Zr-2合金中应力及应变诱发氢化锆析出过程的电子显微镜原位研究

金属学报

1989, Vol. 25

Issue (3): 34-39

论文

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Zr-2合金中应力及应变诱发氢化锆析出过程的电子显微镜原位研究

周邦新;郑斯奎;汪顺新

西南反应堆工程研究设计院;西南反应堆工程研究设计院;西南反应堆工程研究设计院

IN SITU ELECTRON MICROSCOPY STUDY ON PRECIPITATION OF ZIRCONIUM HYDRIDES INDUCED BY STRAIN AND STRESS IN ZIRCALOY-2

ZHOU Bangxin;ZHENG Sikui;WANG Shunxin Southwest Centre for Nuclear Reactor Engineering Research and Design Chengdu

引用本文:

周邦新;郑斯奎;汪顺新. Zr-2合金中应力及应变诱发氢化锆析出过程的电子显微镜原位研究[J]. 金属学报, 1989, 25(3): 34-39.
, , . IN SITU ELECTRON MICROSCOPY STUDY ON PRECIPITATION OF ZIRCONIUM HYDRIDES INDUCED BY STRAIN AND STRESS IN ZIRCALOY-2[J]. Acta Metall Sin, 1989, 25(3): 34-39.

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摘要:

用电子显微镜原位研究了Zr-2合金中的氢化锆在应力及应变作用下的析出过程。应力诱发析出的氢化锆为γ相,与基体间存在(110)_γ//(1120)_(αZr),(001)_γ//(0001)_(αZr)的取向关系。γ氢化锆沿它的[110]生长最快,形成尖劈状。当沿氢化锆开裂后,在裂纹端部又将析出氢化锆。应变诱发析出的氢化锆为δ相,与基体间存在(111)_δ//(0001)_(αZr),(110)_δ//(1120)_(αZr);或(010)_δ//(0001)_(αZr),(001)_δ//(1120)_(αZr)的取向关系。形变速率越高,δ氢化锆越细小。

关键词 ： Zr-2合金, 氢化物析出, 氢致延迟开裂

Abstract：

The precipitation hydrides induced by stress were found to be gammaphase with orientation relationship of (110)_γ//(1120)_(αZr),(001)γ//(0001)_(αZr)between γ-hydride and surrounding matrix. The growth of-hydrides exhibiter a quickest ratealong [110] direction, that brings them in taper shape. After cracking at hydridematrix beundary, a new one will precipitate at the tip of cracks. This isthe essential process of hydrogen-induced delayed cracking in zircaloy The pre-cipitating hydrides induced by strain were found to be delta phase Phase with bothorientation relationships of (111)_δ//(0001)_(αZr)(110)_δ//(1120)_(αZr) and (010)_δ//(0001)_(αZr)(001)_δ//(1120)_(αZr) between δ-hydride and surrouding matrix. The δ-hydride becomesmuch finer as the strain rate increased.

Key words： Zircaloy-2 Precipitation of hydrides hydrogen-induced delayed cracking

收稿日期: 1989-03-18

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