Effects of local stress, strain, and hydrogen content on hydrogen-related fracture behavior in low-carbon martensitic steel

Shibata, Akinobu; Yonemura, Takashi; Momotani, Yuji; Park, Myeong-heom; Takagi, Shusaku; Madi, Yazid; Besson, Jacques; Tsuji, Nobuhiro

doi:10.1016/j.actamat.2021.116828

Cited by 58 publications

(15 citation statements)

References 41 publications

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“…Takeda and McMahon reported that quasi-cleavage fractures corresponded to strain-controlled fractures [3]. Based on finite element simulation, we also demonstrated that the plastic strains were maximized at the quasi-cleavage crack initiation sites [22]. Because the higher applied stress promotes plastic deformation, the increase in quasi-cleavage fractures were observed as the applied stress increased (Figure 6b), which is consistent with previous studies.…”

Section: Discussionsupporting

confidence: 91%

“…Because the formation of micro-cracks can be regarded as the initial stage of fracture, the results indicate that the initiation site of the hydrogen-related fracture was prior austenite grain boundaries and did not change with the applied stress. Previous studies also reported that hydrogen-related cracks were initiated around prior austenite grain boundaries [7,22]. We confirmed that the fracture surfaces consisted of intergranular surfaces, quasicleavage surfaces, and ductile surfaces with dimple patterns, regardless of testing type (constant loading tensile test or slow strain rate tensile test), applied stress, and HD.…”

Section: Resultssupporting

confidence: 85%

“…Because the formation of micro-cracks can be regarded as the initial stage of fracture, the results indicate that the initiation site of the hydrogen-related fracture was prior austenite grain boundaries and did not change with the applied stress. Previous studies also reported that hydrogen-related cracks were initiated around prior austenite grain boundaries [7,22]. The hydrogen-related fracture propagation process in the specimen with HD = 0.80 wt.…”

Section: Resultsmentioning

confidence: 59%

“…Wang et al [21] studied the condition of hydrogen-related fracture using notched specimens with different notch root radii and proposed that the local stress field (maximum principal stress) and local hydrogen content controlled the intergranular fracture. Recently, we also revealed that the stress level and hydrogen content at the initiation sites of intergranular cracks were almost the same, regardless of the stress concentration factor of the notched specimens [22].…”

Section: Introductionmentioning

confidence: 77%

“…Because the mode of hydrogen-related fracture did not change significantly with H D (Figure 6b), we propose that the fracture mode in hydrogen embrittlement is controlled by fracture stress and not by global H D inside the specimen. We previously studied hydrogen-related fracture behavior using double-notched tensile test specimens with different stress concentration factors, and we showed that the intergranular cracks were initiated under almost the same local stress field and local hydrogen concentration, despite the stress concentration factors being different [22]. Therefore, the critical local hydrogen concentration for the initiation of hydrogen-related intergranular cracks can be simplified as a function of the applied stress.…”

Section: Discussionmentioning

confidence: 99%

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Hydrogen-Related Fracture Behavior under Constant Loading Tensile Test in As-Quenched Low-Carbon Martensitic Steel

Shibata

Takeda

Kimura

et al. 2022

Metals

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This study investigated the hydrogen-related fracture behavior in as-quenched low-carbon martensitic steel under a constant loading tensile test with various applied stresses. We found that the fracture time in the constant loading tensile test decreased as the applied stress and hydrogen content increased. The fracture surface topography analysis revealed that when the applied stress was low, the intergranular fracture was initiated around the side surface of the specimen and gradually propagated into the inner part of the specimen. In contrast, several intergranular fractures were separately initiated inside the specimen when the applied stress was high. The mode of hydrogen-related fracture was controlled by the fracture stress and not by the global hydrogen content inside the specimen. Increasing the global hydrogen content caused a decrease in the duration required for the accumulation of critical local hydrogen concentration at the fracture initiation site (prior austenite grain boundary). Accordingly, we propose that the local state at the crack initiation site is constant under a given applied stress, even when the global hydrogen content is different.

