19Cr-13Ni-3Si 鋼の高温酸化におよぼす希土類元素添加の影響

概要

論文の詳細を見る
Effect of addition of rare earth metals (REM) up to 0.06% to Fe-19Cr-13Ni-3Si alloys containing 0.002 to 0.008% sulfur on their oxidation behavior at temperatures from 1000 to 1200℃ in air has been investigated by thermogravimetry, metallography, X-ray diffraction, EPMA, and chemical analysis. (1) Good correlation between the oxidation resistance and the REM/S is found. With an increase of the REM/S, the oxidation resistance is improved under both cyclic and continuous oxidizing conditions. (2) In case of the low REM/S, the oxidation resistance decreases because of early formation of Fe rich oxide and Si internal oxide grows markedly into substrate. (3) In case of the high REM/S, REM concentrate in the inner scales and the continuous layer of Si oxide is formed beneath Cr_2O_3 layer, and consequently the protective scale is retained much longer. (4) Effect of REM on the improvement of the oxidation resistance seems that REM concentrate in Cr_2O_3 scales and make Cr_2O_3 scales more protective. REM in solution except fixed REM to sulfide are effective.
社団法人日本鉄鋼協会の論文
1980-08-01