氢对锆合金模拟LOCA试验后残余塑性的影响  

Effect of Hydrogen on Residual Ductility of Zr-Sn-Nb Alloy After LOCA Test

作　　者：刘鑫[1] 涂蒙河 李燊 王辉[1] 胡勇[1] Liu Xin;Tu Menghe;Li Shen;Wang Hui;Hu Yong(China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《稀有金属材料与工程》2024年第6期1626-1631,共6页Rare Metal Materials and Engineering

基　　金：中核集团领创科研项目(LC202309000320)。

摘　　要：锆合金包壳在堆内吸氢,失水事故(LOCA)下锆合金包壳会脆化,含氢包壳在事故进程或事故后续处理中更易破裂,造成放射性产物泄漏。对不同氢含量(0、195、310、395μg/g)锆合金模拟LOCA试验后残余塑性进行研究,探索了氢对锆合金模拟LOCA试验后残余塑性的影响机制。结果表明,随氢含量的增加,在模拟LOCA试验后锆合金残余塑性下降。氢的加入对锆合金显微组织结构影响较小,氢对锆合金微观组织结构的影响不是导致锆合金残余塑性降低原因。氢的存在导致锆合金模拟LOCA试验后残余塑性下降的原因之一是氢增加造成锆合金prior-β相中吸收氧含量提高,从而降低锆合金残余塑性,其次氢可能以饱和固溶或细小的氢化物脆性相方式存在于prior-β相中,也造成锆合金残余塑性下降。Zirconium cladding absorbs hydrogen in the reactor,and the zirconium cladding will embrittle in the loss of coolant accident(LOCA).The hydrogen-containing cladding is more likely to rupture in the process of accident or the subsequent treatment of accident,resulting in the leakage of radioactive products.In this research,residual ductility of zirconium alloys with different hydrogen contents(0,195,315,395μg/g)after simulated LOCA was studied,and the effect mechanism of hydrogen on residual ductility of zirconium alloys during simulated LOCA was explored.The results show that the residual ductility of zirconium alloy decreases with the increase in hydrogen content.The addition of hydrogen has little effect on the microstructure of zirconium alloy,and the effect of hydrogen on the microstructure of zirconium alloy is not the reason for the reduction of residual ductility of zirconium alloy.One of the reasons why the presence of hydrogen leads to the decrease in the residual ductility of zirconium alloy after simulated LOCA is that the increase in hydrogen content increases the oxygen content absorbed by the prior-βphase after quenching,thus reducing the residual ductility of zirconium alloy.Secondly,hydrogen may exist in the prior-βphase in the form of saturated solid solution or fine hydride brittle phase,which also decreases the residual ductility of zirconium alloy.

关 键 词：锆合金 氢 LOCA 残余塑性 氧含量 

分 类 号：TG146.414[一般工业技术—材料科学与工程] TL349[金属学及工艺—金属材料]