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Rapid Solidification Behavior of Fe-Cr-Mn-Mo-Si-C Alloys

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Abstract

The rapid solidification behavior of alloys in the Fe-Cr-Mn-Mo-Si-C system was investigated for different compositions and cooling rates. The C content was varied and alloying additions of Mo and B were studied with respect to their effect on the microstructure. The alloys were cast as either melt-spun ribbons or as 1-mm-thick plates after levitation or as rods 2 to 4 mm in diameter by injection into copper molds. A homogeneous single-phase structure was obtained for the alloy of composition 72.8Fe-8Cr-6Mn-5Si-5Mo-3.2C (wt pct), for a sample diameter of 2.85 mm, at a cooling rate of ≈1100 K/s. The single-phase structure was identified as a metastable solid solution, exhibiting the characteristics of the ε phase. Upon reheating, decomposition of the single-phase structure into fine bainite plates and secondary carbides was observed between 600 °C and 700 °C. The annealed structure obtained showed high hardness values (>850 HV).

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Acknowledgment

The authors thank Mr. Hans Bergquist for assistance with the TEM analyses.

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Authors and Affiliations

  1. Materials Processing, Royal Institute of Technology, SE-100 44, Stockholm, Sweden

    Sathees Ranganathan (Doctoral Student), Advenit Makaya (Researcher), Hasse Fredriksson (Professor) & Steven Savage (Associate Professor)

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  1. Sathees Ranganathan
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  2. Advenit Makaya
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  3. Hasse Fredriksson
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  4. Steven Savage
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Correspondence to Sathees Ranganathan.

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Manuscript submitted March 15, 2006.

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Ranganathan, S., Makaya, A., Fredriksson, H. et al. Rapid Solidification Behavior of Fe-Cr-Mn-Mo-Si-C Alloys. Metall Mater Trans B 38, 917–926 (2007). https://doi.org/10.1007/s11663-007-9108-4

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