Fatigue life of helium-implanted AISI 316 L at 500 and 600°C

Leeser, A.; Ullmaier, H.

doi:10.1016/0022-3115(88)90450-3

Cited by 11 publications

(2 citation statements)

References 9 publications

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“…At elevated temperatures, the helium bubbles grow rapidly resulting in weakening of the grain boundaries [1][2][3]. Under the influence of tensile stress, the formation of helium bubbles leads to intergranular fracture, so-called helium embrittlement [4,5]. Furthermore, heat-affected zone (HAZ) cracking is a serious problem encountered upon repairing structural and core materials containing high concentrations of helium [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Surface cracking on Σ3, Σ9 CSL and random grain boundaries in helium implanted 316L austenitic stainless steel

Sakaguchi

Ohguchi

Shibayama

et al. 2013

Journal of Nuclear Materials

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The relationship between surface cracking at grain boundaries and the grain boundary nature in helium implanted 316L austenitic stainless steel was investigated by in-situ annealing in a high-voltage electron microscope, and by SEM and TEM observations. The nucleation and growth of helium bubbles at a random grain boundary was observed during annealing up to 973 K. After annealing, surface cracking was observed at the random grain boundaries and some coincidence site lattice (CSL) boundaries because of the formation and rupture of the helium bubbles at these grain boundaries. At the faceted CSL boundaries, surface cracking occurred only on one boundary facet plane. This indicates that the twin boundary and pure tilt Σ9 CSL boundary show the highest resistance to cracking because of their low boundary energies.

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Section: Introductionmentioning

confidence: 99%

Surface cracking on Σ3, Σ9 CSL and random grain boundaries in helium implanted 316L austenitic stainless steel

Sakaguchi

Ohguchi

Shibayama

et al. 2013

Journal of Nuclear Materials

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“…For instance, helium bubbles formed at the GBs result in intergranular embrittlement at high temperature. The phenomenon can be interpreted as a 'breathing' mode [7,8]. That is, under cycling stress at low frequency, helium bubbles on the GBs will grow to become void-type cavities due to the diffusion of vacancies during the tensile stage.…”

Section: Introductionmentioning

confidence: 99%

Atomistic simulation of brittle fracture in nickel induced by He-doping

Jiang

Wang

Zhang

2007

Modelling Simul. Mater. Sci. Eng.

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Molecular dynamics was used to study the effects of He-doping on brittle fracture in Ni. It was found that the released strain energy during crack propagation with He-doping (Er) is higher than that without He-doping (Er0). Enhancement of the strain energy due to He-doping contributes to a driving force to promote crack growth. This indicates that doping of He clusters in Ni favors crack growth, particularly for He clusters with high He-to-vacancy ratios, in which strong He–Ni interaction plays an important role. Furthermore, Er decreases non-linearly with increasing distance of He clusters away from the crack tip. Our results show that embrittlement of the materials will be enhanced when either the He concentration or the fracture density is above a critical value. The effect of critical He concentration on embrittlement of the materials has been reported in experimental studies.

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3.4.3 Growth and coarsening

Ullmaier¹

Atomic Defects in Metals

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Fatigue life of helium-implanted AISI 316 L at 500 and 600°C

Cited by 11 publications

References 9 publications

Surface cracking on Σ3, Σ9 CSL and random grain boundaries in helium implanted 316L austenitic stainless steel

Surface cracking on Σ3, Σ9 CSL and random grain boundaries in helium implanted 316L austenitic stainless steel

Atomistic simulation of brittle fracture in nickel induced by He-doping

3.4.3 Growth and coarsening

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