Effect of Nitrogen and Other Alloying Elements on the Low-Temperature Brittleness of Steel. I : Correlation of Nitrogen and Carbon

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U-notch Charpy tests were performed with steels containing 0.3 to 0.4% of manganese, 0.15 to 0.25% of silicon, 0.003 to 0.005% of phosphorus. 0.015 to 0.030% of sulphur, 0.003 to 0.019% of nitrogen, 0.03 to 0.82% of carbon and copper in order to clarify the effect of nitrogen and carbon on the low-temperature brittleness of carbon steel. The results obtained were as follows. 1. The transition temperature rises with increasing content of nitrogen and carbon. 2. The effect of nitrogen becomes greater with lowering grade of carbon steel. 3. The transition temperature rises sharp up to about 0.008% nitrogen content, beyond which it rises gradually. 4. The effect of nitrogen is observable in low-carbon α-Fe, but less in hypoeutectoid structure, and not in eutectoid structure.
東北大学の論文