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A new Bcc-Fcc orientation relationship observed between ferrite and austenite in solidification structures of steels

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Abstract

A new crystallographic orientation relationship (OR) between delta-ferrite and austenite has been observed in solidification microstructures of 304L and 309S austenitic stainless steels and a ternary Fe-Cr-Ni alloy. Evidence for the new OR was obtained from electron diffraction patterns in transmission electron microscopy (TEM). This relationship, (111)fcc//(110)bcc and \([\bar 110]_{fcc} //[\bar 110]_{bcc} \), has not been previously reported for bcc-fcc systems. The 〈110〉fcc//#x2329;110〉bcc alignment is distinctive among known bcc-fcc ORs. The new OR is related to the Kurdjumov-Sachs (K-S) and Nishiyama-Wassermann (N-W) ORs by relative rotations of 35.26 and 30 deg, respectively, about the normal to the parallel close-packed planes. In 304L fabricated by laser-engineered net shaping (LENS), delta-ferrite with the new OR was found to coexist in the microstructure with both K-S and N-W oriented ferrite, but in separate austenite grains and with less frequent occurrence. In gas-tungsten arc (GTA) welds of 309S and the Fe-Cr-Ni alloy, the new OR was the only one observed within a few grains, whereas ferrite within other grains did not establish an apparent OR with the austenite matrix.

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Authors and Affiliations

  1. the Materials Characterization Department, Sandia National Laboratories, NM 87185-1411, Albuquerque

    T. J. Headley (Distinguished Member of Technical Staff)

  2. the Engineered Materials Department, Sandia National Laboratories, 94551-9402, Livermore, CA

    J. A. Brooks (Principal Member of Technical Staff)

Authors
  1. T. J. Headley
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  2. J. A. Brooks
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Headley, T.J., Brooks, J.A. A new Bcc-Fcc orientation relationship observed between ferrite and austenite in solidification structures of steels. Metall Mater Trans A 33, 5–15 (2002). https://doi.org/10.1007/s11661-002-0001-0

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  • DOI: https://doi.org/10.1007/s11661-002-0001-0

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