氢对Zr-4合金在400℃时的低周疲劳性能的影响  

Effect of Hydrogen on Low Cycle Fatigue Property of Zr-4 Alloy at 400 ℃

作　　者：沈保罗[1] 刘明[1] 李聪[2] 邱绍宇[2] 应诗浩[2] 曾明[1] 

机构地区：[1]四川大学,四川成都610064 [2]中国核动力研究设计院,四川成都610041

出　　处：《稀有金属材料与工程》2007年第7期1135-1139,共5页Rare Metal Materials and Engineering

基　　金：核燃料与材料重点实验室基金(51481020202ZS8501)资助

摘　　要：用TEM分析了氢在Zr-4合金中存在的形式,用MTS809A/T拉扭试验机(25kN)研究了氢对Zr-4合金在400℃低周疲劳性能的影响。实验中采用对称拉压循环(Rε=εmin/εmax=–1),三角波加载;应变速率为2×10-3s-1。研究结果表明:在室温下,氢以δ氢化物的形式存在于Zr-4合金中,δ氢化锆基本与轧面平行;氢含量为240μg/g的Zr-4合金的低周疲劳性能优于无氢Zr-4合金。采用氢致软化机制讨论了氢提高Zr-4合金低周疲劳性能的原因。The existing form of hydrogen in a Zr-4 alloy was analyzed by TEM, and the effect of hydrogen on low cycle fatigue property of the Zr-4 alloy at 400 ℃ was studied by MTS809A/T-type fatigue tester（25 kN） in this paper. In the experiment, symmetrical tension/compression cycles （Rε =εmin/εmax=-l） and triangle wave loading were used with a train rate of 2 × 10^-3s^-1. The results show that at room temperature, the hydrogen exists in the form of 8-hydride parallel to the roll plane in Zr-4 alloy. The low cycle fatigue property is better at 400 ℃ for the Zr-4 alloy with hydrogen of 240μg/g than that of the Zr-4 alloy without hydrogen. A hydrogen-induced softening mechanism is used to discuss why the hydrogen can improve the low cycle fatigue property of the Zr-4 alloy.

关 键 词：ZR-4合金 低周疲劳 氢致软化 

分 类 号：TL341[核科学技术—核技术及应用]