1. 1) K. Nakai, T. Sakamoto, R. Asakura, Y. Kotani, N. Isomura, S. Kobayashi, M. Hamada and Y. Komizo: ISIJ International, 51 (2011), 274-279.
2. 2) M. Hamada, S. Okaguchi, Y. Komizo, A. Yamamoto, N. Takahashi, T. Ikeda and I. Takeuchi: Proc. of 4th Intern. Conf. on Pipeline Technology, Ostend, Belgium, (2004), 1077-1088.
3. 3) S. Konishi, K. Nakai, T. Sakamoto, K. Nakai and S. Kobayashi: Materials Science Forum, 783-786 (2014), 932-937.
4. 4) S. Morito, H. Tanaka, R. Konishi, T. Furuhara and T. Maki: Acta Mater, 51 (2003), 1789-1799.
5. 5) K. Nakai, S. Konishi, T. Sakamoto and S. Kobayashi: Materials Science Forum, 783-786 (2014), 926-931.