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Superplasticity in Rapidly Solidified White Cast Irons

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Abstract

Superplastic properties of three different composition white cast irons were investigated in the temperature range of 630 to 725 °C. Fine structures consisting of 1 to 2 μm ferrite grains were developed in these materials by consolidation of rapidly solidified powders at intermediate temperatures below the A1 critical temperature. Tensile elongations of 1410 pct were found for a 3.0 pct C + 1.5 pct Cr white cast iron, 940 pct for a 3.0 pct C white cast iron, and 480 pct for a 2.4 pct C white cast iron when tested at 700 °C and at a strain rate of 1 pct per minute. The superplastic white cast irons exhibited a high strain rate sensitivity exponent,m, of 0.5 and activation energies for plastic flow were found to be nearly equal to the activation energy for grain boundary self-diffusion in iron. These observations are in agreement with the creep behavior of superplastic materials controlled by grain boundary diffusion.

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Authors and Affiliations

  1. CENIM, Av. de Gregorio del Amo s/n, Madrid (3), Spain

    Oscar A. Ruano (Research Scientist)

  2. SRI International, 94025, Menlo Park, CA

    Lawrence E. Eiselstein (Materials Scientist)

  3. Materials Science and Engineering, Stanford University, 94305, Stanford, CA

    Oleg D. Sherby (Professor)

Authors
  1. Oscar A. Ruano
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  2. Lawrence E. Eiselstein
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  3. Oleg D. Sherby
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Additional information

OSCAR A. RUANO, formerly with the Department of Materials Science and Engineering, Stanford University.

LAWRENCE E. EISELSTEIN, formerly with the Department of Materials Science and Engineering, Stanford University.

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Ruano, O.A., Eiselstein, L.E. & Sherby, O.D. Superplasticity in Rapidly Solidified White Cast Irons. Metall Trans A 13, 1785–1792 (1982). https://doi.org/10.1007/BF02647834

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  • DOI: https://doi.org/10.1007/BF02647834

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