A systematic study of the effect of nitrogen contents from 33 to 210 ppm on the microstructure and mechanical properties of submerged arc deposits has indicated that the optimum toughness occurs when the nitrogen content is about 70 ppm. The fracture appearance transition temperature was lower at the highest and lowest nitrogen levels. Changes in the microstructure and mechanical properties of the deposit were satisfactorily interpreted with the aid of a model in which the reaction sequence was Ti with O2 then Ti with N2, and then B with N2.
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