaag, S. Stabilization mechanisms of retained austenite in transformation-induced plasticity steel. Metall Mater Trans A 32, 1527–1539 (2001). https://doi.org/10.1007/s11661-001-0240-5

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  • DOI: https://doi.org/10.1007/s11661-001-0240-5

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