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51315-5756-Metallurgy and Corrosion Resistance of UNS N06686 Weld Metal

Picture for Metallurgy and Corrosion Resistance of UNS N06686 Weld Metal
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Product Number: 51315-5756-SG
ISBN: 5756 2015 CP
Author: Jeremy L. Caron
Publication Date: 2015
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HASTELLOY® C-86 alloy (UNS N06686) is a Ni-base corrosion-resistant alloy containing relatively high concentrations of Cr Mo and W. Higher levels of these elements generally lead to better resistance to both general and localized corrosion when referring to wrought microstructures in the proper annealed condition. However due to elemental segregation during weld solidification there is a wide variation in the local chemical composition of as-solidified weld metal. Components fabricated from Ni-base alloys are typically employed in the as-welded condition and the as-solidified weld metal is often the microstructural region most susceptible to corrosive attack. With this in mind the purpose of this work was to gain a greater understanding of the effects of elemental segregation in as-welded N06686 alloy in particular the influence of composition within its UNS composition range (also specified as ERNiCrMo-14 in AWS A5.14). The weld metal microstructures were characterized and tensile properties in the as-welded condition were determined. In addition all-weld-metal samples were tested in various aqueous corrosion environments. The corrosion test results showed that higher levels of Cr Mo and W within the UNS range do not lead to enhanced corrosion resistance in certain corrosive environments. These findings were correlated to the welding metallurgy which was established from experimental results and Scheil solidification calculations. The results suggest that higher alloying additions within the UNS N06686 composition range can be counterproductive to the corrosion resistance of its weld metal.
HASTELLOY® C-86 alloy (UNS N06686) is a Ni-base corrosion-resistant alloy containing relatively high concentrations of Cr Mo and W. Higher levels of these elements generally lead to better resistance to both general and localized corrosion when referring to wrought microstructures in the proper annealed condition. However due to elemental segregation during weld solidification there is a wide variation in the local chemical composition of as-solidified weld metal. Components fabricated from Ni-base alloys are typically employed in the as-welded condition and the as-solidified weld metal is often the microstructural region most susceptible to corrosive attack. With this in mind the purpose of this work was to gain a greater understanding of the effects of elemental segregation in as-welded N06686 alloy in particular the influence of composition within its UNS composition range (also specified as ERNiCrMo-14 in AWS A5.14). The weld metal microstructures were characterized and tensile properties in the as-welded condition were determined. In addition all-weld-metal samples were tested in various aqueous corrosion environments. The corrosion test results showed that higher levels of Cr Mo and W within the UNS range do not lead to enhanced corrosion resistance in certain corrosive environments. These findings were correlated to the welding metallurgy which was established from experimental results and Scheil solidification calculations. The results suggest that higher alloying additions within the UNS N06686 composition range can be counterproductive to the corrosion resistance of its weld metal.
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