Effects of Interstitial Impurities on Dislocation Trapping of Hydrogen in Iron

Hagi, Hideki; Hayashi, Yasunori

doi:10.2320/jinstmet1952.51.1_24

Cited by 15 publications

(6 citation statements)

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“…Therefore, in the steel containing solute carbon atoms, not only the decrease of vacancies but also the occupation of hydrogen trapping sites around dislocations by solute carbon atoms could have a large influence on hydrogen entry. Phenomena similar to the results of this research have also been reported by Hagi et al,23) who investigated the change in the diffusion coefficient of hydrogen with heating by means of the hydrogen permeation test, using two kinds of 9% cold-rolled steels containing different levels of interstitial solute atoms. The diffusion coefficient of hydrogen increased with increasing heating temperature (below 250°C) in the steel with a high content of interstitial solute atoms, but showed little change in the steel with fewer interstitial solute atoms.…”

Section: Discussionsupporting

confidence: 88%

Influence of Low-temperature Heat Treatment after Deformation on Hydrogen Entry into Steel Sheets

Toji¹,

Takagi²,

Hasegawa³

et al. 2012

ISIJ Int.

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To ensure safety against delayed fracture caused by hydrogen embrittlement under service environments of steel sheets for auto body parts used after forming and paint baking, it is quite important to understand hydrogen entry into steels under the service environments, which could be influenced by part processing parameters such as forming and the following paint baking conditions. In this study, the influence of temperature and holding time in low-temperature heat treatment after deformation on hydrogen entry into steel sheets was investigated in detail, and the mechanism of the decrement of hydrogen entry due to the heat treatment was discussed using 0.2%C steel, 0.002%C steel and IF steel. The steels were 10-20% cold rolled to introduce plastic strain, then heat-treated at 50-170°C for 0.2-20 160 min, followed by immersion in pH 1-HCl for at most 72 h to introduce hydrogen into the steels. Hydrogen entry into the steels during immersion in pH 1-HCl increased with the cold rolling and decreased with the following lowtemperature heat treatment, and as the heating temperature and holding time increased, hydrogen entry during immersion in HCl decreased. This indicates hydrogen trapping sites, which were introduced by the cold rolling, decreased due to the low-temperature heat treatment. From a comparison of steels with and without solute carbon atoms, the decrement of hydrogen trapping sites due to the low-temperature heat treatment was attributed to both the decrement of vacancies and occupation of hydrogen trapping sites around dislocations by interstitial solute atoms such as carbon.

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Section: Discussionsupporting

confidence: 88%

Influence of Low-temperature Heat Treatment after Deformation on Hydrogen Entry into Steel Sheets

Toji¹,

Takagi²,

Hasegawa³

et al. 2012

ISIJ Int.

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“…The activation energy for TiC is reported to be 86.9 kJ/mol, 8) much larger than for VC. The activation energy for VC is larger than that for grain boundary of 17.2 kJ/mol 9) and that for dislocation of 26.8 kJ/mol 9) or 27 kJ/mol 10) and is equivalent to that for microvoid of 35.3 kJ/mol.…”

Section: Nature Of Hydrogen Trappingmentioning

confidence: 79%

Hydrogen Trapping Behavior in Vanadium-added Steel

2003

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Hydrogen trapping and de-trapping behavior was investigated for steels with and without V. The de-trapping of hydrogen is very slow while the trapping presumably proceeds rapidly for steels containing VC precipitates. The activation energy for de-trapping is in the range of 33 to 35 kJ/mol. The trapped-hydrogen content and diffusible-hydrogen content in the steady state increase with increasing hydrogen entry rate into the steel. The density of hydrogen trapping sites decides the maximum trapped-hydrogen content; 9 ppm for 1 % V steel tempered at peak secondary hardening temperature. Analysis of hydrogen embrittlement cracking tests in terms of hydrogen contents such as the critical hydrogen content should be performed on the specimens with uniform hydrogen distribution and must consider the nature of hydrogen whether it is trapped or diffusible.

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“…It was found that D decreased with an increase in the hardness, and the tendency was similar to that reported by the other researchers. 10,11) …”

Section: Diffusion Coefficients Of Hydrogen In the Steelsmentioning

confidence: 99%

Effect of Microstructural Defects on Hydrogen Absorption for Steels in Acidic Sulfate Solution

Haruna

Nii

2016

ISIJ Int.

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Effects of Interstitial Impurities on Dislocation Trapping of Hydrogen in Iron

Cited by 15 publications

References 0 publications

Influence of Low-temperature Heat Treatment after Deformation on Hydrogen Entry into Steel Sheets

Influence of Low-temperature Heat Treatment after Deformation on Hydrogen Entry into Steel Sheets

Hydrogen Trapping Behavior in Vanadium-added Steel

Effect of Microstructural Defects on Hydrogen Absorption for Steels in Acidic Sulfate Solution

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