Zr-4合金薄板的织构与耐疖状腐蚀性能的关系  

Relationship between Nodular Corrosion Resistance and Textures for Zircaloy-4 Strip

作　　者：周邦新[1] 姚美意[1] 李强[1] 夏爽[1] 刘文庆[1] 

机构地区：[1]上海大学材料研究所,上海200072

出　　处：《上海大学学报（自然科学版）》2008年第5期441-445,共5页Journal of Shanghai University:Natural Science Edition

基　　金：国家973基金资助项目(61373);上海大学科研发展基金资助项目

摘　　要：采用500℃/10.3 MPa过热蒸汽中腐蚀的方法,研究热处理及织构取向对Zr-4合金薄板耐疖状腐蚀性能的影响.样品在820℃-1 h加热快冷后,晶粒发生长大,得到了集中的(0001)[11 20]和(0001)[10 10]织构,这时耐腐蚀性能比较好的(0001)面基本平行于轧面,而样品四周的侧面是耐腐蚀性能较差的(11 20)和(10 10)面.样品经过这样热处理后,增加了Fe和Cr合金元素在α-Zr中的过饱和固溶含量,提高了样品轧面的耐疖状腐蚀性能,但是样品的侧面上仍然会出现疖状腐蚀现象.耐疖状腐蚀性能的好坏与织构的晶体取向有关,只有当样品在1 000℃β相加热快冷,使Fe和Cr合金元素在α-Zr中的过饱和固溶含量进一步得到提高后,才能完全抑制疖状腐蚀现象.The effects of heat treatments and textures on the nodular corrosion resistance of Zircaloy-4 strip have been investigated in superheated steam of 500 ℃ and 10.3 MPa by autoclave tests. After heat treatment at 820 ℃-1 h and fast cooling, concentrated textures with （0001） [ 11 20] and （0001） [ 10 10] orientations were obtained after grain growth, and the supersaturated solid solution of alloying elements of Fe and Cr in α-Zr matrix was increased simultaneously. （0001） planes with better corrosion resistance were mainly parallel to the rolling plane of the specimens, while （ 10 10） and （ 11 20） planes with worse corrosion resistance were on the side planes around the specimens. In this case, the nodular corrosion resistance on the rolling plane of the specimens was improved but the nodular corrosion phenomena could also appear on the side planes around the specimens. The nodular corrosion behavior was closely related to the texture orientations. And it could be completely suppressed when the supersaturated solid solution contents of Fe and Cr in α-Zr matrix were further increased after heat treatment in β phase.

关 键 词：Zr4合金 疖状腐蚀 织构 热处理 

分 类 号：TL341[核科学技术—核技术及应用]