DUPLEX STAINLESS STEEL AND ALLOYING OF STEEL BY NITROGEN
Nitrogen in steel effect in improving the mechanical and corrosion properties of steel if it remains in solid solution when we make precipitate. Addition of nitrogen improve fatigue life, strength. It fights localized corrosion (pitting, crevice, and intergranular corrosion). Due to this feature and behaviour of nitrogen in steel is good class engineering material. Nitrogen is strong austenitic former, it takes the interstitial position between the steel. It diffuses fast and alloying require less time. There is rapid oxide formation during welding and AM. Nitrogen also helps to increase pitting resistance. Various effect of Nitrogen, we have to give desired % of nitrogen to prevent the resultant material from inconsistent/ irregular mechanical properties. Embrittlement of heat affected zone of welded steel also tends to the poor formability of material. Nitrogen result in strain ageing and reduce ductility. Hardness of steel linearly Increases with %N. More effective when added during steel making.
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