氢含量对锆合金蠕变-疲劳行为的影响及机理研究  

Study on the Effect and Mechanism of Hydrogen Content on the Creep Fatigue Behavior of Zirconium Alloy

作　　者：陈乐[1] 许江涛 王朋飞[1] 李顺平[1] 戴训[1] 刘肖[1] CHEN Le;XU Jiangtao;WANG Pengfei;LI Shunping;DAI Xun;LIU Xiao(Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]中国核动力研究设计院反应堆燃料及材料重点实验室,成都610213

出　　处：《有色金属工程》2024年第4期43-50,共8页Nonferrous Metals Engineering

基　　金：反应堆燃料及材料国防科技重点实验室基金(6142A06020401)。

摘　　要：针对反应堆用锆合金渗氢后易发生蠕变-疲劳失效问题,采用频率修正应变寿命法和频率修正滞回能法研究了再结晶状态的锆合金在320oC、不同渗氢含量下的蠕变-疲劳行为。结果表明:随保持时间增加,无渗氢试样的抗蠕变-疲劳性能降低,但保持时间30 s以上时无明显影响;保持时间对渗氢试样的抗蠕变-疲劳性能无影响。不同保持时间下,未渗氢试样的抗蠕变-疲劳性能最好,0.04%氢含量试样的性能最差,0.005%氢含量在高应变水平(高滞回能)下的抗蠕变-疲劳性能弱于0.02%氢含量试样,而在低应变水平区域优于0.02%氢含量试样。氢含量的影响机理为:固溶氢可提高蠕变-疲劳寿命,氢化物可降低蠕变-疲劳寿命;0.04%氢含量试样中氢化物起主导作用,导致其蠕变-疲劳性能最差。This study investigates the creep-fatigue behavior of recrystallized zirconium alloy at 320℃and different hydrogen contents using frequency-corrected strain life and frequency-corrected hysteresis energy methods.The results indicate that as the holding time increases,the creep-fatigue resistance of the non-hydrogen permeation sample decreases,but there is no significant effect when holding time exceeds 30 s.However,the effect of holding time on the creep-fatigue resistance of hydrogen permeation sample is not significant.It was found that the non-hydrogen permeation sample had the best creep-fatigue resistance,while the 0.04%hydrogen permeation sample had the worst resistance.The creep-fatigue resistance of the 0.005%hydrogen permeation sample was weaker at high strain levels(high hysteresis energy)than that of the 0.02%hydrogen permeation sample,and better than that of the 0.02%hydrogen permeation sample at low strain levels.The effect mechanism of hydrogen content on creep-fatigue behavior:solid solution hydrogen can increase creep-fatigue life,while hydrides can reduce creep-fatigue life.The hydride plays a dominant role in the sample with hydrogen content of 0.04%,resulting in the worst creep-fatigue performance.

关 键 词：锆合金 蠕变-疲劳 渗氢 滞回能 

分 类 号：TG146.414[一般工业技术—材料科学与工程] TL341[金属学及工艺—金属材料]