Evaluation of hardening behaviors in ion-irradiated Fe–9Cr and Fe–20Cr alloys by nanoindentation technique

Li, Shilei; Wang, Yanli; Dai, Xianyuan; Liu, Fang; Li, Jinyu; Wang, Xitao

doi:10.1016/j.jnucmat.2016.05.038

Cited by 40 publications

(7 citation statements)

References 24 publications

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“…12, where the FIBirradiated sample showed higher values than the virgin sample. This increase of hardness or embrittlement is observed in metallic materials, including NiAl-Mo alloys [24], tungsten [25] and Fe-Cr alloys [26], after irradiation. This is attributed to the irradiationinduced point defects which act as barriers to dislocation movement.…”

Section: Lower Load Levelmentioning

confidence: 82%

Nanoscale investigation of deformation characteristics in a polycrystalline silicon carbide

et al. 2019

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In this paper, we study the mechanical behaviour of silicon carbide at the nanoscale, with a focus on the effects of grain orientation and high-dose irradiation. Grain orientation effect was studied through nanoindentation with the aid of scanning electron microscopy (SEM) and EBSD (electron backscatter diffraction) analyses. Mechanical properties such as hardness, elastic modulus and fracture toughness were assessed for different grain orientations. Increased plasticity and fracture toughness were observed during indentations on crystallographic planes which favour dislocation movement. In addition, for SiC subjected to irradiation, increases in hardness and embrittlement were observed in nanoindentations at lower imposed loads, whereas a decrease in hardness and an increase in toughness were obtained in nanoindentations at higher loads. Transmission electron microscopy (TEM) analyses revealed that the mechanical response observed at a shallow indentation depth was due to Ga ion implantation, which hardened and embrittled the surface layer of the material. With an increased indentation depth, irradiationinduced amorphization led to a decrease in hardness and an increase in fracture toughness of the material.

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Section: Lower Load Levelmentioning

confidence: 82%

Nanoscale investigation of deformation characteristics in a polycrystalline silicon carbide

et al. 2019

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“…Comparison of the radiation-induced hardening (ΔН, the difference of hardness values of irradiated and unirradiated materials) of ferritic-martensitic steels obtained by different authors [16, [26][27][28][29][30][31][32][33] (Fig. 9) shows some differences in the data, which is probably due, first of all, to the difference in the irradiation temperature.…”

Section: The Enlarged Micrographs Of That In the Box Of Figure (C) Obtained Under The Over-focus Conditionmentioning

confidence: 99%

Effect of Severe Plastic Deformation on Radiation Hardening of T91 Ferritic-Martensitic Steel

Voyevodin¹,

Tolstolutskaya²,

Karpov³

et al. 2021

Problems of Atomic Science and Technology

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Effect of thermomechanical treatment on radiation hardening behavior in T91 ferritic-martensitic steel was evaluated. An applying of severe plastic deformation (SPD) by the “upsetting-extrusion” method and subsequent heat treatment led to a considerable grain refinement, crushing of martensite lamellas, reduction of MX carbides size and their more uniform distribution. Nanoindentation measurements of SPD-modified steel revealed a 1.4-fold increase in the hardness relative to the initial steel. Irradiation response of modified steel was examined after 1.4 MeV Ar+ ion irradiations in the dose range of 10…45 displacements per atom (dpa) at room temperature and 460 °C. Microstructure characterization was performed by means of transmission electron microscopy (TEM). It was found that dislocation loops and nano-sized argon bubbles dominated the damage microstructure after ion irradiation. The effects of SPD-induced transformations as well as nano-bubbles formation are discussed regarding to the hardening phenomenon observed in irradiated steel.

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“…A clear difference can be seen in the ferritic and tempered martensitic materials (data from [13]). Fe-12Cr 320C Hardie et al [8] Fe-9Cr (JLF) 300C Katoh et al [9] Fe-9Cr 300C Heintze et al [10] Eurofer97 300C Heintze et al [10] Fe-9Cr Troom Li et al [11] T91 200C Heintze et al [12] HT9 (ferrit) Troom Hoserman et al [13] HT9 (martensite) Troom Hoserman et al [13] Fe-12Cr 320C Hardie et al [8] Fe-9Cr (JLF) 300C Katoh et al [9] Fe-9Cr 300C Heintze et al [10] Eurofer97 300C Heintze et al [10] Fe-9Cr Troom Li et al [11] T91 200C Heintze et al [12] HT9 (ferrit) Troom Hoserman et al [13] HT9 (martensite) Troom Hoserman et al [13] Fig. 8.…”

Section: Sem Images Showing Deformed Regions Surrounding Indents In Un-irradiated (A B C) and Irradiated (D E F) Regions Corner-to-cornermentioning

confidence: 99%

“…A limited number of previous studies have been performed under fast reactor and low temperature spallation environments [4-6]. Several studies have been performed on the response of mechanical properties of T91 to ion irradiation [7][8][9][10][11][12][13]. The scattered data were obtained for individual values of damage doses, different irradiation temperatures (from room temperature (RT) to 600 °C) and the types and energies of the irradiating particles.…”

Section: Introductionmentioning

confidence: 99%

Effect of Argon Ion Irradiation on Hardening and Microstructure of Ferritic-Martensitic Steel T91

Voyevodin¹,

Tolstolutskaya²,

Karpov³

et al. 2019

Problems of Atomic Science and Technology

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Ferritic-martensitic steel T91 was irradiated with 1.4 MeV Ar+ ions to doses from 0.5 to 7 displacements per atom (dpa) at room temperature. Microstructure characterization was performed using transmission electron microscopy (TEM). TEM observations indicated that black dots and dislocation loops dominated the damage microstructure after ion irradiation. The nanoindentation technique was used to find out the changes in the hardness values with irradiation dose. Nanoindentation tests were performed at room temperature in continuous stiffness measurement mode before and after the irradiation. Nix-Gao model was used to extract the bulk-equivalent nanohardness of specimens. Pile-up of material around the indentation site that affects the calculated contact area was taken into account for correct interpretation of the mechanical properties of the irradiated material. It is shown that ion irradiation leads to hardening by 21% (∆H ~ 0.7 GPa) which reaches quasi saturation at doses ≥1 dpa.

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Evaluation of hardening behaviors in ion-irradiated Fe–9Cr and Fe–20Cr alloys by nanoindentation technique

Cited by 40 publications

References 24 publications

Nanoscale investigation of deformation characteristics in a polycrystalline silicon carbide

Nanoscale investigation of deformation characteristics in a polycrystalline silicon carbide

Effect of Severe Plastic Deformation on Radiation Hardening of T91 Ferritic-Martensitic Steel

Effect of Argon Ion Irradiation on Hardening and Microstructure of Ferritic-Martensitic Steel T91

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