Influence of titanium and carbon contents on the hydrogen trapping of microalloyed steels

Valentini, Renzo; Solina, A.; Matera, Susanna; Gregorio, Pasquale

doi:10.1007/bf02595626

Cited by 44 publications

(26 citation statements)

References 19 publications

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“…The permeation transients were expressed in normalised units i.e., in terms of normalised flux and dimensionless time [19,39]. The flux was normalised with respect to the steady state value and the dimensionless time was obtained by using the equation,…”

Section: Analysis Of Permeation Transientsmentioning

confidence: 99%

“…The higher Ti, C and N contents of the medium Mn X70 steel were reported to result in a significantly larger fraction of carbonitride precipitates. Fine precipitates of TiC, NbC or complex carbonitrides of Ti and Nb have been found to act as strong irreversible traps [2,18,19]. Permeability studies in pipeline steels by Koh et al [30] have also shown that diffusivity of hydrogen decreases as the density of precipitates increases.…”

Section: Comparison Of Standard Mn and Medium Mn Stripmentioning

confidence: 99%

“…They also reported that the trapping efficiency increased with sulphur content. In addition to inclusions, precipitates of Ti, Nb and V such as TiC, TiN, NbC, VC, complex Ti,Nb(C,N), Ti 4 C 2 S 2 etc., are all considered to be irreversible traps [2,[17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Effect of microstructure and composition on hydrogen permeation in X70 pipeline steels

Haq

Muzaka

Dunne

et al. 2013

International Journal of Hydrogen Energy

164

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The influence of microstructure and composition on permeation of hydrogen in 1.2 and 0.5 wt.% Mn X70 pipeline steels after different processing was investigated using an electrochemical permeation technique. For 1.2 wt.% Mn (standard Mn) steel, the microstructure of normalised transfer bar was coarse equiaxed ferrite grains. This sample exhibited the highest diffusivity, followed by transfer bar, with a mixed ferriteebainitic ferrite microstructure; and hot rolled strip, with fine elongated ferrite grains. The 0.5 wt.% Mn (medium Mn) strip displayed lower diffusivity than the 1.2 wt.% Mn strip, due to hydrogen trapping by finer ferrite grains and a higher density of carbonitride precipitates. Moreover, the medium Mn strip exhibited a uniform microstructure and consequently similar diffusion coefficients for the edge and centreline regions, whereas the finer grains of the edge region of the standard Mn strip resulted in a lower diffusivity than the centreline region. Copyright © 2012, Hydrogen Energy Publications, LLC. AbstractThe influence of microstructure and composition on permeation of hydrogen in 1.2 and 0.5 wt.% Mn X70 pipeline steels after different processing was investigated using an electrochemical permeation technique. For 1.2 wt.% Mn (standard Mn) steel, the microstructure of normalised transfer bar was coarse equiaxed ferrite grains. This sample exhibited the highest diffusivity, followed by transfer bar, with a mixed ferrite -bainitic ferrite microstructure; and hot rolled strip, with fine elongated ferrite grains.The 0.5 wt.% Mn (medium Mn) strip displayed lower diffusivity than the 1.2 wt.% Mn strip, due to hydrogen trapping by finer ferrite grains and a higher density of carbonitride precipitates.Moreover, the medium Mn strip exhibited a uniform microstructure and consequently similar diffusion coefficients for the edge and centreline regions, whereas the finer grains of the edge region of the standard Mn strip resulted in a lower diffusivity than the centreline region.

