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Phase characterization in as-cast F-75 Co–Cr–Mo–C alloy

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Abstract

Microstructural characterization of a cast acetabulum of ASTM F-75 alloy has been carried out in order to clarify conflicting reports from the literature. The present investigation revealed that although sigma (σ) and M23C6 carbide were the only secondary phases formed in the face centered cubic cobalt-base alpha matrix (Co-α), as identified by X-ray diffraction, the observed microstructure was quite complex. Scanning and transmission electron microscopy indicated the presence of coarse and fine lamellar cellular colonies, grain boundary film carbide, and different types of coarse blocky particles, including single-phase σ, dual-phase σ/M23C6, a binary eutectic comprised of σ and Co-α phases, and a three-phase feature comprising the binary eutectic and solid state formed M23C6. The carbide has probably formed during cooling from casting due to σ metastability. While it is proposed that the some lamellar cellular colonies were formed by discontinuous precipitation, it is not clear whether all lamellar structures present in the as-cast alloy occurred due to the same mechanism. The results obtained for the tensile properties are discussed in view of the observed microstructure.

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Acknowledgements

R. Rosenthal wishes to acknowledge a grant received from the National Research Council (CNPq) of Brazil.

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Authors and Affiliations

  1. Universidade Estadual do Norte Fluminense Darci Ribeiro, Advanced Materials Laboratory, Campos dos Goytacazes, 28013-602, Brazil

    R. Rosenthal, R. P. R. Paranhos & E. A. Carvalho

  2. Centro de Pesquisas de Energia Elétrica, Rio de Janeiro, 21941-911, Brazil

    B. R. Cardoso

  3. Department of Metallurgy and Materials Science, Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, 22453-900, Brazil

    I. S. Bott

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  1. R. Rosenthal
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  2. B. R. Cardoso
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  3. I. S. Bott
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  4. R. P. R. Paranhos
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  5. E. A. Carvalho
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Correspondence to R. Rosenthal.

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Rosenthal, R., Cardoso, B.R., Bott, I.S. et al. Phase characterization in as-cast F-75 Co–Cr–Mo–C alloy. J Mater Sci 45, 4021–4028 (2010). https://doi.org/10.1007/s10853-010-4480-x

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  • DOI: https://doi.org/10.1007/s10853-010-4480-x

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