Slow strain rate tensile test results of new multiphase 17%Cr stainless steel under hydrogen cathodic charging

Tavares, Sérgio Souto Maior; Bastos, Ivan Napoleão; Pardal, Juan Manuel; Montenegro, T.R.; Silva, Manoel Ribeiro da

doi:10.1016/j.ijhydene.2015.05.148

Cited by 14 publications

(10 citation statements)

References 20 publications

(18 reference statements)

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“…The introduction of hydrogen in the manufacturing and operating processes causes a degradation in the mechanical properties of alloy steel and can easily lead to fracture failure [ 4 , 5 ]. Since hydrogenation reactors are exposed to an aggressive hydrogen environment, HE is a critical issue that diminishes the reliability of these methods [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Effect of Hydrogen on Fracture Toughness of 2.25Cr-1Mo-0.25V Steel and Welds after Annealing

Song

Chai

et al. 2018

Materials

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Hydrogen embrittlement (HE) is a critical issue that hinders the reliability of hydrogenation reactors. Hence, it is of great significance to investigate the effect of hydrogen on fracture toughness of 2.25Cr-1Mo-0.25V steel and weld. In this work, the fracture behavior of 2.25Cr-1Mo-0.25V steel and welds was studied by three-point bending tests under hydrogen-free and hydrogen-charged conditions. The immersion charging method was employed to pre-charge hydrogen inside specimen and the fracture toughness of these joints was evaluated quantitatively. The microstructure and grain size of the specimens were observed by scanning electron microscopy (SEM) and by metallurgical microscopy to investigate the HE mechanisms. It was found that fracture toughness for both the base metal (BM) and the weld zone (WZ) significantly decreased under hydrogen-charged conditions due to the coexistence of the hydrogen-enhanced decohesion (HEDE) and hydrogen-enhanced localized plasticity (HELP) mechanisms. Moreover, the formation and growth of primary voids were observed in the BM, leading to a superior fracture toughness. In addition, the BM compared to the WZ shows superior resistance to HE because the finer grain size in the BM leads to a larger grain boundary area, thus distributing more of the diffusive hydrogen trapped in the grain boundary and reducing the hydrogen content.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Effect of Hydrogen on Fracture Toughness of 2.25Cr-1Mo-0.25V Steel and Welds after Annealing

Song

Chai

et al. 2018

Materials

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“…In general, hydrogen storage vessels suffer a severe hydrogen environment with high pressure during the operating process. This may introduce hydrogen into the alloy steel, leading to a decrease in its mechanical properties, and this phenomenon is called hydrogen embrittlement (HE) [ 3 ]. This is considered to be one of the most critical issues that hinders the reliability of hydrogen storage vessels and causes fracture failure.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Influence of Pre-Charged Hydrogen on Fracture Toughness of As-Received 2.25Cr1Mo0.25V Steel and Weld

et al. 2018

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Fracture failure caused by hydrogen embrittlement (HE) is a major concern for the system reliability and safety of hydrogen storage vessels, which are generally made of 2.25Cr1Mo0.25V steel. Thus, study of the influence of pre-charged hydrogen on fracture toughness of as-received 2.25Cr1Mo0.25V steel and weld is of significant importance. In the current work, the influence of hydrogen on fracture toughness of as-received 2.25Cr1Mo0.25V steel and weld was systematically studied. Base metal (BM) and weld metal (WM) specimens under both hydrogen-free and hydrogen-charged conditions were tested using three-point bending tests. Hydrogen was pre-charged inside specimens by the immersion charging method. The J-integral values were calculated for quantitatively evaluating the fracture toughness. In order to investigate the HE mechanisms, optical microscopy (OM) and scanning electron microscopy (SEM) were used to characterize the microstructure of BM and WM specimens. The results revealed that the presence of pre-charged hydrogen caused a significant decrease of the fracture toughness for both BM and WM specimens. Moreover, the pre-charged hydrogen led to a remarkable transition of fracture mode from ductile to brittle pattern in 2.25Cr1Mo0.25V steel.

