China
Africa
Explore chapters and articles related to this topic
Fundamentals of Electrochemistry
Published in Héctor A. Videla, Manual of Biocorrosion, 2018
Hydrogen damage is a general term which refers to the mechanical damage of a metal caused by the presence of hydrogen or by its interaction. Hydrogen damage may be classified into four distinct types: Hydrogen blisteringHydrogen embrittlementDecarburizationHydrogen attack
The impact of hydrogen on mechanical performance of carbon alloy plates detected by eddy current method
Published in Nondestructive Testing and Evaluation, 2023
Haiting Zhou, Huandong Huang, Dongdong Ye, Qiang Wang, Chenxi Zhu
The mechanical property parameters obtained by destructive testing methods such as impact and tensile tests are usually used to quantitatively characterise the performance degradation state of materials [14]. The application of non-destructive testing technology to detect the early hydrogen damage state of materials is a hot spot in developing safety testing and characterisation in the hydrogen energy industry. Eddy current testing has unique advantages of non-contact, simplicity, stability, and high reliability in a wide temperature range [15]. Some studies have shown that the eddy current response signal is sensitive to the hydrogen content in the material, and is expected to be used to evaluate hydrogen content or microstructural changes in early hydrogen damage states [16,17].
Investigation of carbide precipitates as hydrogen traps and their role in hydrogen embrittlement susceptibility of twinning-induced plasticity steel
Published in Corrosion Engineering, Science and Technology, 2022
Hongxia Wan, Yong Cai, Bo Zhao, Changfeng Chen
The adsorption behaviour of hydrogen in the intragranular carbides was measured by SKPFM to characterise whether intragranular carbides were hydrogen traps (Figure 10). The potential of carbides in the grain was approximately 80 mV (Figure 10(b)), which was equal to the potential of carbides in Figure 10(d). The same carbides were observed because the test condition was the same. The CPD between Cr/Mo carbides in the grain and austenite matrix was approximately 100 mV before hydrogen charging. The morphology of carbides underwent extremely small changes (Figures 10(a,c)) after hydrogen charging due to ion thinning. Ion thinning did not affect the potential of the material. However, the CPD became 40 mV (Figure 10(d)). The difference in the CPD was approximately 60 mV before and after hydrogen charging. The carbides in the grain were also hydrogen traps. Interestingly, the CPD between Cr/Mo carbides at the grain boundary and the austenite matrix was approximately 77 mV. This finding indicated that Cr/Mo carbides at the grain boundary had a stronger ability for hydrogen absorption than carbides in the grain because the grain boundary acted as a fast channel for hydrogen diffusion. Hence, carbides at the grain boundaries adsorbed more hydrogen than carbides inside grains. Trap sites at the grain boundaries can induce a much higher slope of the potential than only grain boundaries [31]. Both carbides at the grain boundary and inside grains are hydrogen trap sites [32–34]. Considering that the carbides preferentially precipitate at the grain boundary, hydrogen-induced cracking easily results in intergranular cracking. Hydrogen traps have an important effect on the solubility of hydrogen, hydrogen diffusion, hydrogen damage and hydrogen-induced cracking. Therefore, controlling the quantity and distribution of traps is an important way to improve the resistance of materials to hydrogen damage and hydrogen-induced cracking.