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Effect of nitrogen concentration on nano-structure and high-temperature strength of 9Cr-ODS steel

9Cr-ODS鋼のナノ組織と高温強度に対する窒素の影響

岡 弘 ; 丹野 敬嗣; 大塚 智史; 矢野 康英; 皆藤 威二

Oka, Hiroshi; Tanno, Takashi; Otsuka, Satoshi; Yano, Yasuhide; Kaito, Takeji

In determining the nitrogen concentration specifications, nano-structure and high-temperature strength of 9Cr-ODS steel have been investigated as a function of the nitrogen content with the aim of obtaining technical knowledge that makes the specification reasonable. The hardness and tensile strength showed degradation with increasing nitrogen content. For a microstructure, the decrement of residual ferrite phase was confirmed. Since the nitrogen is an austenite stabilizer, the increment of nitrogen enhanced an alpha to $$gamma$$ transformation, resulted in the decrease of the residual ferrite phase. It is considered that the reduction of the strength is due to the decrease of the residual ferrite phase.

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