[1] Sch. of Mat. Science and Engineering, Inha University, 253 Yonghyun-dong, Nam-ku, Incheon 402-751, Korea, Republic of
[2] R and D Center for Metallurgy, Kia Steel Co. Ltd., 1-6, Soryong-dong, Kunsan 573-711, Korea, Republic of
[3] Plate, Rod and Welding Group, POSCO Tech. Research/Laboratories, 1 Goedong-dong, Nam-ku, Pohang 790-785, Korea, Republic of