Microstructure and mechanical behavior of neutron irradiated ultrafine grained ferritic steel

Alsabbagh, Ahmad; Sarkar, A.; Miller, Brandon; Burns, Jatuporn; Squires, Leah N.; Porter, David; Cole, James I.; Murty, K. Linga

doi:10.1016/j.msea.2014.07.070

Cited by 28 publications

(9 citation statements)

References 42 publications

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“…However, the data on the effect of high-dose neutron irradiation on stability of commercial nanostructured materials in the environment of real reactors are poorly presented in the literature. The first publications in this area were focused on the 321 stainless steel produced by ECAP [219] and low-carbon steel produced by ECAP-C [220,221]. In [219], a study of ECAP 321 steel before and after the neutron irradiation at temperature *350°C in the reactor BOR-60 with the maximum damage dose 5.3 dpa was carried out.…”

Section: Irradiation Resistance Of Bulk Nanostructured Metallic Matermentioning

confidence: 99%

“…However, the steel after ECAP was characterized by a rather wide distribution of grain sizes and substructures, so a conclusion of further studies to clarify and explain the observed regularities was drawn. Studies in [220,221] focused on steel 10 produced by ECAP-C, which was subjected to neutron irradiation with the maximum dose of 1.37 dpa. High number densities of nano-Mn-Si-enriched precipitates were observed in both coarse-grained and UFG steels after irradiation (Fig.…”

Section: Irradiation Resistance Of Bulk Nanostructured Metallic Matermentioning

confidence: 99%

“…Up to date, radiation resistance investigations of bulk nanostructured materials have been just started, but have already demonstrated promising results and [221] with the permission from the publisher important tendency in enhancing a radiation tolerance of metals by their nanostructuring. The origin and physical background of radiation-resistant behavior of bulk nanostructured materials is a primary task to be investigated for establishing a scientific fundament to improve essentially radiation-resistant properties of commercial alloys used in energy industry.…”

Section: Irradiation Resistance Of Bulk Nanostructured Metallic Matermentioning

confidence: 99%

“…3.33 Engineering stress-engineering strain curves for UFG a and CG b steel before and after irradiation to 1.37 dpa. The figure is reproduced from [221] with the permission from the publisher applications is a topical task for modern materials science with attention to both effectiveness and security of the cutting-edge technologies and ecological security taking into consideration risks of global warming and industrial disasters. The problem of utmost importance is development of new functional materials with reasonable corrosion resistance to be used in new-generation applications.…”

Section: Corrosion Resistancementioning

confidence: 99%

See 3 more Smart Citations

Multifunctional Properties of Bulk Nanostructured Metallic Materials

Sabirov

Enikeev

Murashkin

et al. 2015

Bulk Nanostructured Materials With Multifunctional Properties

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This chapter focuses on multifunctional properties of bulk nanostructured metallic materials and structure-properties relationship therein. The most important structural factors affecting mechanical, physical, and chemical properties of the nanomaterials are discussed, and the strategies to their further improvement are outlined. Special attention is paid to nanostructural design for simultaneous improvement of mutually exclusive properties. Superstrength and Enhanced Mechanical PropertiesAlthough the mechanical and functional properties of all polycrystalline metallic materials are determined by several factors, the grain size of the material generally plays the most significant and often a dominant role. Thus, the strength of different polycrystalline materials is related to the grain size, d, through the Hall-Petch equation which states that the yield stress, σ y , is given bywhere σ o is termed the friction stress and k y the Hall-Petch constant [1,2]. It follows from Eq. 3.1 that the strength increases with a reduction in the grain size and this has led to an ever-increasing interest in fabricating materials with extremely small grain sizes. The fabrication of bulk samples and billets using equal channel angular pressing (ECAP), high pressure torsion (HPT), and other severe plastic deformation (SPD) techniques was a crucial first step in initiating investigations into the properties of bulk nanomaterials because the use of SPD processing permitted, and subsequently fully supported, a series of systematic studies using various nanostructured metallic materials including commercial alloys [3][4][5][6][7][8]

