Modeling fatigue life and hydrogen embrittlement of bcc steel with unified mechanics theory

Lee, Hsiao Wei; Djukic, Milos B.; Basaran, Cemal

doi:10.1016/j.ijhydene.2023.02.110

Cited by 22 publications

(10 citation statements)

References 125 publications

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“…In previous studies on HE, the microscopic characteristics of quasi cleavage and brittle inter-granular fracture were often explained by hydrogen-enhanced decohesion (HEDE), while the ductile microporous aggregation fracture mode was explained by the synergistic effect of plastic mediated HELP mechanism [34]. These comprehensive HE characteristics have been observed in different grades of steel, including TRIP steel [35][36][37][38][39]. In this experiment, after yielding Q&P980 multiphase steel, the TRIP effect occurs in granulated austenite, forming brittle twin martensite and inducing hydrogen-induced crack nucleation at the interface of retained austenite, martensite and ferrite (as shown in figure 7).…”

Section: Discussionmentioning

confidence: 98%

Effect of hydrogen charging intensities and times on hydrogen embrittlement of Q&P980 steel

Zhao,

Chen,

Zhang

et al. 2024

Mater. Res. Express

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Q&P steel has good development prospects because of its excellent mechanical properties, but with the improvement in strength grade, hydrogen-induced delayed fracture (HIDF) is almost inevitable. In this paper, slow strain rate tensile tests and deep-drawn cup tests of Q&P980 steel under different hydrogen charging strengths and times were carried out, and the microstructure and fracture morphology were analysed by SEM. The results show that the plastic loss of Q&P980 steel was more obvious with increasing hydrogen charging intensity and hydrogen charging time, and a good elongation of 6.63% is still retained under the hydrogen content of 2.134 ppm. The deep-drawn cup samples were placed in acidic distilled water and alkaline and acidic solutions, and only a deep-drawn ratio of 1.9 showed HIDF in the three solutions. Specifically, 12 cracks were observed after soaking in HCl solution for two days. The main reason is that the martensite, austenite island and ferrite phase interface of Q&P980 steel increase stress during deformation and with the transformation-induced plasticity (TRIP) effect, resulting in hydrogen segregation at the phase interface and crack initiation leading to HIDF.

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Section: Discussionmentioning

confidence: 98%

Effect of hydrogen charging intensities and times on hydrogen embrittlement of Q&P980 steel

Zhao,

Chen,

Zhang

et al. 2024

Mater. Res. Express

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“…467 The phase field model provides a versatile means to simulate crack progression and plasticity, applied to both HEDE and HELP mechanisms. 687,714 The unified mechanics theory, recently extended with H considerations, offers a way to quantify material degradation by considering entropy production due to the effects of H on micro-plasticity and decohesion, 718 which is in line with the concept of synergistic action of HEDE and HELP mechanisms. Moreover, voidbased predictive models, including unit cell and Gurson-type models, link plasticity, material separation, and vacancies and stand out as a platform to incorporate several major HE mechanisms, i.e., HELP, HEDE, and HESIV mechanisms.…”

Section: Multiscale and Predictive Modelingmentioning

confidence: 99%

“…The Gurson model was calibrated using the unit cell approach with J2 plasticity theory and a linear H softening function. A simplified approach to modeling the combined effect of HELP and HEDE is to run a H-accelerated ductile damage model and a H-weakened cleavage fracture model at the same time, and take whichever that occurs earlier as the actual failure. , Recently, Lee et al , implemented the synergistic action of HELP and HEDE in steel based on the so-called unified mechanics theory. The theory quantifies material degradation by the total specific entropy production rate.…”

Section: Knowledge Base About Hementioning

confidence: 99%

“…The weakest-link statistical model has been effective in describing decohesion at GB carbides, taking into account the local stress and H accumulation associated with dislocation pile-ups, and aligning with plasticity-mediated decohesion . The phase field model provides a versatile means to simulate crack progression and plasticity, applied to both HEDE and HELP mechanisms. , The unified mechanics theory, recently extended with H considerations, offers a way to quantify material degradation by considering entropy production due to the effects of H on micro-plasticity and decohesion, which is in line with the concept of synergistic action of HEDE and HELP mechanisms. Moreover, void-based predictive models, including unit cell and Gurson-type models, link plasticity, material separation, and vacancies and stand out as a platform to incorporate several major HE mechanisms, i.e., HELP, HEDE, and HESIV mechanisms. ,,, It is noted that these models represent a promising but not exhaustive list.…”

Section: Closing Remarksmentioning

confidence: 99%

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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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“…In recent years, scholars have proposed some novel theoretical models for fatigue life prediction [ 30 , 31 ]. Although theoretical models can yield accurate solutions provided that accurate models can be built, it is difficult for structures under complex loads.…”

Section: Introductionmentioning

confidence: 99%

Multiaxial Fatigue Analysis of Connecting Bolt at High-Speed Train Axle Box under Structural Subharmonic Resonance

Feng,

Li,

Shu

et al. 2023

Sensors

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Based on the dynamic characteristics of the axle box front cover of high-speed trains in the subharmonic resonance state, the nonlinear single-degree-of-freedom (SDOF) model was proved to be reasonable, and reasons for the ineffectiveness of the common prevention methods for preventing bolt failure were analyzed firstly. Then, dynamic stress of the bolt was simulated by innovatively adopting the linear method based on frequency response analysis. The stress simulation method was verified to be practical under the subharmonic resonance state by analyzing and comparing the experimental and numerical results of the bolted front cover. It was proved that the linear method was accurate enough to simulate the dynamic stress of bolts, which is of great engineering significance. In addition to the transverse resonance stress of bolts caused by drastic vertical vibration of the front cover, the tensile resonance stress at the root of the first engaged thread was too large to be neglected on account of the first-order bending modes of bolts. Next, equivalent stress amplitude of the multiaxial stresses was obtained by means of the octahedral shear stress criterion. Finally, fatigue life of bolts was predicted in terms of S-N curve suitable for bolt fatigue life analysis. It argued that the bolts were prone to multiaxial fatigue failure when the front cover was in subharmonic resonance for more than 26.8 h, and the fatigue life of bolts could be greatly improved when the wheel polygonization was eliminated by shortening the wheel reprofiling interval.

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Modeling fatigue life and hydrogen embrittlement of bcc steel with unified mechanics theory

Cited by 22 publications

References 125 publications

Effect of hydrogen charging intensities and times on hydrogen embrittlement of Q&P980 steel

Effect of hydrogen charging intensities and times on hydrogen embrittlement of Q&P980 steel

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

Multiaxial Fatigue Analysis of Connecting Bolt at High-Speed Train Axle Box under Structural Subharmonic Resonance

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