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Effects of alloying elements upon austenite decomposition in Low-C steels

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Abstract

The kinetics of austenite decomposition were studied in high-purity Fe-0.1C-0.4Mn-0.3Si-X (concentrations in weight percent;X represents 3Ni, 1Cr, or 0.5Mo) steels at temperatures between 500 °C and 675 °C. The transformation stasis phenomenon was found in the Fe-C-Mn-Si-Mo and Fe-C-Mn-Si-Ni alloys isothermally transformed at 650 °C and 675 °C but not in the Fe-C-Mn-Si and Fe-C-Mn-Si-Cr alloys at any of the temperatures investigated. The occurrence of transformation stasis was explained by synergistic interactions among alloying elements. The paraequilibrium model was applied to calculate the metastable fraction of ferrite in each alloy. This fraction was shown to coincide with cessation of transformation in the Mo alloy transformed at 600 °C. Transformation stasis was found in both the Ni and the Mo alloys isothermally reacted at 650 °C and 675 °C. The interactions among Mn, Si, and Mo, as well as interactions among Mn, Si, and Ni, appear to decrease the threshold concentrations for transformation stasis in Fe-C-Mn-Si systems. Segregation of Mn and Mo to the α/yγ boundary, assisted by the presence of Si, was suggested to enhance the solute draglike effect (SDLE) and lead to transformation stasis. In the Ni alloy, a lower driving force for ferrite formation resulting from the Ni addition could be responsible for the occurrence of transformation stasis.

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Authors and Affiliations

  1. Materials Science and Engineering Department, Virginia Polytechnic Institute and State University, 24061-0237, Blacksburg, VA

    J. K. Chen (Graduate Student) & W. T. Reynolds (Associate Professor)

  2. Physical Metallurgy Branch, Naval Research Laboratory, 20375-5000, Washington, DC

    R. A. Vandermeer (Branch Consultant)

Authors
  1. J. K. Chen
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  2. R. A. Vandermeer
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  3. W. T. Reynolds
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Chen, J.K., Vandermeer, R.A. & Reynolds, W.T. Effects of alloying elements upon austenite decomposition in Low-C steels. Metall Mater Trans A 25, 1367–1379 (1994). https://doi.org/10.1007/BF02665470

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  • DOI: https://doi.org/10.1007/BF02665470

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