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Section: Irradiation Resistance Of Bulk Nanostructured Metallic Matermentioning

confidence: 99%

Section: Irradiation Resistance Of Bulk Nanostructured Metallic Matermentioning

confidence: 99%

Section: Irradiation Resistance Of Bulk Nanostructured Metallic Matermentioning

confidence: 99%

Section: Corrosion Resistancementioning

confidence: 99%

See 2 more Smart Citations

Multifunctional Properties of Bulk Nanostructured Metallic Materials

Sabirov

Enikeev

Murashkin

et al. 2015

Bulk Nanostructured Materials With Multifunctional Properties

View full text Add to dashboard Cite

show abstract

“…The overall structural stability of SPD-introduced features depends strongly on material composition and fabrication. The first neutron irradiation experiments on ECAPed low carbon steel [29,30] and ECAPed 321 stainless austenitic steel [31] demonstrated the potential to produce more radiation-tolerant materials for fission reactor environments.…”

Section: Introductionmentioning

confidence: 99%

Effect of self-ion irradiation on the microstructural changes of alloy EK-181 in annealed and severely deformed conditions

Aydoğan

Chen

Gigax

et al. 2017

Journal of Nuclear Materials

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Nanostructured Fe–Cr–W Steel Exhibits Enhanced Resistance to Self‐Ion Irradiation

et al. 2020

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Ferritic/martensitic steels based on the Fe-Cr system are attractive for nuclear engineering applications due to high strength, low swelling, and good thermal stability. [1] Additional capacity to enhance the radiation tolerance together with mechanical performance of engineering alloys can be realized by microstructure design via different approaches to increase the density of internal sinks for radiation-induced point defects. [2,3] Nanostructuring techniques based on severe plastic deformation are able to produce bulk fine-grained samples of metals and alloys with enhanced multifunctional properties (strength, conductivity, biocompatibility, corrosion resistance, shape memory effect, fatigue properties, and so on), [4] which makes them attractive for innovative applications (for medicine, energy, automotive industries, and so on), [5] in particular, for those requiring advanced materials with elevated radiation tolerance. [3] The aim of this work was to explore the potentiality of this approach to expand the limits of radiation tolerance enhancement of steels of the Fe-Cr system. Recently, we showed that in a model Fe-Cr-W alloy, it is possible to reduce grain size down to about 100 nm using severe plastic deformation by high-pressure torsion, which resulted in a significant enhancement of mechanical performance. [6] One may then expect that such microstructure refinement would also improve the radiation tolerance due to the enhanced defect annihilation rate provided by the drastically increased number of grain boundaries. This is an important task for the alloys of a Fe-Cr system because Cr is known to suppress swelling and at the same time to increase the defect accumulation rate induced by irradiation [7] that provides high radiation strengthening together with significant reduction in ductility of irradiated alloys down to embrittlement at high Cr concentration (18 wt%). [8] This article features the results of a study undertaken to evaluate the effect of ion irradiation in a Fe-14Cr-1W (wt%) steel with different grain sizes. As it has been already reported in our previous publication, [6] high-pressure torsion (HPT) of a Fe-14Cr-1W steel with an initial grain size of 5 μm provided severe microstructure refinement to a mean grain size of 110 nm with an aspect ratio of about 2 (165 Â 70 nm). The fraction of low-angle grain boundaries did not exceed 20%. As a result, the mechanical performance was dramatically enhanced. The microhardness was notably increased (from 230 to 640 Hv); the yield stress changed from 270 to 1670 MPa and ultimate tensile stress from 530 to 1885 MPa. [6] In frames of this study, the same two states of Fe-Cr-W steel with different grain sizes were subjected to self-ion irradiation to a damage dose of 10 dpa at a temperature of 400 C. Following the research by Aydogan et al., [9] it is critical to ensure the stability of microstructure under irradiation conditions; otherwise recovery processes of the nanostructured state would interfere with accumulation of point defects and lead to fa...

show abstract

Microstructure and mechanical behavior of neutron irradiated ultrafine grained ferritic steel

Cited by 28 publications

References 42 publications

Multifunctional Properties of Bulk Nanostructured Metallic Materials

Multifunctional Properties of Bulk Nanostructured Metallic Materials

Effect of self-ion irradiation on the microstructural changes of alloy EK-181 in annealed and severely deformed conditions

Nanostructured Fe–Cr–W Steel Exhibits Enhanced Resistance to Self‐Ion Irradiation

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