15Cr-14Ni 系耐熱鋼のクリープ特性におよぼす Mo と熱処理の影響

概要

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The effects of molybdenum and heat treatments on the creep properties and micro-structures of 0.15C-15Cr-14Ni heat resisting steels have been studied. The relationships between creep properties and several structural factors and discussed. The results are as follows : The creep rupture strength and creep strength increase with the molybdenum content. Below 1% molybdenum, the creep rupture strength decreases with increasing solution temperature, but over this content it has a maximum at the solution temperature of 1150℃. It is found that the increment of the creep rupture strength due to molybdenum addition is proportional to the product of {(%C)_<sol>}^<0.5>×{(%Mo)_<sol>}^<0.5>×(n_I)^<0.5>×(D_r)^<0.5>, where (%C)_<sol> and (%Mo)_<sol> are the contents of carbon and molybdenum in austenite matrix, respectively ; n_I is the distribution density of undissolved carbides and D_r is the mean austenite grain diameter after solution treatment. This is explained by the combination of the following factors ; the solid-solution hardening by carbon and molybdenum, the dispersion strengthening by undissolved and precipitated carbides, and the effect of the grain size. Massive, cubic and ribbon-like M_<23>C_6 and rod-like M_6C were observed in the creep ruptured specimens of these steels.
社団法人日本鉄鋼協会の論文
1975-10-01