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2.25Cr-1Mo-0.25V钢在电化学充氢条件下的氢浓度分布及其对力学性能的影响

Hydrogen Concentration Distribution in 2.25Cr-1Mo-0.25V Steel under the Electrochemical Hydrogen Charging and Its Influence on the Mechanical Properties.

作者信息

Yin Changdong, Chen Jianjun, Ye Dongdong, Xu Zhou, Ge Jiahao, Zhou Haiting

机构信息

School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China.

Department of Quality and Safety Engineering, China Jiliang University, Hangzhou 310018, China.

出版信息

Materials (Basel). 2020 May 14;13(10):2263. doi: 10.3390/ma13102263.

DOI:10.3390/ma13102263
PMID:32422989
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7288120/
Abstract

The deterioration of the mechanical properties of metal induced by hydrogen absorption threatens the safety of the equipment serviced in hydrogen environments. In this study, the hydrogen concentration distribution in 2.25Cr-1Mo-0.25V steel after hydrogen charging was analyzed following the hydrogen permeation and diffusion model. The diffusible hydrogen content in the 1-mm-thick specimen and its influence on the mechanical properties of the material were investigated by glycerol gas collecting test, static hydrogen charging tensile test, scanning electron microscopy (SEM) test, and microhardness test. The results indicate that the content of diffusible hydrogen tends to be the saturation state when the hydrogen charging time reaches 48 h. The simulation results suggest that the hydrogen concentration distribution can be effectively simulated by ABAQUS and the method can be used to analyze the hydrogen concentration in the material with complex structures or containing multiple microstructures. The influence of hydrogen on the mechanical properties is that the elongation of this material is reduced and the diffusible hydrogen will cause a decrease in the fracture toughness of the material, and thus hydrogen embrittlement (HE) will occur. Moreover, the Young's modulus E and microhardness are increased due to hydrogen absorption, and the variation value is related to the hydrogen concentration introduced into the specimen.

摘要

氢吸收导致的金属力学性能恶化威胁着在氢环境中服役设备的安全。在本研究中，依据氢渗透和扩散模型分析了2.25Cr-1Mo-0.25V钢充氢后的氢浓度分布。通过甘油气体收集试验、静态充氢拉伸试验、扫描电子显微镜（SEM）试验和显微硬度试验，研究了1mm厚试样中的扩散氢含量及其对材料力学性能的影响。结果表明，当充氢时间达到48h时，扩散氢含量趋于饱和状态。模拟结果表明，ABAQUS能够有效地模拟氢浓度分布，该方法可用于分析具有复杂结构或包含多种微观结构的材料中的氢浓度。氢对力学性能的影响是，该材料的伸长率降低，扩散氢会导致材料的断裂韧性下降，从而发生氢脆（HE）。此外，由于吸氢，杨氏模量E和显微硬度增加，其变化值与引入试样中的氢浓度有关。

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本文引用的文献

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Observation of hydrogen trapping at dislocations, grain boundaries, and precipitates.观察氢在位错、晶界和析出物处的捕获。
Science. 2020 Jan 10;367(6474):171-175. doi: 10.1126/science.aaz0122.
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Self-Healing in Carbon Nitride Evidenced As Material Inflation and Superlubric Behavior.碳氮化物自修复现象表现为材料的膨胀和超润滑行为。
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Experimental Investigation of the Effect of Hydrogen on Fracture Toughness of 2.25Cr-1Mo-0.25V Steel and Welds after Annealing.
氢气对2.25Cr-1Mo-0.25V钢及其退火后焊缝断裂韧性影响的实验研究。
Materials (Basel). 2018 Mar 27;11(4):499. doi: 10.3390/ma11040499.
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