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Section: Analysis Of Permeation Transientsmentioning

confidence: 99%

Section: Comparison Of Standard Mn and Medium Mn Stripmentioning

confidence: 99%

See 1 more Smart Citation

Effect of microstructure and composition on hydrogen permeation in X70 pipeline steels

Haq

Muzaka

Dunne

et al. 2013

International Journal of Hydrogen Energy

164

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“…Furthermore, they suggested that the interaction energy between titanium carbide and hydrogen increases with particle size, resulting in a higher desorption rate peak temperature. Valentini et al 9) found that in steels containing various amounts of TiC, the largest number of irreversible traps was associated with steels having the largest volume fraction of fine and coherent Ti(C, N) precipitates with a mean particle size ranging from 12.5 to 30 nm. However, they indicated that the Ti(C, N) has a tetragonal crystal structure.…”

Section: )mentioning

confidence: 99%

“…TiC interacts strongly with hydrogen; therefore, its effect on hydrogen trapping and diffusivity has been studied as a model trap by many workers [3][4][5][6][7][8][9] by thermal desorption spectrometry (TDS) 10) and the hydrogen permeation test.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Trapping in Quenched and Tempered 0.42C-0.30Ti Steel Containing Bimodally Dispersed TiC Particles

et al. 2003

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The effect of tempering on hydrogen trapping in 0.42C-0.30Ti steel was studied by means of a hardness test, hydrogen thermal desorption spectrometry and high resolution transmission electron microscopy. In addition to the coarse undissolved TiC particles, fine TiC particles with a volume fraction up to 0.22 % precipitated during tempering at temperatures above 500°C. Coherent TiC square platelets with a diagonal length of about 2 nm and a thickness of less than 1 nm precipitated at 550 and 600°C, acting as reversible hydrogen traps. Tempering at 700°C caused the fine TiC particles to lose their coherency with the matrix, resulting in a very limited increase in reversibly trapped hydrogen content compared to the samples tempered below 500°C without TiC precipitation. On the other hand, the coarse undissolved TiC particles with an average diameter of 2 mm, acting as irreversible traps, greatly enhanced the irreversibly trapped hydrogen content when tempered at 500°C and were accompanied by a decrease in hydrogen desorption rate peak temperature. Comparison of both types of TiC particles with the same volume fraction indicated that the fine coherent TiC platelets were more effective in trapping hydrogen than the coarse incoherent undissolved TiC particles.KEY WORDS: hydrogen trapping; reversible and irreversible traps; titanium carbide; coherency; thermal desorption spectrometry; high resolution transmission electron microscopy.

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The Impact of Nb, Ti, Zr, B, V, and Mo on the Hydrogen Diffusion in Four Different AHSS/UHSS Microstructures

Rehrl

Mraczek

Pichler

et al. 2013

steel research int.

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Advanced and ultra-high strength steels (AHSS/UHSS) are susceptible to hydrogen embrittlement (HE), [1][2][3][4] for which diffusion of hydrogen is essential. [5,6] To obtain information on hydrogen diffusion in AHSS grades, the present work is focusing on the impact of AHSS grade microstructures and microalloying elements (Nb, Ti, Zr, V, B, and Mo) on the hydrogen diffusion coefficient and the density and energy of reversible traps. For this purpose hydrogen diffusion in non-and microalloyed dual-phase-, complex-phase, and tempered martensitic microstructures with tensile strength levels between 1200 and 1400 MPa was analyzed. The diffusion coefficient and trapping parameters were determined via electrochemical permeation measurements according to the works of Grabke et al. [7] and Gehrmann. [8] Generally, a dependence of the hydrogen diffusion coefficient on the microstructure was found with tempered martensitic microstructures showing the highest diffusion coefficents followed by dual-phase microstructures. Complex-phase microstructures reveal the lowest values for the diffusion coefficient. A significant dependence of the diffusion coefficient and trapping parameters on microalloying is not evident, except for substitutionally dissolved Mo and V-precipitates which tend to influence the density of reversible traps significantly.

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Influence of titanium and carbon contents on the hydrogen trapping of microalloyed steels

Cited by 44 publications

References 19 publications

Effect of microstructure and composition on hydrogen permeation in X70 pipeline steels

Effect of microstructure and composition on hydrogen permeation in X70 pipeline steels

Hydrogen Trapping in Quenched and Tempered 0.42C-0.30Ti Steel Containing Bimodally Dispersed TiC Particles

The Impact of Nb, Ti, Zr, B, V, and Mo on the Hydrogen Diffusion in Four Different AHSS/UHSS Microstructures

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