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Experimental Determination of Phase Equilibria in Fe-Cr-Ni-Al System

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Abstract

Alloys Fe-18Cr-9Ni-3Al, Fe-16Cr-18Ni-5Al, and Fe-20Cr-20Ni-5Al wt.% were prepared by vacuum arc melting and heat treated at 600 °C/514 days, 800 °C/56 days, 1000 °C/32 days, and 1100 °C/15 days. The microstructures of the samples were characterized to identify the equilibrium phases at each temperature. The compositions of the phases were measured with SEM-EDS. Solidus and liquidus were determined using DSC. The experimental results were compared with equilibrium thermodynamic calculations. Significant differences were observed for solidus, solvus temperatures, and compositions of the equilibrium phases.

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Acknowledgment

The authors are grateful to Dr Manas Paliwal of Sandvik Materials Technology, India, for his support in DSC measurements.

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Authors and Affiliations

  1. Sandvik Materials Technology, Old Mumbai Pune Road, Dapodi, Pune, 411 012, India

    Rohit Ojha

  2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600 036, India

    Rohit Ojha & K. C. Hari Kumar

  3. Kanthal AB, 734 27, Hallstahammar, Sweden

    Thomas Helander

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Ojha, R., Helander, T. & Kumar, K.C.H. Experimental Determination of Phase Equilibria in Fe-Cr-Ni-Al System. J. Phase Equilib. Diffus. 42, 428–438 (2021). https://doi.org/10.1007/s11669-021-00896-8

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