张炎
,
孙玉福
,
刘晓芳
,
关绍康
钢铁
研究了不同铝含量的Fe-25Cr-20Ni在900℃、1000℃和1100℃的高温氧化行为.其中,Fe-25Cr-20Ni-4.72A1在900℃、1 000℃和1 100℃时的平均氧化速度比Fe-25Cr-20Ni分别降低47.14%、58.14%和17.49%.X射线衍射分析结果表明,氧化膜主要为Fe、Cr的氧化物和尖晶石(NiCr2O4、FeCrzO4),其中在Fe-25Cr-20Ni-4.72A1合金中检测到了A12O3.对氧化后试样截面进行扫描电镜观察和能谱分析,结果表明,不含铝以及铝的质量分数为1.68%和7.10%的试样氧化后氧化膜分为两层:即厚度较为均匀,存在较多的破碎、剥落的外层和外层与基体之间的较为致密,但存在空穴的内层;铝的质量分数为4.72%的试样氧化膜较为致密,基本无剥落,分层现象不明显,生成的AlzOa存在于氧化膜的最外层,有效防止了材料的进一步氧化.
关键词:
抗磨耐热钢
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AI
,
抗氧化性
,
氧化动力学
YU Jingfen JI Chen PAN Xiaomei XIONG Yigang Tsinghua University
,
Beijing
,
China
金属学报(英文版)
The interfacial kinetics,micellization and interfacial characteristics of the synergetic extrac- tion system,D_2EHPA-H_2RPA-Al~(3+),have been studied.H_2RPA is a single long chain alkyl phosphate.We have found that H_2RPA in the mixed extractant system strongly exhibits the characteristics of micellization and interfacial activity.As the concentration of D_2EHPA in- creases,the micellization and interracial activity of H_2RPA decrease.The interfacial adsorption behaviour of H_2RPA is opposite to that of D_2EHPA.It was proved that the kine- tics of non-micella mixed extraction system was controlled by the chemical reaction at inter- face,and the reaction rate equation was obtained.This non-micella mixed extraction system is expected to be used in the future.
关键词:
D_2EHPA-H_2RPA-Al~(3+) extraction system
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null
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null
,
null
MAO Weimin ** University of Science and Technology Beijing
,
100083
,
China.
材料科学技术（英文）
The influence of widening and initial Cube tex- ture on formation of rolling and recrystallization texture was investigated in high purity Al.With in- creasing widening the initial Cube texture has ro- tated more around rolling direction(RD)and less around transverse direction(TD).Therefore,more orientations rotate in x-fibre between G{110} <001>and B{110}<112>positions,and less in S{124}<211>texture component,which shows the widening plays an important role in the forma- tion of S component during rolling.The relation- ship between rolling and recrystallization texture components is discussed.Though the transition band predicted by Dillamore and Katoh is always formed during rolling,the most important factor in- fluencing recrystallization texture should be the ori- ented growth according to the changes of volume fractions and scatter widths of texture components with widening.
关键词:
texture
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null
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null
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null
