【摘要】 建立了纳米结构组织锆-4合金腐蚀速率-晶粒尺寸关系模型,计算了高温下纳米组织锆-4合金和腐蚀速率曲线,并与纳米组织锆-4合金在400℃水蒸气中的腐蚀试验数据进行了对比。结果表明:与普通晶粒相比,纳米晶粒尺寸下锆合金的速率低于普通晶粒锆-4合金的腐蚀速率,随着纳米晶粒尺寸的减小,锆-4合金的腐蚀速率也降低;同时,纳米化组织处理推迟了锆-4合金氧化转折时间,使其抗氧化性能得到了提高。更多还原

【Abstract】 In this paper a computation model of corrosion rate versus grain size of nanocrystalline zircaloy-4 has been presented. The corrosion rates of zircaloy-4 at high temperatures were computed and compared to experiment results of nanocrystalline zircaloy-4 in 400 ℃ steam. The results show that the corrosion resistance of nanocrystalline zircaloy-4 is superior to that of zircaloy-4 with coarse grain size. The corrosion rate constant and mass gain of nanocrystalline zircaloy-4 decrease with the decrease of grain size. So the refinement of grain size can delay the transition duration of the corrosion and remarkably improve the corrosion resistance of zircaloy-4.更多还原