Heuristic Design of Advanced Martensitic Steels That Are Highly Resistant to Hydrogen Embrittlement by ε-Carbide

Shimotomai, M.

doi:10.3390/met11020370

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…Hydrogen atoms penetrate into the interior of steel which can change the mechanical properties of steel, leading to the premature fracture of steel components. This phenomenon is called hydrogen embrittlement (HE) [1][2][3]. The degradation in metallic materials due to HE is a complex mechanism question which combines mechanical and physical-chemical standpoints.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen-Assisted Brittle Fracture Behavior of Low Alloy 30CrMo Steel Based on the Combination of Experimental and Numerical Analyses

Zhang

et al. 2021

Materials

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Compact-tension (CT) specimens made of low alloy 30CrMo steels were hydrogen-charged, and then subjected to the fracture toughness test. The experimental results revealed that the higher crack propagation and the lower crack growth resistance (CTOD-R curve) are significantly noticeable with increasing hydrogen embrittlement (HE) indexes. Moreover, the transition in the microstructural fracture mechanism from ductile (microvoid coalescence (MVC)) without hydrogen to a mixed quasi-cleavage (QC) fracture and QC + intergranular (IG) fracture with hydrogen was observed. The hydrogen-enhanced decohesion (HEDE) mechanism was characterized as the dominant HE mechanism. According to the experimental testing, the coupled problem of stress field and hydrogen diffusion field with cohesive zone stress analysis was employed to simulate hydrogen-assisted brittle fracture behavior by using ABAQUS software. The trapezoidal traction-separation law (TSL) was adopted, and the initial TSL parameters from the best fit to the load-displacement and J-integral experimental curves without hydrogen were calibrated for the critical separation of 0.0393 mm and the cohesive strength of 2100 MPa. The HEDE was implemented through hydrogen influence in the TSL, and to estimate the initial hydrogen concentration based on matching numerical and experimental load-line displacement curves with hydrogen. The simulation results show that the general trend of the computational CTOD-R curves corresponding to initial hydrogen concentration is almost the same as that obtained from the experimental data but in full agreement, the computational CTOD values being slightly higher. Comparative analysis of numerical and experimental results shows that the coupled model can provide design and prediction to calculate hydrogen-assisted fracture behavior prior to extensive laboratory testing, provided that the material properties and properly calibrated TSL parameters are known.

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Section: Introductionmentioning

confidence: 99%

Hydrogen-Assisted Brittle Fracture Behavior of Low Alloy 30CrMo Steel Based on the Combination of Experimental and Numerical Analyses

Zhang

et al. 2021

Materials

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“…Shimotomai [15] reports on advanced, tempered, martensitic steels. He shows how their mechanical strength is characterized by fine sub-grain structures with a high density of free dislocations and metallic carbides and/or nitrides.…”

Section: Contributionsmentioning

confidence: 99%

Heat Treatment of Steels

Schino

Testani

2021

Metals

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“…Then, hydrogen atoms will be induced by stress to diffuse and enrich at the crack tip or stress concentration points. Under the action of high hydrogen concentration and high stress, the cracks spread quickly, resulting in what is known as hydrogen embrittlement at the low load [ 1 , 2 , 3 , 4 , 5 ]. Hydrogen embrittlement is a common problem in high-end manufacturing, transportation, and new energy industries.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation for Hydrogen-Assisted Cracking: An Explicit Phase-Field Formulation

Wang

Chen

2023

Materials

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Hydrogen-assisted cracking is one of the most dominant failure modes in metal hydrogen-facing materials. Therefore, the hydrogen-assisted cracking mechanism has been a hot topic for a long time. To date, there is very little published research on numerical methods to describe hydrogen-assisted cracking. This paper presents a new method for the description of hydrogen embrittlement crack growth: an explicit phase-field formulation, which is based on the phase-field description of cracks, Fick’s mass diffusion law, and the relationship between hydrogen content and fracture surface energy. A novel computational framework is then developed using the self-developed FEM software DYNA-WD. We numerically calculate several typical conditions in the 3-D coordinates to validate the effectiveness of the proposed computational framework. Specifically, we discuss (i) the failure of a square plate in a hydrogenous environment, (ii) the CT specimen failed with the inner hydrogen, (iii) the plate /failed with the corrosives, and (iv) the failure of the disk test. Finally, the relationship between Mises stress, the concentration of hydrogen, the thickness of the disc, and the loading rate is investigated.

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Heuristic Design of Advanced Martensitic Steels That Are Highly Resistant to Hydrogen Embrittlement by ε-Carbide

Cited by 6 publications

References 24 publications

Hydrogen-Assisted Brittle Fracture Behavior of Low Alloy 30CrMo Steel Based on the Combination of Experimental and Numerical Analyses

Hydrogen-Assisted Brittle Fracture Behavior of Low Alloy 30CrMo Steel Based on the Combination of Experimental and Numerical Analyses

Heat Treatment of Steels

Numerical Simulation for Hydrogen-Assisted Cracking: An Explicit Phase-Field Formulation

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