HU Benfu University of Science and Technology Beijing
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Beijing
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ChinaTAKAHASHI Heishichiro
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ITOH Hisatoshi
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TAKEYAMA Taro Hokkaido University
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Sapporo
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060
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Japan Associate Professor
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Dept of Materials Science and Engineering
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University of Science and Technology Beijing
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Beijing 100083
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China
金属学报(英文版)
The behavior of void swelling and segregation in Fe-15Cr-xMn alloys and an alloy con- taining small amount of W and V was investigated by electron-irradiation.The compositional analysis in the irradiated regions including grain boundaries was performed.The resultdts show that there are many common features of irradiuation tehavior in the Fe-Cr-Mn and Fe-Cr-Ni systems while there are some significant differences,In the Fe-Cr-Mn alloy sys- tems void swelling was rematrkably suppressed and at the same time the radiation-induced segregation was also retarded,furthermore,the segregation was strongly retarded in an Fe-15Cr-15Mn alloy containing small amount of W and V.The results also show that Ni re- placed by Mn does not in general confer immunity from either swelling or phase instabilities. The phase instability is due to the different diffusion behavior of Ni and Mn in reponse to the operation of the inverse-Kirkendall effecr.Fe segregates to the microstructural sinks in the Fe-Cr-Mn alloys.The segregation of Fe often leads to the formation of ferrite.This fact is beneficial to reducing the swelling rate and segregation on the grain boundaries.
关键词:
electron irradiation
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null
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null
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null
潘太军
,
陈婧
,
李杰
,
胡静
腐蚀科学与防护技术
doi:10.11903/1002.6495.2015.149
研究比较了Fe-13Cr-xMn(x=0.5,1,2)系列合金在干燥和湿润空气中800℃下的氧化行为.结果表明,在干燥气氛中合金表现出良好的抗氧化性能,当Mn含量低于1％时有助于合金表面生成阻碍Cr挥发的(Mn,Cr)3O4尖晶石相;而当Mn含量达到2％,合金表面则会产生Mn2O3,从而影响合金的抗高温氧化性能.在含水蒸气气氛中,合金发生了失稳态氧化,表面生成了大量氧化物,合金的氧化速率随Mn含量的增大而减小,主要原因是Mn含量增加导致膜层中形成(Mn,Cr)3O4尖晶石相,从而有效阻碍了水气环境中Cr的挥发,尤其Fe-13Cr-2Mn合金在氧化初期12h内并没有发生加速腐蚀,Fe-Cr-Mn合金的加速氧化是由表面氧化铬膜与水蒸气发生反应所致.通过SEM,XRD等分析手段深入探讨了合金加速氧化机制以及Mn效应.
关键词:
Fe-Cr-Mn合金
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氧化
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Cr挥发
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Mn效应
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水蒸气
胡本芙
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高桥平七郎
金属学报
采用超高压电镜与离子加速器相连结的复合辐照装置, 研究了注He对
低活性Fe-Cr-Mn (W, V)合金辐照产生的点缺陷及二次缺陷行为的影响. 实验结果
表明: 辐照初期形成的点缺陷与He相互作用, 进而影响二次缺陷(位错、位错
环和空洞)的形成；He明显促进位错密度增大和空洞核心形成, 并导致空洞肿胀
增加. 对辐照产生的点缺陷与He相互作用的机理进行了理论分析.
关键词:
Fe-Cr-Mn合金
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irradiation damage
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helium
