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- W3046367279 endingPage "152416" @default.
- W3046367279 startingPage "152416" @default.
- W3046367279 abstract "The lifetime of tungsten (W) monoblocks under fusion conditions is ambivalent. In this work, the microstructure dependent mechanical behaviour of pulsed high heat flux (HHF) exposed W monoblock is investigated. Two different microstructural states, i.e. initial (deformed) and recrystallized, both machined from HHF exposed monoblocks are tested using tensile and small punch tests. The initial microstructural state reveals a higher fraction of low angle boundaries along with a preferred orientation of crystals. Following HHF exposure, the recrystallized state exhibits weakening of initial texture along with a higher fraction of high angle boundaries. Irrespective of the testing methodology, both the microstructural states display brittle failure for temperatures lower than 400∘C. For higher temperatures (>400∘C), the recrystallized microstructure exhibits more ductile behaviour as compared to the initial state. The observed microstructural state-dependent mechanical behaviour is further discussed in terms of different microstructural features. The estimated brittle-to-ductile transition temperature (BDTT) range is noticed to be lower for the recrystallized state as compared to the initial state. The lower BDTT in the recrystallized state is attributed to the high purity of the W in combination with its low defect density, thereby preventing segregation of impurities at the recrystallized boundaries and the related premature failure. Based on this observation, it is concluded that the common opinion of the aggravation of BDTT in W due to recrystallization is not unerring, and as a matter of fact, recrystallization in W could be instrumental for preventing the self-castellation of the monoblocks." @default.
- W3046367279 created "2020-08-07" @default.
- W3046367279 creator A5032289570 @default.
- W3046367279 creator A5049033701 @default.
- W3046367279 creator A5057263022 @default.
- W3046367279 creator A5059908548 @default.
- W3046367279 creator A5071233759 @default.
- W3046367279 date "2020-12-01" @default.
- W3046367279 modified "2023-10-16" @default.
- W3046367279 title "Brittle-ductile transition temperature of recrystallized tungsten following exposure to fusion relevant cyclic high heat load" @default.
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- W3046367279 doi "https://doi.org/10.1016/j.jnucmat.2020.152416" @default.
- W3046367279 hasPublicationYear "2020" @default.