摘要
Zr-4大晶粒样品在高压釜中经过500℃/10.3 MPa过热蒸气腐蚀,研究了不同晶粒表面上氧化膜厚度与晶粒取向的关系。结果表明:样品腐蚀时氧化膜的生长表现出明显的各向异性特征,晶粒表面取向在(10■0)和(11■0)之间时,氧化膜生长速率最快,腐蚀3 h后最先出现疖状腐蚀斑,当腐蚀时间延长至30 h时,晶粒表面的极点在反极图中间位置的那些晶粒表面上也逐渐产生疖状腐蚀斑,而晶粒表面取向在(0001)晶面附近时氧化膜生长速率最慢,即使腐蚀30 h也没有产生疖状腐蚀斑。结果表明:当第二相大小和分布以及Fe,Cr合金元素在α-Zr中的固溶含量相同的情况下,Zr-4合金的耐疖状腐蚀性能与样品表面的晶粒取向有着密切的关系。
Zircaloy-4 coarse-grained specimens were corroded at 500 °C/10.3 MPa in superheated steam. The relationship between oxide thickness and grain orientations of the specimens was investigated. The results indicate that the growth of the oxide films formed on the Zircaloy-4 specimen shows remarkable anisotropic characteristics. The growth rate of the oxide films on the grain surfaces with the orientation between prismatic plane of（ 10 ■0） and（ 11■0） is the fastest, and the nodular corrosion spots are first formed after 3 h exposure. The grain surfaces with the orientation whose poles are located at the middle of inverse pole figure start to form nodular corrosion spots for 30 h exposure gradually. The thinnest oxide layers are detected on the grain surfaces with the orientation nearby basal plane（0001）, and the nodular corrosion spots do not appear after 30 h exposure. Therefore, the nodular corrosion resistance of Zircaloy-4 is closely related to the grain orientations when the distribution and the size of second phase particles, and the solid solution content of Fe and Cr alloying elements in α-Zr matrix are at the same level.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2016年第12期3213-3217,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51171102)
关键词
ZR-4
疖状腐蚀
氧化膜生长各向异性
晶体取向
Zircaloy-4
nodular corrosion
anisotropy of oxide film growth
grain orientation
