15Cr-14Ni 系耐熱鋼のクリープ特性におよぼす Nb と熱処理の影響

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The effects of niobium and heat treatments on the creep and creep-rupture properties of 15Cr-14Ni heat resisting steels and the electron-microscopic observation have been studied. The relationships between creep properties and several structural factors are discussed. The results are as follows ; In vacuum-melted 15Cr-14Ni steels, the addition of niobium improves the creep and creep-repture strengths but reduces the rupture ductility. In 0.15C-15Cr-14Ni steels containing niobium, the creep and creep-rupture strengths have maxima at some niobium contents, which increase with increasing the solution temperature. At higher niobium contents, the creep and creep-rupture strengths increase with increasing the niobium content. A decrease of the niobium content or an increase of the solution temperature gives a loss of the rupture ducility in these steels. We find that the increment of the creep rupture strength is proportional to the product of {(%C)_<sol>}^<0.4>×<(%Nb)_<sol>>^<0.4>×(n_I)^<0.2>×(D_γ)^<0.4>, where (%C)_<sol> and (%Nb)_<sol> are the contents of carbon and niobium in solution, respectively, (n_1) is the distribution density of undissolved carbides and (D_γ) is the mean austenite grain diameter after solution treatment. This is explained by the combination of the following factors ; the solid-solution hardening effects by carbon and niobium, the dispersion strengthening effects by carbides, M_<23>C_6 and NbC, and the effect of the grain size.
社団法人日本鉄鋼協会の論文
1974-04-01

15Cr-14Ni 系耐熱鋼のクリープ特性におよぼす Nb と熱処理の影響

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