1. 2) J.E.May and D.Turnbull : Trans. Metall. Soc. AIME, 212 (1958), 769.
2. 3) J.Takamura and S.Mizoguchi : Proc. of 6th International Iron and Steel Congress (6th IISC), Vol. I, ISIJ, Tokyo, (1990), 591.
3. 4) Y.Ohno, Y.Okamura, S.Matsuda, K.Yamamoto and T.Mukai : Tetsu-to-Hagané, 73 (1987), 94.
4. 5) C.E.Sims : Trans. Metall. Soc. AIME, 215 (1959), 367.
5. 6) H.Takada, I.Bessho and T.Ito : Tetsu-to-Hagané, 62 (1976), 1319.