|
|
|
| THE EFFECT OF YTTRIUM ADDITION ON THE OXIDATION OF THE Fe-Cr-Al ALLOY AT 1200℃ |
| Yin Yaode Luo Jixun and Zhao Qi (Institute of Metals Research; Chinese Academy of Sciences) |
|
|
|
|
Abstract The oxidation of Fe-Cr-Al and similar alloys containing 0.51% Y was studied in air at 1200℃ up to 500hrs. The oxide scales were analysed using X-ray diffraction, scanning electron microscope, electron and ion probe microanalysis. It can be seen from the kinetics data obtained that the alloy containing Y has slightly higher oxidation rates at initial stage, but after some 20hrs the weight gain of the alloy drops drastically. It is interesting to find out that the crystals of α-Al_2O_3 scales formed on Fe-Cr-Al-Y alloy are columnar grains perpendicular to the alloy-oxide surface. The oxide film of the yttrium containing alloy can with·stand higher compressive stress than that of the yttrium free alloy. The addition of yttrium to the heat-resistant Fe-Cr-Al alloy may remarkably enchance the adhesion of the oxide scale formed at elevated temperatures. Yttrium added to the alloy is concentrated at grain boundaries and will preferentially react with oxygen diffusing into the alloy matrix. The formation of Y_2O_3 at grain boundaries will prevent internal oxidation of the alloy.
|
|
Received: 25 April 1982
|
[1] 骆继勲、银耀德等,金属学报13,263(1977)
[2] 西安钢厂金属材料研究所、包钢冶金研究所,稀土与铌(1975)
[3] G.C.Wood, Werkstoffe und Korrosion 22, 491(1971)
[4] Y. Oishi, W.D.Kingery, J. Chem.Phys, 33, 480(1960)
[5] C. S. Wukusick and J.F.Collins, Mat. Res.Stand, 4, 637(1964)
[6] E. J. Felten, F.S.Pettit, Oxid.Met., 10, 189(1976)
[7] 张立新等,金属学报,16,411(1980)
[8] J.K.Tien and F.S.Pettit, Met. Trans., 3, 1587(1972)5 |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
