Effects of solid solution and grain-boundary segregation of Mo on hydrogen embrittlement in 32MnB5 hot-stamping steels

Yoo, Jisung; Jo, Min Chul; Jo, Min Cheol; Kim, Seongwoo; Kim, Sang Heon; Oh, Jinkeun; Sohn, Seok Su; Lee, Sunghak

doi:10.1016/j.actamat.2021.116661

Cited by 51 publications

(24 citation statements)

References 85 publications

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“…This was attributed to the reduction of H diffusivity by Mo [155]. Besides, Mo was also reported to enhance GB cohesive strength and reduce strain localisation along austenite RHAGBs leading to a transition in crack propagation from intergranular to transgranular mode [155]. In the context of Fe-1.62Mn-0.18Si (wt.%) ferritic steel, segregation of P (at ferrite RHAGBs) has been reported to drastically reduce GB cohesive strength [111].…”

Section: Proposed Model Main Feature (Or Assumption) Referencementioning

confidence: 99%

“…[153], [154]. Yoo et al [155] have reported that addition of 0.15 at.% Mo leads to an improvement in HE resistance in a 32MnB5 hot-stamping steel. This was attributed to the reduction of H diffusivity by Mo [155].…”

Section: Proposed Model Main Feature (Or Assumption) Referencementioning

confidence: 99%

“…Yoo et al [155] have reported that addition of 0.15 at.% Mo leads to an improvement in HE resistance in a 32MnB5 hot-stamping steel. This was attributed to the reduction of H diffusivity by Mo [155]. Besides, Mo was also reported to enhance GB cohesive strength and reduce strain localisation along austenite RHAGBs leading to a transition in crack propagation from intergranular to transgranular mode [155].…”

Section: Proposed Model Main Feature (Or Assumption) Referencementioning

confidence: 99%

See 2 more Smart Citations

Grain Boundary Segregation In Steels: Towards Engineering The Design Of Internal Interfaces<strong> </strong>

Saha¹

2022

Preprint

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Solute decoration at grain boundaries (GB) leads to a number of phenomenon such as changes in interface structure, mobility, cohesion etc. Recent experimental investigations on interfacial segregation in steels are based on microstructural characterisation using two correlative methodologies, namely, Transmission Electron Microscopy-Atom Probe Tomography (APT) and Electron Backscatter Diffraction-APT. Considering the growing interest in this avenue, the present review is aimed at addressing the common adsorption isotherms used for quantifying interfacial segregation and providing an overview of the present state of experimental research in the area of GB segregation in steels. The areas where an understanding of GB segregation may be utilised have also been highlighted with a focus on the experimental challenges associated with understanding GB segregation in steels.

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Section: Proposed Model Main Feature (Or Assumption) Referencementioning

confidence: 99%

Section: Proposed Model Main Feature (Or Assumption) Referencementioning

confidence: 99%

Section: Proposed Model Main Feature (Or Assumption) Referencementioning

confidence: 99%

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Grain Boundary Segregation In Steels: Towards Engineering The Design Of Internal Interfaces<strong> </strong>

Saha¹

2022

Preprint

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“…[81] Similarly, the 0.15 wt% Mo addition to a reference 1.9 GPa-grade PHS results in a diffusivity decrease from 14.2 Â 10 À11 to 6.33 Â 10 À11 mm 2 s À1 . [100] Further quantitative analysis on the hydrogen solubility, permeability, density of trapping sites, and respective trapping energies could be carried out with varying test conditions and microstructure characterizations. [33,51,101] The HPT is highly sensitive to the test conditions (such as temperature, charging electrolyte, and charging current) and thus is recommended when exploring a novel material to identify the most suitable test condition.…”

Section: Hydrogen Permeation Techniquementioning

confidence: 99%

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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“…Hot-stamping steel is a type of ultrahigh-strength steel that is specially designed for the production of high-strength and high-plasticity components, and it possesses excellent thermal plasticity, workability, and formability [1][2][3][4][5][6]. Due to its exceptional forming performance, hot-stamping steel can be plastically deformed at high temperatures, resulting in precise product shapes and sizes.…”

Section: Introductionmentioning

confidence: 99%

Study on Corrosion Behavior and Mechanism of Ultrahigh-Strength Hot-Stamping Steel Based on Traditional and Compact Strip-Production Processes

Chen

Wang

et al. 2023

Materials

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Hot-stamping steel is a type of high-strength steel that is mainly used in key safety components such as the front and rear bumpers, A-pillars, and B-pillars of vehicles. There are two methods of producing hot-stamping steel, i.e., the traditional process and the near net shape of compact strip production (CSP) process. To assess the potential risks of producing hot-stamping steel using CSP, the microstructure and mechanical properties, and especially the corrosion behavior were focused on between the traditional and CSP processes. The original microstructure of hot-stamping steel produced by the traditional process and the CSP process is different. After quenching, the microstructures transform into full martensite, and their mechanical properties meet the 1500 MPa grade. Corrosion tests showed that the faster the quenching speeds, the smaller the corrosion rate of the steel. The corrosion current density changes from 15 to 8.6 μA·cm−2. The corrosion resistance of hot-stamping steel produced by the CSP process is slightly better than that of traditional processes, mainly since the inclusion size and distribution density of CSP-produced steel were both smaller than those of the traditional process. The reduction of inclusions reduces the number of corrosion sites and improves the corrosion resistance of steel.

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Effects of solid solution and grain-boundary segregation of Mo on hydrogen embrittlement in 32MnB5 hot-stamping steels

Cited by 51 publications

References 85 publications

Grain Boundary Segregation In Steels: Towards Engineering The Design Of Internal Interfaces<strong> </strong>

Grain Boundary Segregation In Steels: Towards Engineering The Design Of Internal Interfaces<strong> </strong>

Hydrogen Embrittlement Evaluation and Prediction in Press‐Hardened Steels

Study on Corrosion Behavior and Mechanism of Ultrahigh-Strength Hot-Stamping Steel Based on Traditional and Compact Strip-Production Processes

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