18%Cr-10%Ni 系オーステナイト鋼の高温における強度と組織におよぼす炭化物安定化元素(Ti, Nb および V)の影響

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The influences of titanium, niobium and vanadium on the creep rupture strength have been studied using 0.1%C-18%Cr-10%Ni stainless steels. The correlation of the strength to the microstructural change during creep has also been discussed. The highest value of 700℃-10^4 hr rupture strength in a titanium and niobium series (steels containing various amounts of titanium and niobium, respectively) is obtained at Ti/C and Nb/C atomic ratios of 0.8 and 0.2∿0.4, respectively. On the other hand, in a vanadium series, the creep rupture strength of the steel shows its maximum at V/C atomic ratio of about unity at test temperature of 700℃ and 800℃, but at 600℃, the strength increases monotonicaly with vanadium content up to 1.53%. The high strengths of the steels containing proper amounts of titanium, niobium, or vanadium can mainly be attributed to the fine distribution of M_<23>C_6 precipitates which is caused by the acceleration of nucleation due to the foregoing precipitation of an MC type carbide within austenite grains. It is deduced that the solid solution strengthening effect of vanadium contributes also to the remarkable increase in the rupture strength of the vanadium steel at 600℃.
社団法人日本鉄鋼協会の論文
1972-10-01