Why is certain non-metals such as Nitrogen, Phosphorous and Sulfur (in very small wt %) added to INCONEL-625 alloy?

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Robert Král

Hello,

Phosphorus in very small concentration can enhance the effect of Boron, as so-called "grain boundary strengthener". In case of Sulphur, I think it is rather an impurity, see the link

https://www.researchgate.net/publication/288613029_Sulphur_control_in_nickel-based_superalloy_production

Hopefully this will help you

Regards

Robert

Presentation Sulphur control in nickel-based superalloy production

Roshan Sebastian

Sir, In the alloy of interest INCONEL-625, there's no Boron element present , but there's Carbon added in amounts less than 0.10 wt %. Is Phosphorous enhancing the Carbide formation or Grain boundary segregation of Carbon?

Yes, I think that Phosphorus and Carbon, even without any Boron present, should also have a synergistic effect.