Thermal analysis of trapped hydrogen in pure iron

Choo, W. Y.; Lee, Jun Young

doi:10.1007/bf02642424

Cited by 662 publications

(247 citation statements)

References 17 publications

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“…The thermal desorption behavior gives information about hydrogen trapping sites and hydride decomposition based on the temperature profile and the amount of desorption. 41 The decomposition behavior of electrochemically formed titanium hydrides has been investigated using TDA, XRD, and differential thermal analysis. 42 In the present study, the thermal desorption behavior agrees with that obtained by Takasaki et al, 42 suggesting the formation of hydrides in 2.0% APF solution, although hydride formation was not confirmed by XRD.…”

Section: Discussionmentioning

confidence: 99%

Fracture associated with hydrogen absorption of sustained tensile‐loaded titanium in acid and neutral fluoride solutions

Yokoyama

Kaneko

Miyamoto

et al. 2003

J Biomedical Materials Res

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Abstract:The fracture of commercial pure titanium in acid and neutral fluoride solutions has been examined by a sustained tensile-loading test and hydrogen thermal desorption analysis. It was found that the fracture of titanium occurred in neutral 2.0% NaF solution as well as in 2.0% acidulated phosphate fluoride (APF) solution. The time to fracture decreased with increasing applied stress in both 2.0% APF and 2.0% NaF solutions. In the case of the same applied stress, the time to fracture in the 2.0% APF solution was shorter than that in the 2.0% NaF solution. General corrosion was exhibited on the side surface of the tested specimens. The formation of sodium titanium fluoride was observed on the surface of the immersed specimens in the 2.0% APF solution. Hydrogen desorption of the tested specimen in the 2.0% APF solution was observed with a peak at approximately 600°C. The amount of absorbed hydrogen was Ͼ300 mass ppm in the 2.0% APF solution under an applied stress for 24 h. The results of the present study imply that applying stress to titanium by immersing in fluoride solutions leads to the degradation of its mechanical properties.

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Section: Discussionmentioning

confidence: 99%

Fracture associated with hydrogen absorption of sustained tensile‐loaded titanium in acid and neutral fluoride solutions

Yokoyama

Kaneko

Miyamoto

et al. 2003

J Biomedical Materials Res

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“…Figure 8 shows the peak analysis for the N1 series below 473 K. The summation of two Gaussian curves (curve1 and curve2) was fitted suitably for the original profiles. When compared with Choo et al's results, 18) curve2 may correspond to the hydrogen desorbed from grain boundaries, while curve1 is due to the hydrogen desorbed from the matrix. Therefore, the following discussion is based on assuming that the hydrogen content desorbed below 423 K, C H , is the sum of the hydrogen content in the grain boundary, C gb , and in the matrix, C m .…”

Section: Discussionmentioning

confidence: 56%

Effects of Grain Size on Hydrogen Environment Embrittlement of High Strength Low Alloy Steel in 45 MPa Gaseous Hydrogen

et al. 2010

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The effect of grain size on the susceptibility of high-strength low alloy steels to hydrogen environment embrittlement in a 45 MPa gaseous hydrogen atmosphere was examined in term of the hydrogen content penetrating the specimen during the deformation. Notch tensile tests were performed in a 45 MPa hydrogen environment using specimens with different prior austenite grain size numbers varying from 2.5 to 5.4. The hydrogen content was measured by thermal desorption analysis with a quadrupole mass spectrometer before and after the tensile test. The fracture stress of the notch tensile test increased with increasing grain size number; this showed that grain refinement was effective in reducing the susceptibility of the specimens to hydrogen environment embrittlement in a high-pressure hydrogen atmosphere. The addition of nickel did not affect the fracture stress. A remarkable increase in the content of diffusive hydrogen was observed after the notch tensile test. Assuming that part of the diffusive hydrogen desorbed from grain boundaries, it can be inferred that grain refinement can reduce the mass of hydrogen in the unit grain boundary area, and the susceptibility to high-pressure hydrogen environment embrittlement.

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“…[16] and Choo et.al. [17] have shown, that the capability of austenite to hold hydrogen atoms is stronger than for dislocations. This is why they accumulate at the boundaries and recombines there [18].…”

Section: Microstructurementioning

confidence: 99%

Mechanical properties of low-alloy-steels with bainitic microstructures and varying carbon content

Weber

Klarner

Vogl

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Materials used in the oilfield industry are subjected to special conditions. These requirements for seamless steel tubes are between the priorities of strength, toughness and sour gas resistance. Steels with bainitic microstructure provide a great opportunity for those harsh environmental conditions. With different morphologies of bainite, like carbide free, upper or lower bainite, the interaction of high tensile strength and elongation is assumed to be better than with tempered martensite. To form carbide free bainite two ways of processing are proposed, isothermal holding with accurate time control or controlled continuous cooling. Both require knowledge of time-temperature transformation behaviour, which can be reached through a detailed alloying concept, focused on the influence of silicon to supress the carbide nucleation and chromium to stabilize the austenite fraction. The present work is based on three alloys with varying silicon and chromium contents. The carbide free microstructure is obtained by a continuous cooling path. Additionally different heat treatments were done to compare the inherent performance of the bainitic morphologies. The bainitic structures were characterized metallographically for their microstructure and the primary phase by means of transmission electron microscopy. The mechanical properties of carbide-free structures were analysed with quasi-static tensile tests and Charpy impact tests. Moreover, investigations about hydrogen embrittlement were done with focus on the effect of retained austenite. The results were ranked and compared qualitatively.

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Thermal analysis of trapped hydrogen in pure iron

Cited by 662 publications

References 17 publications

Fracture associated with hydrogen absorption of sustained tensile‐loaded titanium in acid and neutral fluoride solutions

Fracture associated with hydrogen absorption of sustained tensile‐loaded titanium in acid and neutral fluoride solutions

Effects of Grain Size on Hydrogen Environment Embrittlement of High Strength Low Alloy Steel in 45 MPa Gaseous Hydrogen

Mechanical properties of low-alloy-steels with bainitic microstructures and varying carbon content

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