热处理制度对N18新锆合金耐腐蚀性能的影响

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基金项目:

上海市教委发展基金资助项目(03AK24)

国家自然科学基金资助项目(50301009)

Effect of Heat Treatment on the Corrosion Resistance for New Zirconium-Based Alloy

摘要: 将N18锆合金样品分别进行多种变形热处理后,用高分辨透射电镜研究它们的显微组织和第二相粒子,然后把样品放入高压釜,在350℃、16.8MPa、0.01mol·L^-1LiOH溶液中进行腐蚀。结果表明:800℃-1h/冷轧/500℃-30h处理的样品,其耐腐蚀性能最好。分析该样品的第二相粒子,发现除了Zr (Fe,Cr)₂第二相粒子外,该样品中还存在Nb含量较高的细小的Zr-Nb-Fe第二相粒子;这会降低Nb元素在基体αZr中的固溶含量,提高N18锆合金的耐腐蚀性能。
- 热处理 /
- 耐腐蚀性能 /
- 显微组织 /
- 第二相粒子
Abstract: After being treated in different ways, N18 zirconium alloy specimens are exposed in 0.01mol · L^-1 LiOH aqueous solution at 350℃, 16.8MPa. The microstructures of these specimens are carried out by high-resolution transmission electron microscopy （HRTEM）. The specimen treated by 800℃/C. R/ 500℃ has best corrosion resistance among all the specimens. TEM examination shows, in addition to Zr（Fe,Cr）₂, there exist Zr-Nb-Fe SPPs, which containing much more Nb element, in the specimen. The existence of Zr-Nb-Fe SPPs is helpful to the reduction of niobium content in αZr solid solution and results in an improvement in the corrosion resistance of N18 zirconium alloy.
- Heat treatment /
- Orrosion resistance /
- Microstructure /
- Second phase particles