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“…85 μm above the SIMS images. (2020) 10:3611 | https://doi.org/10.1038/s41598-020-60370-2 www.nature.com/scientificreports www.nature.com/scientificreports/ For instance Tavares et al claimed that typical features of the decohesion are (quasi-)cleavage and intergranular fracture 40 . This becomes obvious in the micrograph in Fig.…”

Section: Resultsmentioning

confidence: 99%

In-situ ToF-SIMS analyses of deuterium re-distribution in austenitic steel AISI 304L under mechanical load

Röhsler

Sobol

Hänninen

et al. 2020

Sci Rep

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Hydrocarbons fuel our economy. furthermore, intermediate goods and consumer products are often hydrocarbon-based. Beside all the progress they made possible, hydrogen-containing substances can have severe detrimental effects on materials exposed to them. Hydrogen-assisted failure of iron alloys has been recognised more than a century ago. the present study aims to providing further insight into the degradation of the austenitic stainless steel AISI 304L (EN 1.4307) exposed to hydrogen. To this end, samples were electrochemically charged with the hydrogen isotope deuterium (2 H, D) and analysed by scanning electron microscopy (SEM), electron back-scatter diffraction (EBSD) and timeof-flight secondary ion mass spectrometry (ToF-SIMS). It was found that deuterium caused a phase transformation from the original γ austenite into εand α'-martensite. Despite their low solubility for hydrogen, viz. deuterium, the newly formed phases showed high deuterium concentration which was attributed to the increased density of traps. information about the behaviour of deuterium in the material subjected to external mechanical load was gathered. A four-point-bending device was developed for this purpose. this allowed to analyse in-situ pre-charged samples in the tof-SiMS during the application of external mechanical load. The results indicate a movement of deuterium towards the regions of highest stress. Researchers already warned against climate change in the 1970s, but only the "special report on the impacts of global warming of 1.5 ° C above pre-industrial levels", published by the Intergovernmental Panel on Climate Change (IPCC) together with massive civic engagement, brought this topic back to the agendas of policymakers 1,2. Man-made global warming ultimately causes extinction of species, desertification, poverty and migration and its ramifications will affect mankind as a whole. Taking action to reduce emissions of greenhouse gases in sectors such as energy production, transportation, mobility and industry are now more important than ever. Among other measures, the transition towards renewable energy sources like wind and solar power is necessary and inevitable to mitigate the emission of greenhouse gases. However, these technologies face us with the problem of storing the generated electricity. Converting electrical energy into chemical energy through the formation of hydrogen and methane is a suitable way for this purpose. These gases can be stored, transported and used to regenerate electrical energy. Establishing a reliable infrastructure for this power-togas grid requires further investigation in every aspect of the chain, from conversion efficiency to safety of components such as pipelines exposed to high concentrations of hydrogen. This is necessary because the suitability of materials used for this hydrogen-infrastructure is still not fully clarified 3. Moreover, hydrogen-induced degradation of such components can cause high economic and environmental costs 4. Hydrogen-assisted damages of steels already used in the fo...

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Slow strain rate tensile test results of new multiphase 17%Cr stainless steel under hydrogen cathodic charging

Cited by 14 publications

References 20 publications

Experimental Investigation of the Effect of Hydrogen on Fracture Toughness of 2.25Cr-1Mo-0.25V Steel and Welds after Annealing

Experimental Investigation of the Effect of Hydrogen on Fracture Toughness of 2.25Cr-1Mo-0.25V Steel and Welds after Annealing

Investigation of the Influence of Pre-Charged Hydrogen on Fracture Toughness of As-Received 2.25Cr1Mo0.25V Steel and Weld

In-situ ToF-SIMS analyses of deuterium re-distribution in austenitic steel AISI 304L under mechanical load

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