[F1-P204] Poster 204

[F1-P204-14] Fracture toughness evaluation of an ultrahigh-strength steel sheet in air and high-pressure hydrogen-gas

*Naoki Hirakawa¹, Yuya Tanaka², Kaneaki Tsuzaki³, Akinobu Shibata³, Hisao matsunaga Matsunaga¹ (1. Kyushu Univ. (Japan), 2. Fukuoka Univ. (Japan), 3. NIMS (Japan))

キーワード：Ultra-high strength steel, Fracture toughness, Hydrogen embrittlement, Thickness dependence, Crack closure