316LNステンレス鋼の機械的特性に及ぼす窒素(N)の影響(力学特性)

概要

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Type 316LN stainless steel is one of the candidate structural materials for the low stress regions of the toroidal field coil for International Thermonuclear Experimental Reactor (ITER). It was confirmed that contribution of nitrogen to 0.2% yield strength of 316LN at 4K is more than that of carbon in a previous paper. However, it has never be investigated the tensile property of the 316LN, in which carbon content was controlled at low level and nitrogen content was varied. Therefore, it was systematically investigated the mechanical properties of the low carbon controlled 316LN, in which nitrogen content was varied in the wide range, at 4K, 77K, room temperature and high forging temperatures. In consequence, it was confirmed that the cryogenic elongation of the specimens included the high nitrogen content over 0.221 mass% was lower than an elongation-(T-M_<d30>) curve. T means tensile test temperature. In addition, the data of the reduction of area at 1373K were increased with increasing nitrogen content over 0.175 mass%. It was inferred that these behaviors were influenced by enhancement of dislocation density by super saturation of solution nitrogen.
社団法人日本鉄鋼協会の論文
2006-02-01