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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
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
关键词
ZR-4合金
低周疲劳
氢致软化
Zr-4 alloy
low cycle fatigue
hydrogen-induced softening