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Section: Discussionsupporting

confidence: 91%

Section: Resultssupporting

confidence: 85%

“…Because the formation of micro-cracks can be regarded as the initial stage of fracture, the results indicate that the initiation site of the hydrogen-related fracture was prior austenite grain boundaries and did not change with the applied stress. Previous studies also reported that hydrogen-related cracks were initiated around prior austenite grain boundaries [7,22]. The hydrogen-related fracture propagation process in the specimen with HD = 0.80 wt.…”

Section: Resultsmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Hydrogen-Related Fracture Behavior under Constant Loading Tensile Test in As-Quenched Low-Carbon Martensitic Steel

Shibata

Takeda

Kimura

et al. 2022

Metals

Self Cite

View full text Add to dashboard Cite

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Hydrogen Embrittlement Evaluation and Prediction in Press‐Hardened Steels

Cao

Wang

Ngiam

et al. 2023

steel research int.

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The application of press-hardened steels (PHSs) in automotive body-in-white components using the hot-stamping technique is growing thanks to its impressive strength and formability. Unfortunately, hydrogen embrittlement (HE), an issue that generally exists in high-strength steels, impedes the PHSs rising application trend by causing catastrophic mechanical property degradation. Thus, detailed evaluation and prediction of HE risk throughout PHSs manufacture and service condition are necessary. This study highlights techniques to characterize the hydrogen content and distribution, techniques to evaluate HE susceptibility, and potential models to simulate the in-service performance of PHS. The survey of existing studies has revealed the gaps between laboratory measurement and industry application, including but not limited to 1) the accelerated experiment-induced discrepancies against real-life applications, 2) a selection of the appropriate HE indicators, 3) an accurate risk prediction model, and 4) efficient feedback to the industry based on both experimental and simulated results. Based on the review, future studies are expected to establish a conclusive HE evaluation standard for PHS.

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Experimental and Fractographic Study of the Hydrogen‐Induced Cracking of 45CrNiMoVA Martensitic Advanced High‐Strength Steel

Li,

Liu

2024

steel research int.

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Hydrogen‐induced cracking (HIC) in high‐strength 45CrNiMoVA steel is investigated using smooth and notched cylindrical specimens by performing uniaxial tensile tests. Specimens with different notch geometries are used to analyze the interacting effects of the stress concentration factor and HIC micromechanism. The results show that hydrogen charging reduces the elongation at fracture and the ultimate tensile strength of smooth tensile specimens. The microscopic fracture mode changes from ductile dimples with some quasicleavage fracture without hydrogen to a mixture of brittle quasicleavage and intergranular cracking with hydrogen. For notched specimens with a lower notch root radius, significant stress concentration occurs at the notch root, which enriches hydrogen in these highly stressed regions. This causes a lower notch tensile strength and greater susceptibility to hydrogen embrittlement. Microfracture observations show that the area fraction of the intergranular cracking surface increases gradually, and the brittle zone moves farther away from the notch root upon decreasing the notch root radius, causing the embrittlement index to remain high. These results will help determine the applicability of existing steel for hydrogen service and also provide guidance for developing new high‐strength martensitic steels that can resist hydrogen embrittlement.

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Effects of local stress, strain, and hydrogen content on hydrogen-related fracture behavior in low-carbon martensitic steel

Cited by 58 publications

References 41 publications

Hydrogen-Related Fracture Behavior under Constant Loading Tensile Test in As-Quenched Low-Carbon Martensitic Steel

Hydrogen-Related Fracture Behavior under Constant Loading Tensile Test in As-Quenched Low-Carbon Martensitic Steel

Hydrogen Embrittlement Evaluation and Prediction in Press‐Hardened Steels

Experimental and Fractographic Study of the Hydrogen‐Induced Cracking of 45CrNiMoVA Martensitic Advanced High‐Strength Steel

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