ToF-SIMS analyses of brittle crack initiation of T91 steel by liquid sodium

Hamdane, O; Serre, Ingrid Proriol; Vogt, Jean‐Bernard; Nuns, Nicolás

doi:10.1016/j.matchemphys.2014.02.016

Cited by 10 publications

(3 citation statements)

References 30 publications

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“…It was at the same time found that interlath cracks can be arrested by carbide precipitation at interlaths. Meanwhile, it was shown that interlath cracking is clearly enhanced, and correspondingly so is LME susceptibility, when the carbide distribution is modified such that carbides are depleted at the lath boundaries [7]. This implies that not only knowledge about the atomic scale mechanism is required but also a detailed mesoscopic understanding is crucially important for a correct understanding of LME's occurrence and the definition of sound strategies for LME's mitigation.…”

Section: Introductionmentioning

confidence: 99%

Crack path in liquid metal embrittlement: experiments with steels and modeling

Auger¹,

Hémery²,

Bourcier³

et al. 2015

Frattura Ed Integrità Strutturale

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We review the recent experimental clarification of the fracture path in Liquid Metal Embrittlement with austenitic and martensitic steels. Using state of the art characterization tools (Focused Ion Beam and Transmission Electron Microscopy) a clear understanding of crack path is emerging for these systems where a classical fractographic analysis fails to provide useful information. The main finding is that most of the cracking process takes place at grain boundaries, lath or mechanical twin boundaries while cleavage or plastic flow localization is rarely the observed fracture mode. Based on these experimental insights, we sketch an ongoing modeling strategy for LME crack initiation and propagation at mesoscopic scale. At the microstructural scale, crystal plasticity constitutive equations are used to model the plastic deformation in metals and alloys. The microstructure used is either extracted from experimental measurements by 3D-EBSD (Electron Back Scattering Diffraction) or simulated starting from a Voronoï approach. The presence of a crack

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Section: Introductionmentioning

confidence: 99%

Crack path in liquid metal embrittlement: experiments with steels and modeling

Auger¹,

Hémery²,

Bourcier³

et al. 2015

Frattura Ed Integrità Strutturale

View full text Add to dashboard Cite

show abstract

“…They used a hardening heat treatment by tempering the T91 F/M steel at lower temperature (500 • C instead of 760 • C). This increased the steel hardness by almost a factor of two, changed the carbide distribution from interlath to intralath, and altered the dislocation density [458,459]. The tempering heat treatment also aimed at simulating the mechanical hardening induced by the low-temperature (<400 • C) irradiation of Fe-9Cr alloys.…”

Section: The Role Of Surface State On Lme Of 9cr Steels (Wettability ...mentioning

confidence: 99%

“…With the decrease of the tempering temperature, the quantity of C atoms that can precipitate at GBs decreases. Indeed, after a sufficiently low-temperature tempering heat treatment, dislocations that formed during the martensitic transformation serve as nucleation sites to nanoscale intragranular carbide precipitates instead of forming interlath carbides [458,459]. The dislocations are pinned at the carbides and annealing does not decrease the steel hardness very efficiently.…”

Section: The Role Of the Steel Metallurgical Statementioning

confidence: 99%