SPT analysis of hydrogen embrittlement in CrMoV welds

Álvarez, G.; Zafra, A.; Rodríguez, Celestino; Belzunce, F. J.; Cuesta, I.I.

doi:10.1016/j.tafmec.2020.102813

Cited by 11 publications

(2 citation statements)

References 27 publications

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“…In these areas, the coarse-grained region developed next to the fusion line usually shows the most brittle behavior. It is therefore obvious that the fatigue crack growth rate of welded steels containing internal hydrogen should be measured considering this particular microstructure [27]. The main problem is the small width of this region (only a few millimeters), which implies the need for heat treatments able to reproduce this particular microstructure in a volume of material large enough to obtain the standardized specimens necessary to perform the corresponding tests.…”

Section: Introductionmentioning

confidence: 99%

Effect of Internal Hydrogen on the Fatigue Crack Growth Rate in the Coarse-Grain Heat-Affected Zone of a CrMo Steel

Álvarez

Zafra

Belzunce

et al. 2022

Metals

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The effect of internal hydrogen in the fatigue crack growth rate of the coarse grain region of a 2.25Cr1Mo steel welded joint was analyzed in this work. The microstructure of the coarse grain region was simulated by means of a heat treatment able to provide the same microstructure with a similar prior austenite grain size and hardness to the one in a real welded joint. The fatigue crack growth rate was measured under standard laboratory conditions using compact tensile (CT) specimens that were (i) uncharged and hydrogen pre-charged in a hydrogen pressure reactor (under 19.5 MPa and 450 °C for 21 h). The influence of fatigue frequency was assessed using frequencies of 10 Hz, 0.1 Hz, and 0.05 Hz. Additionally, two load ratios (R = 0.1 and R = 0.5) were applied to analyze their influence in the da/dN vs. ∆K curves and therefore in the fatigue crack growth rate. The embrittlement produced by the presence of internal hydrogen was clearly noticed at the beginning of the fatigue crack growth rate test (ΔK = 30 MPm), obtaining significant higher values than without hydrogen. This effect became more notorious as the test frequency decreased and the load ratio increased. At the same time, the failure mechanism changed from ductile (striations) to brittle (hydrogen decohesion) with intergranular fracture (IG) becoming the predominant failure mechanism under the highest loads (R = 0.5).

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Section: Introductionmentioning

confidence: 99%

Effect of Internal Hydrogen on the Fatigue Crack Growth Rate in the Coarse-Grain Heat-Affected Zone of a CrMo Steel

Álvarez

Zafra

Belzunce

et al. 2022

Metals

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“…748,822 The small punch test (SPT), which is commonly used as a screening tool for nuclear materials, requires a simple procedure to test miniature specimens, 10 × 10 × 0.5 mm 3 approximately, and it has been recently standardized (ASTM E3205-20 or BS EN 10371:2021) for metallic materials. The application of SPT to the study of HE has been considered for pre-charged specimens, 823 electrochemical in situ testing, 824,825 or even with gaseous in situ setups. 826,827 An illustration of the SPT setup is shown in Figure 52, where the loading similarities with the disk pressure test can be appreciated.…”

Section: Chemical Reviewsmentioning

confidence: 99%

Hydrogen Embrittlement as a Conspicuous Material Challenge─Comprehensive Review and Future Directions

Yu,

Díaz,

et al. 2024

Chem. Rev.

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Hydrogen is considered a clean and efficient energy carrier crucial for shaping the net-zero future. Large-scale production, transportation, storage, and use of green hydrogen are expected to be undertaken in the coming decades. As the smallest element in the universe, however, hydrogen can adsorb on, diffuse into, and interact with many metallic materials, degrading their mechanical properties. This multifaceted phenomenon is generically categorized as hydrogen embrittlement (HE). HE is one of the most complex material problems that arises as an outcome of the intricate interplay across specific spatial and temporal scales between the mechanical driving force and the material resistance fingerprinted by the microstructures and subsequently weakened by the presence of hydrogen. Based on recent developments in the field as well as our collective understanding, this Review is devoted to treating HE as a whole and providing a constructive and systematic discussion on hydrogen entry, diffusion, trapping, hydrogen–microstructure interaction mechanisms, and consequences of HE in steels, nickel alloys, and aluminum alloys used for energy transport and storage. HE in emerging material systems, such as high entropy alloys and additively manufactured materials, is also discussed. Priority has been particularly given to these less understood aspects. Combining perspectives of materials chemistry, materials science, mechanics, and artificial intelligence, this Review aspires to present a comprehensive and impartial viewpoint on the existing knowledge and conclude with our forecasts of various paths forward meant to fuel the exploration of future research regarding hydrogen-induced material challenges.

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Estimation of Local Mechanical Properties by Small Punch Test in Welded Joints of Maraging C250 Steel

Svoboda,

Duran,

Belzunce

et al. 2024

J. of Materi Eng and Perform

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SPT analysis of hydrogen embrittlement in CrMoV welds

Cited by 11 publications

References 27 publications

Effect of Internal Hydrogen on the Fatigue Crack Growth Rate in the Coarse-Grain Heat-Affected Zone of a CrMo Steel

Effect of Internal Hydrogen on the Fatigue Crack Growth Rate in the Coarse-Grain Heat-Affected Zone of a CrMo Steel

Hydrogen Embrittlement as a Conspicuous Material Challenge─Comprehensive Review and Future Directions

Estimation of Local Mechanical Properties by Small Punch Test in Welded Joints of Maraging C250 Steel

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