Recrystallization and grain growth induced by ELMs-like transient heat loads in deformed tungsten samples

• DOI: 10.1038/srep06845
• Publication Date: 2014-11-04T10:13:40Z
• Authors: A. Suslova; O. El-Atwani; D. Sagapuram; S. S. Harilal; A. Hassanein
• Keywords: Recrystallization (geology); Transient (computer programming)

Tungsten has been chosen as the main candidate for plasma facing components (PFCs) due to its superior properties under extreme operating conditions in future nuclear fusion reactors such ITER. One of serious issues PFCs is high heat load during transient events ELMs and disruption reactor. Recrystallization grain size growth PFC materials caused by transients are undesirable changes material, since isotropic microstructure developed after recrystallization exhibits a higher ductile-to-brittle transition temperature which increases with size, lower thermal shock fatigue resistance, mechanical strength an increased surface roughening. The current work was focused on careful determination threshold parameters recrystallization, rate resistance ELM-like events. Transient loads were simulated using long pulse laser beams two different grades ultrafine-grained tungsten. It observed that cold rolled tungsten demonstrated better power handling capabilities stress compared severely deformed Higher threshold, slower degree roughening