The Microstructure of Weld Overlay Ni-Base Alloy Deposited on Carbon Steel by CMT Method

Abstract:

Ni-base alloys, like Inconel 625, exhibit a high temperature corrosion and oxidation resistance. For this reason, these alloys are typically used as a one of the most important coating material and can be applied in a different environments and elements of devices having various applications. In this work, Inconel 625 was deposited onto a carbon steel P235GH by Cold Metal Transfer method. Due to the segregation of Ni, Cr, Nb and Mo elements the Inconel 625 weld overlays cladded on boiler pipes P235GH obtained the dendritic structure, with the formation of a second phases at the end of solidification. The presence of γ (with high dislocation density), the Laves and (Nb,Ti)C phases was revealed by means of TEM examinations. The multipoint EDS analysis confirmed the presence of low Fe concentration in the Inconel 625 alloy coatings. The concentration profiles of Ni, Cr, Mo and Nb performed across the dendritic structure showed segregation of these elements.

• Periodical: Solid State Phenomena (Volume 231)
• Pages: 119-124
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.231.119
• Online since: June 2015
• Authors: Monika Solecka*, Paweł Petrzak, Agnieszka Radziszewska
• Keywords: Cladding, EDS, Inconel 625, SEM, TEM

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