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Structure and mechanical properties of unidirectionally solidified Fe-Cr-C and Fe-Cr-X-C alloys

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Abstract

In this work four different microstructures were obtained by unidirectional solidification of Fe-Cr-C eutectic alloys. Conditions for zone coupled growth were determined in alloys containing approximately 30 wt pct chromium. Furthermore, mechanical testing indicated that the maximum strength was exhibited by Fe-30Cr-C alloys with cerium or titanium additions. These alloys had the largest volume fraction of eutectic fibers and their ultimate tensile strength was of the order of 3250 MPa. Correlations between the rate of crystal growth(u) and fiber spacing (λ) or tensile strength(Rm) were found and an expression of the typeRm = Aλ-b2 was obtained whereb 2 varied between 0.283 and 0.685. Finally, manganese or chromium (35 wt pct Cr) additions did not lead to appreciable improvements in composite strength for this alloy system.

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Authors and Affiliations

  1. Academy of Mining and Metallurgy, Reymonte 23, Cracow, Poland

    Edward Fras (Professor) & Edward Guzik (Associate Professor)

  2. Department of Metallurgical Engineering, Saltillo Institute of Technology, Apartado 84-C, Saltillo, Coah., Mexico

    Hugo F. Lopez (Associate Professor)

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  1. Edward Fras
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  2. Edward Guzik
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  3. Hugo F. Lopez
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Fras, E., Guzik, E. & Lopez, H.F. Structure and mechanical properties of unidirectionally solidified Fe-Cr-C and Fe-Cr-X-C alloys. Metall Trans A 19, 1235–1241 (1988). https://doi.org/10.1007/BF02662584

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  • DOI: https://doi.org/10.1007/BF02662584

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