奥氏体<strong>316</strong>不锈钢中位错与氢的相互作用机理

doi:10.11900/0412.1961.2020.00332

金属学报

2021, Vol. 57

Issue (7): 913-920 DOI: 10.11900/0412.1961.2020.00332

研究论文

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奥氏体316不锈钢中位错与氢的相互作用机理

安旭东¹^,², 朱特¹, 王茜茜¹^,², 宋亚敏¹, 刘进洋¹, 张鹏¹, 张钊宽¹, 万明攀²(

), 曹兴忠¹(

)

^1.中国科学院高能物理研究所北京 100049
^2.贵州大学材料与冶金学院贵阳 550025

Interaction Mechanism of Dislocation and Hydrogen in Austenitic 316 Stainless Steel

AN Xudong¹^,², ZHU Te¹, WANG Qianqian¹^,², SONG Yamin¹, LIU Jinyang¹, ZHANG Peng¹, ZHANG Zhaokuan¹, WAN Mingpan²(

), CAO Xingzhong¹(

)

^1.Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
^2.College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China

引用本文:

安旭东, 朱特, 王茜茜, 宋亚敏, 刘进洋, 张鹏, 张钊宽, 万明攀, 曹兴忠. 奥氏体316不锈钢中位错与氢的相互作用机理[J]. 金属学报, 2021, 57(7): 913-920.
Xudong AN, Te ZHU, Qianqian WANG, Yamin SONG, Jinyang LIU, Peng ZHANG, Zhaokuan ZHANG, Mingpan WAN, Xingzhong CAO. Interaction Mechanism of Dislocation and Hydrogen in Austenitic 316 Stainless Steel[J]. Acta Metall Sin, 2021, 57(7): 913-920.

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摘要:

对冷变形引入位错缺陷的奥氏体316不锈钢进行电化学充氢实验，采用正电子湮没谱学和热脱附谱仪对样品的氢致缺陷和充氢含量进行实验分析，研究位错对氢致缺陷的形成及氢在材料中滞留行为的作用。结果表明，充氢后正电子湮没Doppler展宽能谱的S参数增大，形变样品的S参数变化更为明显，表明形变样品充氢后形成了大量的空位型缺陷，而且H原子有可能在位错附近聚集形成大量开体积缺陷。S-W曲线显示充氢后正电子湮没参数向近表面移动，反映了样品中位错缺陷对H原子扩散行为的抑制作用，分析表明，充氢过程中氢与空位(V)结合形成H_mV_n(n > m)复合体的过程优先于空位缺陷的形成过程。热脱附谱结果显示，氢从位错中的脱附激活能增加，位错的存在使氢的滞留量增加。

关键词 ：奥氏体316不锈钢, 位错, 氢致缺陷, 正电子湮没谱学

Abstract：

The formation of hydrogen-induced defects in 316 stainless steel and the interaction between hydrogen and defects are crucial aspects to understand the failure law of the hydrogen-induced mechanical properties. Introducing various types of hydrogen sinks, such as interfaces and dislocations, is a popular method for reducing the concentration of residual hydrogen and curbing the mobility of hydrogen atoms in materials. In this work, positron annihilation spectroscopy and thermal desorption spectroscopy (TDS) were used to measure the distribution of hydrogen-induced defects and hydrogen content in deformed 316 stainless steel with hydrogen charging. In particular, the influence of dislocations on the formation of hydrogen-induced defects and the hydrogen retention behavior in the specimens were experimentally investigated. The results show that the S-parameter increases upon hydrogen charging, and the W-parameter is negatively correlated with the S-parameter. The S-parameter value of the deformed sample was found to be larger than that of the annealed sample, indicating that the introduction of hydrogen results in the formation of vacancy defects in the sample. Additionally, hydrogen atoms may gather together to form a large number of volume defects near dislocations. The S-W curves show that the (S, W) point for the sample containing dislocations aggregates towards the surface after hydrogen charging, due to the hindered dislocation motion. In the deformed samples with low hydrogen charge current density, the vacancy formation rate was found to be slow, and the combination of excess hydrogen and vacancies was observed to give rise to hydrogen-vacancy clusters (H_mV_n), where n > m. The TDS results show that both the activation energy for hydrogen desorption and the amount of hydrogen retention increase due to the presence of dislocations.

Key words： austenitic 316 stainless steel dislocation hydrogen damage positron annihilation spectroscopy

收稿日期: 2020-08-28

ZTFLH:

TG142.25

基金资助:国家重点研发计划项目(2019YFA0210002);国家自然科学基金项目(11775235、U1732265)

作者简介: 安旭东，男，1994年生，硕士生

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	安旭东
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	刘进洋
	张鹏
	张钊宽
	万明攀
	曹兴忠
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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00332 或 https://www.ams.org.cn/CN/Y2021/V57/I7/913

表1 奥氏体316不锈钢退火条件和电化学充氢参数

图1 不同退火条件316不锈钢样品电化学充氢前后S参数和ΔS与正电子入射能量(E)的关系曲线

图2 不同退火条件下奥氏体316不锈钢电化学充氢的S-W曲线

图3 500℃退火1 h样品在不同充氢条件下的S参数和ΔS与正电子入射能量的关系曲线

图4 500℃退火1 h样品在不同充氢条件下的W参数和ΔW参数与正电子入射能量的关系曲线

图5 500℃退火1 h样品在不同充氢条件下的XRD谱

图6 500℃退火1 h后在不同充氢条件下奥氏体316不锈钢的S-W曲线

图7 奥氏体316不锈钢电化学充氢样品的热氢脱附谱

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