Reversible and irreversible hydrogen trapping in metals: new computer-based code THYDA

Valentini, Renzo; Solina, A.; Tonelli, Leonida; Lanza, S.; Benamati, G.; Donato, A.

doi:10.1016/s0022-3115(96)00145-6

Cited by 10 publications

(8 citation statements)

References 7 publications

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“…12 as a function of cathodic current density as well as the calculation results following to McNabb & Foster trapping model. [61][62][63][64] According to the previous research, the critical hydrogen concentration required to induce cracking of martensitic steels is reported as a several mass ppm, 30) and our analysis results of 9Cr ferritic/martensitic steels revealed that the critical concentration, which corresponded to the current density of À4 A/m 2 , is also in the range of 1$2 mass ppm. On the contrary, hydrogen concentration in 14Cr-ODS steel is much higher than that of the RAF steels at the same charging condition, and critical hydrogen concentration for the 14Cr-ODS was in the range of 10$12 mass ppm that was almost 10 times higher concentration than the 9Cr ferritic/martensitic steels.…”

Section: Hydrogen Embrittlementmentioning

confidence: 80%

“…66) Therefore, it is considered that the peak IV is due to helium desorption from the -phase in which the defects still remain and play a role in trapping helium. Finally, in the ODS steels, the fraction of helium desorption by bubble migration mechanism was smaller than in the Following the hydrogen trapping model, [61][62][63][64] the amount of trapped hydrogen was calculated and shown as dotted lines in the figure. 27) Almost no effect was observed for 14Cr and 16Cr-ODS steels, while 22Cr-ODS steel showed a significant aging embrittlement.…”

Section: Helium Trapping Behaviormentioning

confidence: 99%

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Current Status of Reduced-Activation Ferritic/Martensitic Steels R&D for Fusion Energy

Kimura

2005

Mater. Trans.

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Reduced-activation ferritic/martensitic (RAF/M) steels have been considered to be the prime candidate for the fusion blanket structural material. The irradiation data obtained up to now indicates rather high feasibility of the steels for application to fusion reactors because of their high resistance to degradation of material performance caused by both the irradiation-induced displacement damage and transmutation helium atoms. The martensitic structure of RAF/M steels consists of a large number of lattice defects before the irradiation, which strongly retards the formation of displacement damage through absorption and annihilation of the point defects generated by irradiation. Transmutation helium can be also trapped at those defects in the martensitic structure so that the growth of helium bubbles at grain boundaries is suppressed. The major properties of the steels are well within our knowledge, and processing technologies are mostly developed for fusion application. RAF/M steels are now certainly ready to proceed to the next stage, that is, the construction of International Thermo-nuclear Experimental Reactor Test Blanket Modules (ITER-TBM).Oxide dispersion strengthening (ODS) steels have been developed for higher thermal efficiency of fusion power plants. Recent irradiation experiments indicated that the steels were quite highly resistant to neutron irradiation embrittlement, showing hardening accompanied by no loss of ductility. High-Cr ODS steels whose chromium concentration was in the range from 14 to 19 mass% showed high resistance to corrosion in supercritical pressurized water. It is shown that the 14Cr-ODS steel is susceptible to neither hydrogen nor helium embrittlement.A combined utilization of ODS steels with RAF/M steels will be effective to realize fusion power early at a reasonable thermal efficiency.

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Section: Hydrogen Embrittlementmentioning

confidence: 80%

Section: Helium Trapping Behaviormentioning

confidence: 99%

Current Status of Reduced-Activation Ferritic/Martensitic Steels R&D for Fusion Energy

Kimura

2005

Mater. Trans.

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“…The calculation used the trap densities (N t ) and binding energy (E b ) of 6.3 · 10 24 sites/m 3 and 39.0 kJ/mol for Mod. F82H and 1.5 · 10 25 sites/m 3 and 39.5 kJ/mol for MANET II, respectively [7,8].…”

Section: Critical Hydrogen Concentration For Ods Steelsmentioning

confidence: 99%

Effects of hydrogen on the mechanical properties of oxide dispersion strengthening steels

Lee

Kimura

Ukai³

et al. 2004

Journal of Nuclear Materials

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“…[3][4][5][6][7][8][9][10][11][12][13][14] Whilst analytical treatments often led to complex equations for the effective diffusivity and fractional occupancy, 3,8) they promoted greatly our understanding of the characteristics of diffusion and the nature of trapping of hydrogen in iron. On the other hand, computer modeling can meet practical requirements, e.g.…”

Section: Introductionmentioning

confidence: 99%

Modeling Thermal Desorption Analysis of Hydrogen in Steel

2006

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A computer model was developed to simulate the thermal desorption flux of hydrogen from steel specimens by an explicit finite difference method, which is convergent and stable for all time increment. The influences of experimental parameters, e.g. ramp rate, specimen size and duration of exposure at ambient temperature etc., on the desorption spectrum, concentration profile of hydrogen in the lattice and fractional occupancy at the trapping sites, were studied assuming that the major trapping sites were dislocations. The increase in ramp rate caused a marked shift in the desorption peak to a higher temperature, whilst the increase in the specimen size shifted the peak to higher temperatures to a moderate extent. The duration of exposure may have a considerable influence on the thermal desorption spectra when the desorption peak is associated with a lower binding energy trap site.

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Reversible and irreversible hydrogen trapping in metals: new computer-based code THYDA

Cited by 10 publications

References 7 publications

Current Status of Reduced-Activation Ferritic/Martensitic Steels R&D for Fusion Energy

Current Status of Reduced-Activation Ferritic/Martensitic Steels R&D for Fusion Energy

Effects of hydrogen on the mechanical properties of oxide dispersion strengthening steels

Modeling Thermal Desorption Analysis of Hydrogen in Steel

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