15Cr-14Ni 系耐熱鋼のクリープ特性におよぼす Ti と熱処理の効果

概要

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To determine the optimum titanium content and heat treatments for 15Cr-14Ni heat resisting steels, an investigation has been carried out on their effects on the creep properties. The effects of precipitates on creep properties have been discussed. The creep rupture and creep strengths are found to have a maximum at Ti/C ratio of 2.0-4.0. The creep rupture and creep strengths decrease with increasing solution temperature at Ti/C ratio of zero, have a maximum at the solution temperature of 1150℃ at Ti/C ratio of 0.1-1.0, and increase with increasing solution temperature at Ti/C ratio of 1.0-8.0. The creep rupture strength increases with increasing (%C)×(%Ti)×(n_1)^<1/2>×D_γ, where (%C)_<sol.> is dissolved carbon content, (%Ti)_<sol.> is dissolved titanium content, n_I is distribution density of undissolved carbide, and D_γ is grain diameter. This is interpreted by the combination of the following two factors; the solution strengthening of carbon and titanium and the dispersion strengthening of undissolved carbide and precipitated M_<23>C_6 and TiC.
社団法人日本鉄鋼協会の論文
1973-12-01