Influence of Nitrogen on the Low Temperature Brittleness of steel

The influence of nitrogen on the low temperature brittleness of steel has been investigated. In particular,it was systematically studied under the coexistence of other elements which have a chemical affinity for nitrogen . Among those studied, Ti, Al and V have a strong affinity , Si and P a moderate and Cu, Sn and As a weak affinity . All these alloy- ing elements were found first to diminish the effect of nitrogen by forming nitrides or reducing the solubility of nitrogen in a-iron, and then to reveal their own effect with increasing content