摘要
对新型Zr-Sn-Nb系SZA-4锆合金管材进行电解渗氢处理,研究了渗氢时间对SZA-4锆合金吸氢量和氢化物类型及分布的影响规律,以及均匀化退火对氢化物类型及分布的影响规律。结果表明,随着电解渗氢时间延长,SZA-4错合金管材的吸氢量增加,吸氢量与渗氢时间之间符合抛物线关系。显微组织分析表明,锆合金电解渗氢后在样品表面形成一层氢化物层,而内部仍为锆合金基体。随着渗氢时间延长,该氢化物层的厚度增加。对氢化物层的相结构分析表明,渗氢时间较短时,氢化物层由δ-ZrH1.66相组成;随着渗氢时间延长,氢化物层中的δ-ZrH1.66相含量增加;渗氢24h后,氢化物层由ε-ZrH1.801相和δ-ZrH1.66相组成。对渗氢试样400℃/6h均匀化退火处理后,发现氢化物层厚度进一步增加,且在样品内部沿周向有条状氢化物析出。相结构分析显示,此时氢化物层中ε-ZrH1.801相消失,原来的δ-ZrH1.66氢化物转变为δ-ZrH1.5氢化物。而经400℃/96 h均匀化退火处理后,氢化物层消失,细小条状氢化物均匀分布于试样中。
The cladding tubes of a newly designed SZA-4 zirconium alloy of Zr-Sn-Nb system were hydrided using electrolytic hydrogen charging technique.The effect of electrolytic hydrogen charging time on the hydrogen absorption amount and the type and distribution of hydrides,as well as the effect of homogenization annealing time on the type and distribution of hydrides in SZA-4 zirconium alloy were investigated.The results show that the hydrogen absorption amount of samples increases with the increase of hydrogen charging time,and a parabola relationship between hydrogen absorption amount and hydrogen charging time was found.Microstructure analysis shows that the hydride layers form on the surface of the samples after electrolytic hydrogen charging,while the inner part remains the zirconium alloy matrix.And the thickness of the hydride layers increases with the increase of hydrogen charging time.The phase structure analysis shows that the hydride layer is merely composed of δ-ZrH1.66 at the beginning and increases with hydrogen charging time.When hydrogen charging time reaches 24 h,the hydride layer is composed of ε-ZrH1.801 and δ-ZrH1.66 phase.After 400 ℃/6 h homogenization annealing,the thickness of the hydride layer of hydriding samples further increases,and platelet-like hydrides precipitate within the tubes along the circumferential direction.The phase structures analysis of the homogenization annealing of hydriding samples shows that ε-ZrH1.801disappears and the original δ-ZrH1.66 hydride transforms into δ-ZrH1.5 hydride in hydride layers.And after 400 ℃/96 h homogenization annealing treatment,all of hydride layers disappear,and thin platelet-like hydrides evenly distribute in the samples.
作者
张寅
张诚
袁改焕
高博
宋西平
Zhang Yin;Zhang Cheng;Yuan Gaihuan;Gao Bo;Song Xiping(State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China;State Nuclear Bao Ti Zirconium Industry Company,Baoji 721013,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第8期2602-2608,共7页
Rare Metal Materials and Engineering
基金
国家自然科学基金(21171018,51271021)
新金属材料国家重点实验室资助项目(2016-T02)
关键词
锆合金
电解渗氢
氢化物
zirconium alloy
electrolytic hydrogen charging
hydride