Basic thermal–mechanical properties and thermal shock, fatigue resistance of swaged+rolled potassium doped tungsten

Zhang, Xiaoxin; Yan, Qingzhi; Lang, Shaoting; Xia, Min; Chen, Ge

doi:10.1016/j.jnucmat.2014.05.032

Cited by 23 publications

(15 citation statements)

References 32 publications

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“…[8] can be correspondingly applied to the situation of WK82. However, the swaged + rolled W-K sample with similar potassium content (70-75 ppm) showed a cracking threshold of 0.44-0.66 GW/m 2 [29], which is higher than WK82 in this case (<0.37 GW/m 2 ). Taking the difference between swaging and rolling into consideration, the microstructures of these two samples are a little different.…”

Section: Thermal Shock Test Of Traditional Pvs-wk Alloymentioning

confidence: 64%

“…This behavior is determined by a critical aspect ratio of the bubble tubes of 8.89, corresponding to the Rayleigh mechanism for the breakup of cylindrical fluid into spheres [47,48]. In the previous studies that involved the thermal shock behavior of W-K [19,29,31], the deformation degree is not enough for the breakup of big potassium bubbles and the size of the bubbles still remain mostly hundreds nanometers. This means that besides the doped potassium contents, the potassium bubble size is another important factor to influence the thermal shock resistance for W-K alloys.…”

Section: Discussionmentioning

confidence: 99%

“…With respect to WK37 and WK82, the micro-hardness was almost unchanged, which may be ascribed to the grain refinement and potassium bubbles' pinning effect. It also indicates that no recrystallization of WK37 and WK82 occurred during thermal shock tests [29]. …”

Section: Accepted Manuscriptmentioning

confidence: 93%

See 2 more Smart Citations

Effect of potassium doping on the thermal shock behavior of tungsten

Huang

Xiao

et al. 2015

International Journal of Refractory Metals and Hard Materials

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Section: Thermal Shock Test Of Traditional Pvs-wk Alloymentioning

confidence: 64%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of potassium doping on the thermal shock behavior of tungsten

Huang

Xiao

et al. 2015

International Journal of Refractory Metals and Hard Materials

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“…Besides, the cracking threshold of W during transient high heat flux was also influenced by the fabrication history and chemical composition. For example, the cracking threshold at RT and 5 ms pulse duration was <0.15 GW m −2 for the sintered PW and rolled PW [29], 0.25 GW m −2 for the forged PW [30], 0.33-0.35 GW m −2 for the CVD-W, W-TiC [30] and 0.44-0.66 GW m −2 for the W-K [31]. Obviously, the cracking threshold of W was increased by introducing suitable second phase.…”

Section: Thermal Shock Resistance and Mechanismmentioning

confidence: 98%

Thermal shock resistance of tungsten with various deformation degrees under transient high heat flux

Zhang

Zheng

Huang

et al. 2020

Mater. Res. Express

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Tungsten (W) is considered as the most promising plasma facing material in fusion device, which will be exposed to steady and transient heat loads. Usually, the deformation degree of W influences its thermal shock properties. So we evaluated the thermal shock resistance of rolled pure tungsten (PW) with 60%, 90% deformation degrees and W-1.0wt%La 2 O 3 (WL10) with 52%, 88% deformation degrees using electron beam at an absorbed power density of 0.22 GW m −2 for 5 ms and further discussed the relationship between the thermal shock resistance and microstructures, thermalmechanical properties. The absorbed beam current (30 mA), electron beam acceleration voltage (120 kV) and loaded area (4×4 mm 2 ) is used to estimate the absorbed power density. The results indicated that PW-90%, LW-88% exhibited smaller grain size, higher relative density, microhardness but lower strength, thermal conductivity compared to PW-60%, LW-52%. The cracking threshold was <0.22 GW m −2 for PW-60%, LW-52% and >0.22 GW m −2 for PW-90%, LW-88%. Elliptic left pores in PW-60% and LW-52% aggravated the effect of stress concentration cracking during the transient high heat flux test and decreased the cracking threshold altough they exhibited high strength and thermal conductivity.

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“…Usually, W serves in high temperature and may undergo recrystallization. For example, W is considered as the plasma facing material (PFM) in future fusion reactor and will be subjected to intensive heat loads, which will result in the rapid temperature increase of W and further lead to recrystallization and grain growth [4][5][6][7]. Thus the functional and structural performance of W after recrystallization should be concerned.…”

Section: Introductionmentioning

confidence: 99%

Texture evolution of tungsten materials during recrystallization

Zhang¹,

Zheng²,

Huang³

et al. 2020

Mater. Res. Express

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Some functional and structural performance of tungsten (W) are related to its texture characteristics. Usually, W serves in high temperature and may undergo recrystallization. Thus it's necessary to evaluate the recrystallization texture of W. In our previous studies, pure W (PW) and W-1.0wt%La 2 O 3 (WL10) were deformed via unidirectional rolling (UNR), cross rolling (CRR) and clock rolling (CLR) with 80% reduction. In the present paper, PW-UNR, PW-CRR, PW-CLR and WL10-UNR were subjected to annealing at 2073 K for 2 h to achieve recrystallization and figure out the evolution mechanism of recrystallization texture in W materials. Besides, the effect of La 2 O 3 on recrystallization texture of W was discussed. The results indicated that the fiber textures in rolling state were transformed into isolated textures after recrystallization. {001}〈uvw〉 isolated texture formed in the recrystallized W may be mainly resulted from the texture inheritance. {113}〈361〉 isolated texture formed in the recrystallized WL10-UNR may be attributed to the orientated growth of {113}〈361〉 grains with high grain boundary mobility facilitated by La 2 O 3 . Generally, isolated textures near θ-fiber were strengthened while γ-fiber was weakened for W during recrystallization, which is an effective method to achieve W with more {001} and less {111} textures.

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Basic thermal–mechanical properties and thermal shock, fatigue resistance of swaged+rolled potassium doped tungsten

Cited by 23 publications

References 32 publications

Effect of potassium doping on the thermal shock behavior of tungsten

Effect of potassium doping on the thermal shock behavior of tungsten

Thermal shock resistance of tungsten with various deformation degrees under transient high heat flux

Texture evolution of tungsten materials during recrystallization

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