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锆合金电解渗氢工艺及组织演变研究
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1.北京科技大学新金属材料国家重点实验室;2.国核宝钛锆业股份公司

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国家自然科学基金资助(项目号21171018和51271021)和新金属材料国家重点实验室资助


Study of electrolytic hydrogen charging process and microstructure evolution of zirconium alloy
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1.State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing;2.State Nuclear Bao Ti Zirconium Industry Company

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    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锆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24 h后,氢化物层由ε-ZrH1.801相和δ-ZrH1.66相组成。对渗氢试样400 ℃/6 h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。

    Abstract:

    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 the distribution of hydrides, as well as the effect of homogenization annealing time on the type and the distribution of hydrides in SZA-4 zirconium alloy were investigated. The results showed that the hydrogen absorption amount of samples increased with the hydrogen charging time, and a parabola relationship between hydrogen absorption amount and hydrogen charging time was found. Microstructure analysis showed that the hydride layers were formed on the surface of the samples after electrolytic hydrogen charging, while the inner part remained the zirconium alloy matrix. And the thickness of the hydride layers increased with the increase of hydrogen charging time. The phase structure analysis showed that the hydride layer was merely composed of δ-ZrH1.66 at the beginning and increased with hydrogen charging time. When hydrogen charging time reached 24 hours, the hydride layer was 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 increased, and platelet-like hydrides precipitates within the tubes along the circumferential direction were found. The phase structures analysis of the homogenization annealing of hydriding samples showed that ε-ZrH1.801 disappeared and the original δ-ZrH1.66 hydride transformed into δ-ZrH1.5 hydride in hydride layers. And after 400 ℃/96 h homogenization annealing treatment, all of hydride layers disappeared, and thin platelet-like hydrides were evenly distributed in the samples.

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张寅,张诚,袁改焕,高博,宋西平.锆合金电解渗氢工艺及组织演变研究[J].稀有金属材料与工程,2019,48(8):2602~2608.[Zhang Yin, Zhang Cheng, Yuan Gaihuan, Gao Bo, Song Xiping. Study of electrolytic hydrogen charging process and microstructure evolution of zirconium alloy[J]. Rare Metal Materials and Engineering,2019,48(8):2602~2608.]
DOI:10.12442/j. issn.1002-185X.20180011

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  • 收稿日期:2018-01-03
  • 最后修改日期:2018-02-02
  • 录用日期:2018-02-09
  • 在线发布日期: 2019-09-05
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