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选用无织构的Zr-0.72Sn-0.32Fe-0.14Cr和Zr-0.85Sn-0.16Nb-0.37Fe-0.18Cr合金大晶粒片状样品,利用静态高压釜在500℃,10.3 MPa过热蒸汽中进行500 h的腐蚀实验,采用EBSD,SEM和TEM等方法研究了合金的显微组织以及氧化膜的厚度与金属晶粒表面取向的关系.结果表明,Nb对第二相的晶体结构产生影响,Zr-0.72Sn-0.32Fe-0.14Cr合金中的第二相主要为fcc的Zr(Fe,Cr)2,而Zr-0.85Sn-0.16Nb-0.37Fe-0.18Cr合金中的第二相为fcc和hcp的Zr(Nb,Fe,Cr)2;2种合金均未出现疖状腐蚀,并且不同金属晶粒取向上的氧化膜厚度没有明显差别,即没有表现出腐蚀各向异性特征.
The large grain flake samples of un-textured Zr-0.72Sn-0.32Fe-0.14Cr and Zr-0.85Sn-0.16Nb-0.37Fe-0.18Cr alloy were prepared by static autoclave in supercritical steam at 500 ℃ and 10.3 MPa The corrosion experiment of 500 h was carried out and the relationship between the microstructure of the alloy and the surface orientation of the metal grain was investigated by EBSD, SEM and TEM.The results showed that Nb had influence on the crystal structure of the second phase, The second phase in the Zr-0.72Sn-0.32Fe-0.14Cr alloy is mainly fcc Zr (Fe, Cr) 2 and the second phase in the Zr-0.85Sn-0.16Nb-0.37Fe-0.18Cr alloy is fcc And hcp (Zr, Nb, Fe, Cr) 2, respectively. All of the two alloys showed no pitting corrosion, and there was no significant difference in the thickness of the oxide film on the orientation of the different metal grains, that is, no corrosion anisotropy was observed.