12% Cr 耐熱鋼の長時間クリープ破断強度におよぼす B の影響

概要

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The effect of boron on creep rupture properties of steels has been investigated in order to develop new 12% Cr heat resisting steel with improved strength at elevated temperatures. 1) The creep rupture strength of a 12% Cr-Mo-V-Nb steel is improved by boron addition. Especially, the creep rupture life of the steel containing 0.037% boron is five to six times as long as that of the steel free from boron in long term creep rupture tests at 650℃ and above. 2) Boron forms boro-carbide M_<23>(C, B)_6, substituting some amounts of carbon in carbide, type M_<23>C_6. It is observed under electron microscope that M_<23>(C, B)_6 is finer than M_<23>C_6 at elevated temperature. This is one of the reason for that the 12% Cr-Mo-V-Nb-B steel has superior creep rupture strength to the 12% Cr-Mo-V-Nb steel.
社団法人日本鉄鋼協会の論文
1975-07-01