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Precipitation of an intermetallic phase with Pt2Mo-type structure in alloy 625

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Abstract

The microstructure of Alloy 625, which has undergone prolonged (∼70,000 hours) service at temperatures close to but less than 600 °C, has been characterized by transmission electron microscopy. The precipitation of an intermetallic phase Ni2(Cr, Mo) with Pt2Mo-type structure has been observed in addition to that of the γ″ phase. Six variants of Ni2(Cr, Mo) precipitates have been found to occur in the austenite grains. These particles exhibit a snowflake-like morphology and are uniformly distributed in the matrix. They have been found to dissolve when the alloy is subjected to short heat treatments at 700 °C. The occurrence of the Ni2(Cr, Mo) phase has been discussed by taking the alloy chemistry into consideration. Apart from the intermetallic phases, the precipitation of a M6C-type carbide phase within the matrix and the formation of near continuous films, comprising discrete M6C/M23C6 carbide particles, at the austenite grain boundaries have been noticed in the alloy after prolonged service.

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Authors and Affiliations

  1. the Materials Science Division, Bhabha Atomic Research Centre, 400 085, Mumbai, India

    M. Sundararaman (Scientific Officer), Lalit Kumar (Scientific Officer), G. Eswara Prasad (Head, Materials Characterisation Section), P. Mukhopadhyay (Head, Physical Metallurgy Section) & S. Banerjee (Head, Materials Science Division, and Associate Director, Materials Group)

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  1. M. Sundararaman
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  2. Lalit Kumar
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  3. G. Eswara Prasad
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  4. P. Mukhopadhyay
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  5. S. Banerjee
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Sundararaman, M., Kumar, L., Prasad, G.E. et al. Precipitation of an intermetallic phase with Pt2Mo-type structure in alloy 625. Metall Mater Trans A 30, 41–52 (1999). https://doi.org/10.1007/s11661-999-0194-6

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  • DOI: https://doi.org/10.1007/s11661-999-0194-6

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