Tritium Aging Effects on the Fracture Toughness Properties of Forged Stainless Steel

Morgan, Michael

doi:10.1002/9780470483428.ch23

Cited by 8 publications

(19 citation statements)

References 12 publications

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“…This is consistent with the effects of hydrogen isotopes on fracture-toughness properties seen in earlier studies (4,8,13). The observation that Type 316L stainless steel had the higher fracture-toughness properties than the other steels is in good agreement with those of earlier investigations by Robinson (1,2) and Caskey (12).…”

Section: Discussionsupporting

confidence: 82%

“…7 and 8). Part of the difference can be explained by the fact that the HERF Type 21-6-9 steel had been sensitized which reduced its toughness (8). Nevertheless, the toughness of HERF Type 316L was still 25-65% higher than the conventionally forged heats of Types 304L and 21-6-9 ( Figure 6).…”

Section: Discussionmentioning

confidence: 89%

“…The change in properties has been attributed to hydrogen embrittlement of the microstructure that is made worse because of presence of helium-3 from tritium decay (1). Typically, steels with decay helium bubble microstructures are hardened and less able to deform plastically, and become more susceptible to embrittlement by hydrogen and its isotopes (1)(2)(3)(4)(5)(6)(7)(8).…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Effects on the Fracture Toughness Properties of Forged Stainless Steels

Morgan

2008

Volume 6: Materials and Fabrication, Parts a and B

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The effect of hydrogen on the fracture toughness properties of Types 304L, 316L and 21-6-9 forged stainless steels was investigated. Fracture toughness samples were fabricated from forward-extruded forgings. Samples were uniformly saturated with hydrogen after exposure to hydrogen gas at 34 MPa or 69 and 623 K prior to testing. The fracture toughness properties were characterized by measuring the J-R behavior at ambient temperature in air. The results show that the hydrogen-charged steels have fracture toughness values that were about 50-60% of the values measured for the unexposed steels. The reduction in fracture toughness was accompanied by a change in fracture appearance. Both uncharged and hydrogen-charged samples failed by microvoid nucleation and coalescence, but the fracture surfaces of the hydrogen-charged steels had smaller microvoids. Type 316L stainless steel had the highest fracture toughness properties and the greatest resistance to hydrogen degradation.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Hydrogen Effects on the Fracture Toughness Properties of Forged Stainless Steels

Morgan

2008

Volume 6: Materials and Fabrication, Parts a and B

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“…These steels are resistant to, but not immune from, the embrittling effects of hydrogen isotopes and helium from tritium decay. Cracking in storage vessels has been observed after extended service times and material properties like ductility, elongation-to-failure, and fracture toughness are reduced with time as tritium and its radioactive decay product, He 3 , accumulate within the vessel walls during service [1][2][3][4][5][6][7][8]. The factors that affect the tendency for crack formation and propagation include: (a) time of exposure; (b) steel type; (c) steel microstructure; (d) reservoir geometry and gas pressure; and, (e) reservoir residual stresses from welding and manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Fracture Toughness Properties of Tritium Charged and Aged Stainless Steels: SRNL and SNL Collaboration Test Plan and 2018 Results

Krentz

Hitchcock

Morgan

et al. 2019

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“…Austenitic stainless steels are used to fabricate containment vessels for hydrogen and its isotopes because of their high resistance to hydrogen-induced embrittlement [1,2]. However, the structural properties may still degrade during the long service life as the hydrogen atoms diffuse into the vessel walls and make the vessels susceptible to cracking.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Crack Extensions in Arc-Shaped Specimens of Hydrogen-Charged Austenitic Stainless Steels Using Cohesive Zone Model

Sung

Pan

et al. 2018

Volume 6A: Materials and Fabrication

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Crack extensions in arc-shaped specimens of hydrogen-charged and as-received conventionally forged (CF) 21-6-9 austenitic stainless steels are investigated by two-dimensional finite element analyses with the cohesive zone model. The material constitutive relation is first obtained from fitting the experimental tensile stress-strain data by conducting an axisymmetric finite element analysis of a round bar tensile specimen of the as-received CF steel. The material constitutive relation for the hydrogen-charged CF steel is estimated based on the experimental tensile stress-strain data of the as-received CF steel and the hydrogen-charged high-energy-rate-forged (HERF) 21-6-9 stainless steel. The cohesive zone model with the exponential traction-separation law is then adopted to simulate crack extensions in arc-shaped specimens of the hydrogen-charged and as-received CF steels. The cohesive strength of the cohesive zone model is calibrated to match the experimental load-displacement curve with the cohesive energy determined by the J-integral at the maximum load of the arc-shaped specimen. The computational results showed that the numerical predictions of the load-displacement and crack extension-displacement curves for the hydrogen-charged and as-received CF steel specimens are compared reasonably well with the experimental data.

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Tritium Aging Effects on the Fracture Toughness Properties of Forged Stainless Steel

Cited by 8 publications

References 12 publications

Hydrogen Effects on the Fracture Toughness Properties of Forged Stainless Steels

Hydrogen Effects on the Fracture Toughness Properties of Forged Stainless Steels

Fracture Toughness Properties of Tritium Charged and Aged Stainless Steels: SRNL and SNL Collaboration Test Plan and 2018 Results

Modeling of Crack Extensions in Arc-Shaped Specimens of Hydrogen-Charged Austenitic Stainless Steels Using Cohesive Zone Model

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