Effect of Niobium (Nb) Content on Alloy 625 Weld Overlay

Reylina Garcia Tayactac; Mark Christian Manuel; Jaime Honra; Tiago Bohn Kaspary; Raimundo Cabral de Medeiros; Alexandre Bellegard Farina

doi:10.4028/p-To9oXi

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HomeMaterials Science ForumMaterials Science Forum Vol. 1110Effect of Niobium (Nb) Content on Alloy 625 Weld...

Effect of Niobium (Nb) Content on Alloy 625 Weld Overlay

Abstract:

Ni-based superalloys, including Alloy 625, are known for their high strength and excellent resistance to corrosion at high temperatures. Alloy 625 is widely used in geothermal, petrochemical, and power generation industries due to its exceptional performance in harsh environments. It is an austenitic alloy composed of Ni, Cr, Mo, and Nb, with high Cr content (~20 wt%) contributing to its superior corrosion resistance, and solid solution strengthening is attributed to the presence of other alloying elements such as Mo, Nb, and Fe. However, during welding with Alloy 625, Mo and Nb tend to segregate aggressively towards the liquid. This study will investigate the effect of reducing the level of Nb in commercial alloy 625 for weld overlay cladding on carbon-manganese steel. The CALPHAD method will be used to obtain the phase equilibria by thermodynamic simulations of compositions ranging from 0% to 100% dilution. This study is crucial to the weld overlay cladding sector as it aims to identify the best properties of CRA material suitable for highly corrosive environments.

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Periodical:

Materials Science Forum (Volume 1110)

Pages:

55-64

DOI:

https://doi.org/10.4028/p-To9oXi

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Online since:

December 2023

Authors:

Reylina Garcia Tayactac*, Mark Christian Manuel, Jaime Honra, Tiago Bohn Kaspary, Raimundo Cabral de Medeiros, Alexandre Bellegard Farina

Keywords:

Alloy 625, CALPHAD Methodology, Nb Content, Weld Overlay Cladding

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