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On Phase Distribution and Phase Transformations in Phosphoric Irons Studied by Metallography

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Abstract

The microstructures of novel phosphoric irons have been studied by metallography in order to understand the phase distribution and phase transformations in the iron-rich end of the Fe-P phase diagram. Both Nital etchant and Oberhoffer’s reagent were effective in revealing dual-phase microstructures of phosphoric irons that were heat treated in the (α + γ) region. The phase distribution in dual-phase microstructures was analyzed by quantitative metallography and related to the phase diagram. The morphology of austenite depended on phosphorus content and heat-treatment temperature. The microsegregation of phosphorus and phosphorus diffusivity was studied as a function of the temperature and soaking time of the specimens. The beneficial effect of the heat treatment of phosphoric irons in the dual-phase region of the Fe-P phase diagram on mechanical behavior has been confirmed by tensile testing.

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Acknowledgment

The authors acknowledge the Field Gun Factory (Kanpur, India) for forging the phosphoric irons and completing the composition analysis.

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Authors and Affiliations

  1. Department of Materials and Metallurgical Engineering, Indian Institute of Technology, Kanpur, 208016, India

    Gadadhar Sahoo (Doctoral Student, Assistant Manager) & R. Balasubramaniam (Professor)

  2. R&D Center for Iron and Steel, Steel Authority of India Limited, Ranchi, 834002, India

    Gadadhar Sahoo (Doctoral Student, Assistant Manager)

Authors
  1. Gadadhar Sahoo
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  2. R. Balasubramaniam
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Correspondence to R. Balasubramaniam.

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Manuscript submitted August 10, 2006.

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Sahoo, G., Balasubramaniam, R. On Phase Distribution and Phase Transformations in Phosphoric Irons Studied by Metallography. Metall Mater Trans A 38, 1692–1697 (2007). https://doi.org/10.1007/s11661-007-9227-1

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  • DOI: https://doi.org/10.1007/s11661-007-9227-1

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