摘要
利用静态高压釜腐蚀实验和SEM、TEM/EDS分析方法,以Zr-0.8Sn-0.25Nb-0.35Fe-0.1Cr-0.05Ge合金为对象,研究了β相水淬后不同退火工艺对合金的显微组织及在400℃/10.3 MPa过热蒸汽中耐腐蚀性能的影响。结果表明:500℃退火处理的样品发生了部分再结晶,退火时间对第二相尺寸的影响不明显;580℃退火处理的样品发生了完全再结晶,并且随着退火时间的延长,第二相的尺寸增大;合金元素主要以密排六方的Zr(Nb,Fe,Cr)_2、四方的Zr_3Ge和正交的Zr_3Fe第二相析出;该合金在400℃/10.3 MPa过热蒸汽中的耐腐蚀性能随着退火温度的升高和退火时间的延长而提高。
The corrosion resistance of Zr-0.8Sn-0.25Nb-0.35Fe-0.1Cr-0.05 Ge alloy treated by different annealing processes was studied in 400 °C/10.3 MPa super-heated steam by autoclave tests. The microstructure of the samples was investigated by TEM/EDS and SEM. The results show that partial recrystallization occurs in the samples annealed at 500 °C, and the effect of annealing time on the size of second phase particles（SPPs） is not obvious; while complete recrystallization occurs in the samples annealed at 580 °C; with the prolongation of annealing time, the SPPs are enlarged in the alloy. There exist Zr（Nb,Fe,Cr）_2 SPPs with a hexagonal close packed structure, tetragonal Zr_3 Ge and orthogonal Zr_3 Fe SPPs. The corrosion resistance of Zr-0.8Sn-0.25Nb-0.35Fe-0.1Cr-0.05 Ge alloy in 400 °C/10.3 MPa super-heated steam is improved with the prolongation of annealing time and increase of annealing temperature.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2017年第1期201-206,共6页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51171102)
关键词
锆合金
退火处理
第二相
显微组织
耐腐蚀性能
zirconium alloy
annealing process
second phase particles
microstructure
corrosion resistance
