Nanocrystalline-grained tungsten prepared by surface mechanical attrition treatment: Microstructure and mechanical properties

Guo, Hongyan; Xia, Min; Wu, Zhengtao; Chan, Lap-Chung; Dai, Yong; Wang, Kun; Yan, Qingzhi; He, Manchao; Chen, Ge; J, Lu

doi:10.1016/j.jnucmat.2016.08.032

Cited by 15 publications

(2 citation statements)

References 21 publications

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“…Compared with the untreated sample (Figure 3(b)), the SMAT-processed sample has a larger number of shear bands, indicating the occurrence of severe plastic deformation during the SMAT process. The microstructural evolution and mechanism of grain refinement in 316L SS during SMAT have been discussed in previous studies and are identical to those observed in the present work [7,[19][20][21].…”

Section: Characteristics Of Smat-processed 316l Samplessupporting

confidence: 88%

Effect of surface mechanical attrition treatment on stainless steel corrosion

Ran

Zhang

Wen

et al. 2020

Surface Engineering

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Surface mechanical attrition treatment (SMAT) is a unique method for the nanoscale refinement of a surface grain structure without changing the alloy chemical composition. Herein, the effect of SMAT on the corrosion resistance of 316L stainless steel in artificial sea water used as a corrosive medium has been investigated. As a result, a passive film and a nanostructured layer were formed on the SMAT-processed 316L stainless steel surface, which considerably increased its corrosion resistance during short-term testing. However, after a long-term exposure to the corrosive medium, the treated sample exhibited deterioration of its corrosion properties because of the micro-strain build-up and the presence of defects in the surface layer. The findings of this work suggest that SMAT can be potentially used for providing short-term corrosion protection to stainless steel objects immersed in aqueous saline media.

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Section: Characteristics Of Smat-processed 316l Samplessupporting

confidence: 88%

Effect of surface mechanical attrition treatment on stainless steel corrosion

Ran

Zhang

Wen

et al. 2020

Surface Engineering

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“…For larger samples, obtaining these fine microstructures is more complex and may require processes such as equal channel angular pressing [29,30], cold rolling [31][32][33], surface attrition [34], or even high-pressure torsion [35]. Due to the high forces required in these processes, and the high elastic limit of tungsten, they are unfortunately not appropriate in order to obtain nanostructured plasma-facing components as large as the design of the ITER tokamak requires.…”

Section: Introductionmentioning

confidence: 99%

SHS Synthesis, SPS Densification and Mechanical Properties of Nanometric Tungsten

Dine

Bernard

Herlin

et al. 2021

Metals

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Recent studies have shown that low grain sizes are favorable to improve ductility and machinability in tungsten, as well as a resistance to ablation and spallation, which are key properties for the use of this material in a thermonuclear fusion environment (Tokamaks such as ITER). However, as one of the possible incidents during Tokamak operation is the leakage of air or water from the cooling system inside the chamber, resulting in the so-called loss of vacuum accident (LOVA), extensive oxidation may arise on tungsten components, and the use of an alloy with improved oxidation resistance is therefore highly desirable. As current production routes are not suitable for the fabrication of bulk nanostructured tungsten or tungsten alloys samples, we have proposed a new methodology based on powder metallurgy, including the powder synthesis, the densification procedure, and preliminary mechanical testing, which was successfully applied to pure tungsten. A similar study is hereby presented on tungsten-chromium alloys with up to 6 wt.% Cr. Results show that full tungsten densification may be obtained by SPS at a temperature lower than 1600 °C. The resulting morphology strongly depends on the amount of the alloying element, presenting a possible second phase of chromium oxide, but always keeps a partial nanostructure inherited from the synthesized powders. Such microstructure had previously been identified as being favorable to the use of these materials in fusion environments and for improved mechanical properties, including hardness, yield strength and ductility, all of which is confirmed by the present study.

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SHS Synthesis and SPS Densification of Nanometric Tungsten

et al. 2018

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Recent studies show that low grain sizes are favorable to improve ductility and machinability in tungsten, as well as the resistance to ablation and spallation if this material is to be used in thermonuclear fusion environment. However, current production routes are not suitable for the fabrication of large bulk nanostructured tungsten samples. The authors propose here a new methodology based on powder metallurgy, including the powder synthesis by the reduction of tungsten trioxide by magnesium using the Self-propagating High-temperature Synthesis process in the presence of a reaction moderator, and the densification procedure. Results show that full tungsten densification may be obtained by SPS at a temperature lower than 1800 C and that the resulting morphology, keeping a partial nanostructure inherited from the synthesized powders, seems indeed favorable to the use of these materials in fusion environments.

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Nanocrystalline-grained tungsten prepared by surface mechanical attrition treatment: Microstructure and mechanical properties

Cited by 15 publications

References 21 publications

Effect of surface mechanical attrition treatment on stainless steel corrosion

Effect of surface mechanical attrition treatment on stainless steel corrosion

SHS Synthesis, SPS Densification and Mechanical Properties of Nanometric Tungsten

SHS Synthesis and SPS Densification of Nanometric Tungsten

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