Anisotropic radiation-induced segregation in 316L austenitic stainless steel with grain boundary character

Barr, Christopher M.; Vetterick, G.; Unocic, Kinga A.; Hattar, Khalid Mikhiel; Bai, Xian-Ming; Taheri, Mitra L.

doi:10.1016/j.actamat.2013.11.060

Cited by 82 publications

(34 citation statements)

References 52 publications

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“…The GBE microstructure consisted of 5% rolling reduction of nominal 10 mm thick samples followed by a 1025°C anneal in open air for 90 min and water quench. 46 The GBE and SA microstructures were examined by EBSD with a TexSEM Laboratories orientation imaging microscopy (OIM®) system. GB length and number population of twin and twin-variant GBs (Σ3 n ) were calculated using the Brandon criterion for CSL GBs.…”

Section: Methodsmentioning

confidence: 99%

Tracking the evolution of intergranular corrosion through twin-related domains in grain boundary networks

et al. 2018

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Tailoring the grain boundary network is desired to improve grain boundary-dependent phenomena such as intergranular corrosion. An important grain boundary network descriptor in heavily twinned microstructures is the twin-related domain, a cluster of twinrelated grains. We indicate the advantages of using twin-related domains and subsequent statistics to provide new insight into how a grain boundary networks respond to intergranular corrosion in a heavily twinned grain boundary engineered 316L stainless steel. The results highlight that intergranular corrosion is typically arrested inside twin-related domains at coherent twins or low-angle grain boundaries. Isolated scenarios exist, however, where intergranular corrosion propagation persists in the grain boundary network through higher-order twin-related boundaries.

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Section: Methodsmentioning

confidence: 99%

Tracking the evolution of intergranular corrosion through twin-related domains in grain boundary networks

et al. 2018

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“…RIS has been successfully used to investigate the sink characteristics of specific grain boundary types in both austenitic and ferritic/martensitic steels using experiments and modeling [25][26][27][28][29][30][31][32][33][34][35][36]. These studies have shown the grain boundary type, whether a low-angle grain boundary, random high-angle grain boundary, or low-Σ coincident site lattice (CSL) boundary, will have different sink characteristics due to the local structure of the grain boundary and can be correlated to their coherency and hence grain boundary energetics.…”

Section: Numerous Light Water Reactor (Lwr) Nuclear Power Plants In Tmentioning

confidence: 99%

“…In this formalism, the RIS response of specific grain boundary types cannot be accurately evaluated as the perfect sink criteria maintains the point defect concentration at thermodynamic equilibrium at the boundary. Recent work by several authors has indicated that the perfect sink formalization used in typical rate theory models does not account for the RIS response seen at different grain boundary types/structures in both FCC and body centered cubic irradiated steels [25,26,29,30,32,33,36]. To overcome this deficiency, the MIK model was modified using the alternative boundary conditions developed by Duh et al [31].…”

Section: Implementation Of Grain Boundary Structure Effectsmentioning

confidence: 99%

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Defect sink characteristics of specific grain boundary types in 304 stainless steels under high dose neutron environments

et al. 2015

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Radiation induced segregation (RIS) is a well-studied phenomena which occurs in many structurally relevant nuclear materials including austenitic stainless steels. RIS occurs due to solute atoms preferentially coupling with mobile point defect fluxes that migrate and interact with defect sinks. Here, a 304 stainless steel was neutron irradiated up to 47.1 dpa at 320°C. Investigations into the RIS response at specific grain boundary types were utilized to determine the sink characteristics of different boundary types as a function of irradiation dose. A rate theory model built on the foundation of the modified inverse Kirkendall (MIK) model is proposed and benchmarked to the experimental results. This model, termed the GiMIK model, includes alterations in the boundary conditions based on grain boundary structure and expressions for interstitial binding. This investigation, through experiment and modeling, found specific grain boundary structures exhibit unique defect sink characteristics depending on their local structure. Such interactions were found to be consistent across all doses investigated and to have larger global implications, including precipitation of Ni-Si clusters near different grain boundary types.

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“…Desegregation of dopants at the grain boundary could also degrade thermodynamic grain size stabilization and cause grain growth [94][95][96]. For example, Cr depletion and Ni enrichment have been observed at the grain boundaries of irradiated 304L and 316L austenitic stainless steels [97], while dopant desegregation due to increasing temperature has been observed in nanocrystalline Ag-W [42].…”

Section: Discussionmentioning

confidence: 99%

Amorphous intergranular films mitigate radiation damage in nanocrystalline Cu-Zr

et al. 2020

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Nanocrystalline metals are promising radiation tolerant materials due to their large interfacial volume fraction, but irradiation-induced grain growth can eventually degrade any improvement in radiation tolerance. Therefore, methods to limit grain growth and simultaneously improve the radiation tolerance of nanocrystalline metals are needed. Amorphous intergranular films are unique grain boundary structures that are predicted to have improved sink efficiencies due to their increased thickness and amorphous structure, while also improving grain size stability.In this study, ball milled nanocrystalline Cu-Zr alloys are heat treated to either have only ordered grain boundaries or to contain amorphous intergranular films distributed within the grain boundary network, and are then subjected to in situ transmission electron microscopy irradiation and ex situ irradiation. Differences in defect density and grain growth due to grain boundary complexion type are then investigated. When amorphous intergranular films are incorporated within the material, fewer and smaller defect clusters are observed while grain growth is also limited, leading to nanocrystalline alloys with improved radiation tolerance.

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Anisotropic radiation-induced segregation in 316L austenitic stainless steel with grain boundary character

Cited by 82 publications

References 52 publications

Tracking the evolution of intergranular corrosion through twin-related domains in grain boundary networks

Tracking the evolution of intergranular corrosion through twin-related domains in grain boundary networks

Defect sink characteristics of specific grain boundary types in 304 stainless steels under high dose neutron environments

Amorphous intergranular films mitigate radiation damage in nanocrystalline Cu-Zr

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