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Jimy Unfried-Silgado,Antonio J. Ramirez 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.2
This work aims the numerical modeling and characterization of as-welded microstructure of Ni-Cr-Fe alloyswith additions of Nb, Mo and Hf as a key to understand their proven resistance to ductility-dip cracking. Part Ideals 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 acooling rate of 100 K.s−1, considering their consequences on solidification mode for each alloy. Calculatedstructures 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 packedphases (TCP), a homogeneously intradendritic distribution, and a slight increase of interdendritic Molybdenumdistribution in these alloys. Incidences of metallurgical characteristics of modeled as-welded structures ondesirable characteristics of Ni-based alloys resistant to DDC are discussed here.