LI Qun, Ph. D, E-mail: liqun1959@ yahoo. com. cn Corresponding: JING Tianfu(1948-), male, professor, Ph. D, research direction: Preparation technology for advanced steel & iron materials with metastable phase; tel: +86 335 8074695; fax: +86 335 8074545. E-mail address: jingtf@ysu. edu. cn