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Modeling and characterization of as-welded microstructure of solid solution strengthened Ni-Cr-Fe alloys resistant to ductility-dip cracking part I: Numerical modeling

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Abstract

This work aims the numerical modeling and characterization of as-welded microstructure of Ni-Cr-Fe alloys with additions of Nb, Mo and Hf as a key to understand their proven resistance to ductility-dip cracking. Part I deals with as-welded structure modeling, using experimental alloying ranges and Calphad methodology. Model calculates kinetic phase transformations and partitioning of elements during weld solidification using a cooling rate of 100 K.s−1, considering their consequences on solidification mode for each alloy. Calculated structures were compared with experimental observations on as-welded structures, exhibiting good agreement. Numerical calculations estimate an increase by three times of mass fraction of primary carbides precipitation, a substantial reduction of mass fraction of M23C6 precipitates and topologically closed packed phases (TCP), a homogeneously intradendritic distribution, and a slight increase of interdendritic Molybdenum distribution in these alloys. Incidences of metallurgical characteristics of modeled as-welded structures on desirable characteristics of Ni-based alloys resistant to DDC are discussed here.

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Authors and Affiliations

  1. Metals characterization and processing laboratory, Brazilian Nanotechnology National Laboratory, CNPEM/ABTLuS., Campinas, Brazil

    Jimy Unfried-Silgado & Antonio J. Ramirez

  2. Faculdade de Engenharia Mecânica — FEM, Universidade Estadual de Campinas — UNICAMP, Campinas, Brazil

    Jimy Unfried-Silgado

  3. Programa de ingeniería mecánica. Grupo IMTEF, Universidad Autónoma del Caribe, Barranquilla, Colombia

    Jimy Unfried-Silgado

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  1. Jimy Unfried-Silgado
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  2. Antonio J. Ramirez
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Correspondence to Jimy Unfried-Silgado.

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Unfried-Silgado, J., Ramirez, A.J. Modeling and characterization of as-welded microstructure of solid solution strengthened Ni-Cr-Fe alloys resistant to ductility-dip cracking part I: Numerical modeling. Met. Mater. Int. 20, 297–305 (2014). https://doi.org/10.1007/s12540-014-1023-z

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  • DOI: https://doi.org/10.1007/s12540-014-1023-z

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