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Precipitation of carbides in low-carbon Fe-AI-C alloys

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Abstract

High-purity Fe-C alloys containing up to 5.8 pct Al were quenched from 730°C, then aged at temperatures up to 400°C. Precipitation of a carbide transition phase (presumably ε) and of cementite were followed by transmission electron microscopy, coercive force measurements, and changes in yield strength. The presence of aluminum increases the temperature at which cementite begins to precipitate during aging. This effect is similar to that produced by silicon in ferrite, and opposite to that produced by manganese. It is suggested that the effects of Si, Mn, and Al on cementite precipitation from ferrite arise from the effects of these elements on the stability of cementite, as reflected in the equilibrium partition of carbon between cementite and ferrite.

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Authors and Affiliations

  1. University of Michigan, 48109, Ann Arbor, MI

    W. C. Leslie (Professor of Materials Engineering)

  2. Magnetics Department, R & D Center, Westinghouse Electric Corporation, 15235, Pittsburgh, PA

    G. C. Rauch (Senior Engineer)

Authors
  1. W. C. Leslie
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  2. G. C. Rauch
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Leslie, W.C., Rauch, G.C. Precipitation of carbides in low-carbon Fe-AI-C alloys. Metall Trans A 9, 343–349 (1978). https://doi.org/10.1007/BF02646383

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  • DOI: https://doi.org/10.1007/BF02646383

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