| EFFECTS OF ACTIVE ELEMENTS Y AND Ce ON HIGH TEMPERATURE OXIDATION OF Fe-25Cr-40Ni ALLOY |
| |
| 作者姓名： | YU Fanghua YANG Guohua Shanghai Institute of Nuclear Research Academia Sinica Shanghai ChinaHAN Rongdian WENG Huimin University of Science and Technology of China Hefei ChinaSHEN Jianian Corrosion Science Laboratory Institute of Corrosion and Protection of Metals Academia Sinica Shenvang China |
| |
| 作者单位： | YU Fanghua YANG Guohua Shanghai Institute of Nuclear Research，Academia Sinica，Shanghai，ChinaHAN Rongdian WENG Huimin University of Science and Technology of China，Hefei，ChinaSHEN Jianian Corrosion Science Laboratory，Institute of Corrosion and Protection of Metals Academia Sinica，Shenvang，China |
| |
| 摘 要： | The effects of small amount(≥0.05%)of active elements Y and Ce in Fe-25Cr-40Ni al-loy have been investigated on the kinetics of early stage of high temperature oxidationas well as composition and microsructure of oxide film by ion backscattering and slowpositron beam.The results show that Y and Ce can reduce evidently the high tem-perature oxidation rate of FeCrNi alloy at early stage and can effectively enhance theCr_2O_3 formation and retard the oxide formation of Fe and Ni in the surface layer thusthe microstructure of the oxide film is improved.Y and Ce enter the oxide film andconcentrate within several tens nanometres from surface of the outer layer.The mech-anism of oxidation resistance for Ce is different from Y.Ce can decrease the densityof vacancy defects in oxide layer,so the cations are restrained from diffusion outwardthrough vacancies.While Y can control the outward diffusion of cations through va-cancies at the early statge of oxidation(shorter than 12 min),aften that restrained thecations from diffusion outward along grain boundaries up to 60 min oxidation.
|
| 收稿时间： | 1992-11-11 |
| 修稿时间： | 1992-11-11 |
EFFECTS OF ACTIVE ELEMENTS Y AND Ce ON HIGH TEMPERATURE OXIDATION OF Fe-25Cr-40Ni ALLOY |
| |
| YU Fanghua YANG Guohua Shanghai Institute of Nuclear Research,Academia Sinica,Shanghai,ChinaHAN Rongdian WENG Huimin University of Science and Technology of China,Hefei,ChinaSHEN Jianian Corrosion Science Laboratory,Institute of Corrosion and Protection of Metals Academia Sinica,Shenvang,China.EFFECTS OF ACTIVE ELEMENTS Y AND Ce ON HIGH TEMPERATURE OXIDATION OF Fe-25Cr-40Ni ALLOY[J].Acta Metallurgica Sinica(English Letters),1992,5(11):383-390. |
| |
| Authors: | YU Fanghua YANG Guohua |
| |
| Affiliation: | YU Fanghua YANG Guohua Shanghai Institute of Nuclear Research,Academia Sinica,Shanghai,ChinaHAN Rongdian WENG Huimin University of Science and Technology of China,Hefei,ChinaSHEN Jianian Corrosion Science Laboratory,Institute of Corrosion and Protection of Metals Academia Sinica,Shenvang,China |
| |
| Abstract: | The effects of small amount(≥0.05%)of active elements Y and Ce in Fe-25Cr-40Ni al- loy have been investigated on the kinetics of early stage of high temperature oxidation as well as composition and microsructure of oxide film by ion backscattering and slow positron beam.The results show that Y and Ce can reduce evidently the high tem- perature oxidation rate of FeCrNi alloy at early stage and can effectively enhance the Cr_2O_3 formation and retard the oxide formation of Fe and Ni in the surface layer thus the microstructure of the oxide film is improved.Y and Ce enter the oxide film and concentrate within several tens nanometres from surface of the outer layer.The mech- anism of oxidation resistance for Ce is different from Y.Ce can decrease the density of vacancy defects in oxide layer,so the cations are restrained from diffusion outward through vacancies.While Y can control the outward diffusion of cations through va- cancies at the early statge of oxidation(shorter than 12 min),aften that restrained the cations from diffusion outward along grain boundaries up to 60 min oxidation. |
| |
| Keywords: | ion backscattering slow positron beam oxidation active elements FeCrNi alloy |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《金属学报(英文版)》浏览原始摘要信息 |
|
点击此处可从《金属学报(英文版)》下载全文 |
