2:00 PM - 2:20 PM [J46] Deformation behavior of ultrafine-grained austenitic steel at low temperatures *Stefanus Harjo1, Wenqi Mao2, Tatsuya Ito3, Wu Gong4, Takuro Kawasaki5, Si Gao6 (1. JAEA, 2. JAEA, 3. JAEA, 4. JAEA, 5. JAEA, 6. Kyoto Univ.)