Resistance of Hydrogen Embrittlement on Hot-Sheared Surface during Die-Quench Process

Matsuno, Takashi; Sekito, Yoshihito; Sakurada, Eisaku; Suzuki, Tamaki; Kawasaki, K.; Suehiro, Masayoshi

doi:10.2355/tetsutohagane.100.359

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…The solubility of hydrogen in bcc ferrite is very low and the diffusion rate is very high (Loidl et al , 2011; Michler and Naumann, 2010; Solheim and Solberg, 2013). Therefore, the ability of ferrite to improve the HE resistance of the 17-4PH stainless steel can be related to its ability to absorb part of plastic deformation work and reduce the stress concentration caused by martensitic transformation (Matsuno et al , 2014; Yang et al , 2018).…”

Section: Resultsmentioning

confidence: 99%

“…Zhao et al (2002) showed that acicular ferrite and ultrafine ferrite have good resistance to HE and good mechanical properties. Matsuno et al (2014) and Yang et al (2018) found that adding ferrite into high-strength steels can absorb part of the plastic deformation energy and reduce the stress concentration caused by martensitic transformation, thereby reducing the HE susceptibility. However, the microstructure refined by low-temperature annealing can trap more hydrogen atoms at the interface (Yang et al , 2018).…”

Section: Introductionmentioning

confidence: 99%

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Ferrite effects on the hydrogen embrittlement of 17-4PH stainless steel

Zheng

Sun

Yan

et al. 2022

ACMM

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Purpose The purpose of this study is to investigate the effect of ferrite on hydrogen embrittlement (HE) of the 17-4PH stainless steels. Design/methodology/approach The effects of ferrite on HE of the 17-4PH stainless steels were investigated by observing microstructure and conducting slow-strain-rate tensile tests and hydrogen permeability tests. Findings The microstructure of the ferrite-bearing sample is lath martensite and banded ferrite, and the ferrite-free sample is lath martensite. After hydrogen charging, the plasticity of the two steels is significantly reduced, along with the tensile strength of the ferrite-free sample. The HE susceptibility of the ferrite-bearing sample is significantly lower than the ferrite-free steel, and the primary fracture modes gradually evolved from typical dimple to quasi-cleavage and intergranular cracking. After aging at 480°C for 4 h and hydrogen charging for 12 h, the 40.9% HE susceptibility of ferrite-bearing samples was the lowest. In addition, the hydrogen permeation tests show that ferrite is a fast diffusion channel for hydrogen, and the ferrite-bearing samples have higher effective hydrogen diffusivity and lower hydrogen concentration. Originality/value There are a few studies of the ferrite effect on the HE properties of martensitic precipitation hardening stainless steel.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ferrite effects on the hydrogen embrittlement of 17-4PH stainless steel

Zheng

Sun

Yan

et al. 2022

ACMM

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show abstract

“…Matsuno et al used hot-stamped steel sheets to quantify the residual stress at the sheared edge using X-ray measurements to investigate the effect of cold and hot shearing on hydrogen embrittlement at the sheared edge 11) . In this study, the stress components in two directions were quantified: the thickness direction and the perpendicular direction.…”

Section: Introductionmentioning

confidence: 99%

Effect of Residual Stress on Hydrogen Embrittlement at Sheared Edge

et al. 2024

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The residual stresses at a circular punched end face in tempered martensitic high-strength steel sheets were investigated using triaxial stress analysis via X-ray diffraction. The maximum principal stress and its direction were calculated from the measured nine stress components. The relationship between the directions of the maximum principal stress and hydrogen cracks was verified by generating hydrogen cracks on the punched end face in the same specimen using cathodic hydrogen charging. The direction of the cracks was perpendicular to that of the maximum principal stress. This result indicates that hydrogen embrittlement at the sheared end face is caused by the maximum principal stress. Moreover, the distribution of the residual stresses toward the thickness direction and the relationship between residual stresses and tensile strength of the specimens were investigated. The maximum principal stress on the punch side was lower than that on the dice side.Unlike the maximum principal stresses, the normal stresses did not increase monotonically with the tensile strength of the specimens. Therefore, it was concluded that investigating the maximum principal stress at any area between the dice side and a line located midway from the end face and dice side is crucial for considering the hydrogen embrittlement criteria.

show abstract

Effect of Residual Stress on Hydrogen Embrittlement at Sheared Edge

et al. 2022

View full text Add to dashboard Cite

The residual stresses at a circular punched end face in tempered martensitic high-strength steel sheets were investigated using triaxial stress analysis via X-ray diffraction. The maximum principal stress and its direction were calculated from the measured nine stress components. The relationship between the directions of the maximum principal stress and hydrogen cracks was verified by generating hydrogen cracks on the punched end face in the same specimen using cathodic hydrogen charging. The direction of the cracks was perpendicular to that of the maximum principal stress. This result indicates that hydrogen embrittlement at the sheared end face is caused by the maximum principal stress. Moreover, the distribution of the residual stresses toward the thickness direction and the relationship between residual stresses and tensile strength of the specimens were investigated. The maximum principal stress on the punch side was lower than that on the dice side. Unlike the maximum principal stresses, the normal stresses did not increase monotonically with the tensile strength of the specimens. Therefore, it was concluded that investigating the maximum principal stress at any area between the dice side and a line located midway from the end face and dice side is crucial for considering the hydrogen embrittlement criteria.

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Resistance of Hydrogen Embrittlement on Hot-Sheared Surface during Die-Quench Process

Cited by 5 publications

References 10 publications

Ferrite effects on the hydrogen embrittlement of 17-4PH stainless steel

Ferrite effects on the hydrogen embrittlement of 17-4PH stainless steel

Effect of Residual Stress on Hydrogen Embrittlement at Sheared Edge

Effect of Residual Stress on Hydrogen Embrittlement at Sheared Edge

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