1. Graduate Institute of Ferrous Technology, POSTECH, 790-784 Pohang, Korea
2. Department of Materials Science and Engineering, POSTECH, 790-784 Pohang, Korea
3. Department of Materials Science and Engineering, Seoul National University, 151-744 Seoul, Korea
4. Plate Research Group, Technical Research Laboratories, POSCO, 790-785 Pohang, Korea
5. Center for Advanced Aerospace Materials, POSTECH, 790-784 Pohang, Korea