中文摘要：

通过超声喷丸处理在Zr-4合金表面获得细晶组织，400℃高压釜实验表明其耐蚀性能优于原始组织。采用场发射扫描电镜和X射线衍射，观察并计算了细晶组织的晶粒形貌与尺寸分布。采用金相显微镜、原子力显微镜和X射线衍射，分析了不同腐蚀时间的氧化膜形貌和结构的演变。结果表明，喷丸处理在细化晶粒的同时会增加样品表面微观缺陷，从而促进保护性氧化膜的形成，提高Zr-4均匀的耐腐蚀性能。

英文摘要：

A refined grain structure of Zr-4 alloy was obtained through USSP treatment. Autoclave test in 400℃ steam showed that its corrosion resistance was better than the as-received structure. Grain morphology and size distribution of the refined structure were observed by FEG-SEM and calculated by XRD. Oxide morphology and microstructure in different stage were characterized by OM, AFM and XRD. It suggested that the USSP treatment could increase the density of nucleation sites for passive films, which led to form a protective passive layer and enhanced the corrosion resistance of Zr-4 alloy.