V, Nb, B を含む 12%Cr 耐熱鋼の長時間クリープ破断強度におよぼす Mo, W の影響

概要

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It is known that 12%Cr heat resisting steel is one of the most economical heat resisting steels. It is, however, inferior to austenitic heat resisting steels in the creep rupture strength above 600℃. So, the effects of Mo and W were investigated in order to improve the creep rupture strength of 12%Cr heat resisting steel containing V, Nb, and B. (1) The creep rupture strength of 12%Cr heat resisting steel is increased by the additions of Mo and W. Additions of Mo and W result in solid solution strengthening as well as precipitation hardening. (2) In the case of a single addition, optimum amount of Mo is about 1.5% and that of W is about 3.0%. Whereas in the case of a combined addition, optimum amounts of M and W are both about 1.0%. (3) It is observed in an electron microscope that coalescence of precipitated carbide perticles are retarded by the additions of Mo and W to the steel.
社団法人日本鉄鋼協会の論文
1975-03-01