Strain incompatibilities and their role in intergranular cracking of irradiated 316L stainless steel

West, E. A.; Was, Gary S.

doi:10.1016/j.jnucmat.2012.10.021

Cited by 41 publications

(15 citation statements)

References 23 publications

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“…Previous studies have pointed to the importance of the orientation of slip systems relative to the GB plane in controlling susceptibility to integranular cracking [37][38][39] . In these studies, favourably oriented slip channels impinging on GBs cause incorporation of dislocations directly into the boundary plane.…”

Section: Discussionmentioning

confidence: 99%

The dual role of coherent twin boundaries in hydrogen embrittlement

et al. 2015

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Hydrogen embrittlement (HE) causes engineering alloys to fracture unexpectedly, often at considerable economic or environmental cost. Inaccurate predictions of component lifetimes arise from inadequate understanding of how alloy microstructure affects HE. Here we investigate hydrogen-assisted fracture of a Ni-base superalloy and identify coherent twin boundaries (CTBs) as the microstructural features most susceptible to crack initiation. This is a surprising result considering the renowned beneficial effect of CTBs on mechanical strength and corrosion resistance of many engineering alloys. Remarkably, we also find that CTBs are resistant to crack propagation, implying that hydrogen-assisted crack initiation and propagation are governed by distinct physical mechanisms in Ni-base alloys. This finding motivates a re-evaluation of current lifetime models in light of the dual role of CTBs. It also indicates new paths to designing materials with HE-resistant microstructures.

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Section: Discussionmentioning

confidence: 99%

The dual role of coherent twin boundaries in hydrogen embrittlement

et al. 2015

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“…Open questions from an experimental point of view also include the evaluation of continuity of slip traces. Several types of continuity and discontinuity exist, as briefly discussed in the work at hand and shown in detail, e.g., in [26]. Computational models that incorporate slip transmission, consequently, also need to define ad hoc the continuity of plastic slip.…”

Section: Resultsmentioning

confidence: 99%

“…2 a). In [26], some of the developing slip traces, in the grain adjacent to a pile-up, were observed to spread over the whole grain (see schematic in Fig. 2 b)), but others reached only a few microns (Fig.…”

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confidence: 98%

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Review on slip transmission criteria in experiments and crystal plasticity models

et al. 2015

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A comprehensive overview is given of the literature on slip transmission criteria for grain boundaries in metals, with a focus on slip system and grain boundary orientation. Much of this extensive literature has been informed by experimental investigations. The use of geometric criteria in continuum crystal plasticity models is discussed. The theoretical framework of Gurtin (2008, J. Mech. Phys. Solids 56, p. 640) is reviewed for the single slip case. This highlights the connections to slip transmission criteria from the literature that are not discussed in the work itself. Different geometric criteria are compared for the single slip case with regard to their prediction of slip transmission. Perspectives on additional criteria, investigated in experiments and used in computational simulations, are given.

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“…Localized deformation may be the most important factor in IASCC; it may promote the cracking through intensive interaction of dislocations in slip channels with grain boundaries. A relationship between strain localized in dislocation channels and crystallographic structure of grain boundaries was studied on proton irradiated 316L stainless steel [57]. The consistent occurrence of strain in-compatibilities, i.e., dislocation channels arrested at grain boundaries at the sites of crack initiation, suggested that it might promote IG cracking.…”

Section: Irradiation Assisted Scc Fracturementioning

confidence: 99%

Overview of Intergranular Fracture of Neutron Irradiated Austenitic Stainless Steels

Hojná

2017

Metals

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Austenitic stainless steels are normally ductile and exhibit deep dimples on fracture surfaces. These steels can, however, exhibit brittle intergranular fracture under some circumstances. The occurrence of intergranular fracture in the irradiated steels is briefly reviewed based on limited literature data. The data are sorted according to the irradiation temperature. Intergranular fracture may occur in association with a high irradiation temperature and void swelling. At low irradiation temperature, the steels can exhibit intergranular fracture at low or even at room temperatures during loading in air and in high temperature water (~300 • C). This paper deals with the similarities and differences for IG fractures and discusses the mechanisms involved. The intergranular fracture occurrence at low temperatures might be correlated with decohesion or twinning and strain martensite transformation in local narrow areas around grain boundaries. The possibility of a ductile-to-brittle transition is also discussed. In case of void swelling higher than 3%, quasi-cleavage at low temperature might be expected as a consequence of ductile-to-brittle fracture changes with temperature. Any existence of the change in fracture behavior in the steels of present thermal reactor internals with increasing irradiation dose should be clearly proven or disproven. Further studies to clarify the mechanism are recommended.

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Strain incompatibilities and their role in intergranular cracking of irradiated 316L stainless steel

Cited by 41 publications

References 23 publications

The dual role of coherent twin boundaries in hydrogen embrittlement

The dual role of coherent twin boundaries in hydrogen embrittlement

Review on slip transmission criteria in experiments and crystal plasticity models

Overview of Intergranular Fracture of Neutron Irradiated Austenitic Stainless Steels

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