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工业纯锆室温蠕变性能及显微组织研究
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1.西安建筑科技大学冶金工程学院;2.西安欧中材料科技有限公司

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国家自然科学基金(51474170)、陕西省自然科学基金(2016JQ5026)和陕西省教育厅科技专项(14JK1391)联合资助


Creep Properties and Microstructure of Commercial Purity Zirconium at Ambient Temperature
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School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Metallurgical Engineering Technology Research Center of Shaanxi Province,Xi’an

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    摘要:

    本文分别研究了不同状态工业纯锆在0.9R_p0.2、0.925R_p0.2、0.95R_p0.2、0.975R_p0.2蠕变应力下的室温蠕变性能,计算了不同状态工业纯锆的稳态蠕变速率及蠕变应力,并分析了退火前后以及蠕变前后工业纯锆的微观组织。试验结果表明:不同状态工业纯锆的室温蠕变均存在阈值应力,当外加蠕变应力大于阈值应力时,随着蠕变应力的增加,工业纯锆位错密度显著增加,晶界处呈现出明显的位错塞积现象;与粗晶工业纯锆相比,经250°C退火处理后的超细晶工业纯锆,既能维持晶粒尺寸及稳定的显微组织状态,同时还能保证原有的高强度并提高其塑性;另外,250°C退火处理显著提高超细晶工业纯锆室温蠕变性能,使室温蠕变应力敏感性降低,室温蠕变抗性增加。

    Abstract:

    The creep tests were carried out on commercial purity zirconium (CP-Zr) in different states under the stresses of 0.9R_p0.2、0.925R_p0.2、0.95R_p0.2、0.975R_p0.2 at ambient temperature (AT). Steady state creep rate and creep stress were calculated. The microstrutures of CP-Zr before and after annealing and creep tests were analysied. The results indicate that the threshold stress of CP-Zr in different states exists in creep tests at AT. When the creep stress is greater than the threshold stress value, the density of dislocation of CP-Zr obviously increases with the creep stress increasing, the significant dislocation pile-up can be observed at grain boundaries. It is found that the UFG CP-Zr after annealing at 250°C can not only maintain grain size and stable microstructure, but also keep the original high strength and improve the plasticity compared with CG CP-Zr. In addition, the annealing treatment at 250°C can improve the creep properties of UFG CP Zr, weaken the creep stress sensitivity and enhance the creep resistance.

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杨西荣,王欣晗,朱振,罗雷,刘晓燕,赵西成.工业纯锆室温蠕变性能及显微组织研究[J].稀有金属材料与工程,2019,48(11):3701~3707.[Yang Xirong, Wang Xinhan, Zhu Zhen, Luo Lei, Liu Xiaoyan, Zhao Xichen. Creep Properties and Microstructure of Commercial Purity Zirconium at Ambient Temperature[J]. Rare Metal Materials and Engineering,2019,48(11):3701~3707.]
DOI:10.12442/j. issn.1002-185X.20180675

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  • 收稿日期:2018-06-26
  • 最后修改日期:2018-07-12
  • 录用日期:2018-07-30
  • 在线发布日期: 2019-12-10
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