Development of Medium and Intermediate Mn Third Generation Automotive Steel Grades
The various medium and intermediate Mn steel concepts which are currently under consideration as possible candidate materials for third generation ultra high strength steel grades for automotive applications are reviewed.These steels display a wide variety of micro-structures and complex processing-dependent mechanical behavior.It is shown that the most promising properties are obtained after annealing in the two phase region.Two types of Mn steel grades can be identified: medium Mn steel grades with a Mn content in the range of 3~8 mass-% and intermediate Mn steel grades with a Mn content in the range of 10~12 mass-%.The micro-structure of medium Mn steel grades can be fully or partially ultrafine grained with grain size less than 500nm.The principles and control of the transformation-induced plasticity effect in medium Mn steel grades are presented.The intermediate Mn steel grades are also characterized by mechanical properties which result from the operation of both the twinning induced plasticity effect and the transformation-induced plasticity.A sustained strain hardening behavior is observed when these two plasticity-enhancing effects occur in sequence.The contribution concludes by pointing to the fact that both cost and manufacturing aspects must an integral part of the selection and development of third generation steel grades.
Automotive steel Strain hardening Medium Mn steel
B.C. De Cooman Seawoong Lee
Institute of Ferrous Technology,Pohang University of Science and Technology,Pohang,South Korea
国际会议
The 2nd International Symposium on Automobile Steel (第二届汽车用钢生产及应用技术国际研讨会)
鞍山
英文
8-14
2013-05-21（万方平台首次上网日期，不代表论文的发表时间）