オーステナイト系ステンレス鋼の酸化物の分散を利用した結晶粒径調整

概要

論文の詳細を見る
The difference in the deoxidation condition between Al-Ca system and Si-Mn system was discussed in terms of grain growth behavior of an austenitic stainless steel (Fe-17%Cr-9%Ni-3%Cu-low C, N alloy). In the steel deoxidized by Si-Mn, oxide inclusion exists as MnO-SiO_2 particles in the as-cast ingot. However, once this steel is annealed at 1523K for 3.6ks, a part of MnO-SiO_2 particles decomposes and MnO-Cr_2O_3 particles are newly formed on the annealing. The particle size ofMnO-Cr_2O_3 is about 0.2 fim span and this size is much smaller than that of MnO-SiO_2 particles (about 1 μm). This oxide transition from MnO-SiO_2 to MnO-Cr_2O_3 is very useful for suppressing the grain growth ofrecrystallized austenite grains on annealing at 1373K after 65% cold working because the reprecipitated fine oxide particles pin the austenite grain boundary effectively. The relation between austenite grain size and oxide particles dispersion is not explained by the well-known Zener's relationship but done by the Doherty's theory in which a half of particles are thought on grain boundary and play a role to pin the grain boundary. On the other hand, in the steel deoxidized by Al-Ca, stable Al_2O_3-CaO particles are formed in the as-cast ingot. This oxide is so stable that it never causes the oxide transition on annealing like that in the steel deoxidized by Si-Mn. Therefore, the grain refining through recrystallization process is never expected in the steel deoxidized by Al-Ca.
社団法人日本鉄鋼協会の論文

オーステナイト系ステンレス鋼の酸化物の分散を利用した結晶粒径調整

スポンサーリンク

概要

著者

関連論文

スポンサーリンク