(Center for Advanced Structural Materials, Department of Mechanical and Biomedical Engineering,City University of Hong Kong, Hong Kong 999077, China)
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Abstract:
In view of the limited material resources and energy supply available together with serious environment impact concerns at the present time, the development of ultra high strength steels has attracted a great deal of attentions from various countries in the world. As we know, most traditional high strength steels have been developed based on martensitic and bainitic structures with high levels of carbon or high alloy additions. However, these alloys are facing many severe problems, including poor weldability, low ductility and toughness, fabrication size limitation, as well as high production cost, all of these resulting in slowdown of the economic and nationaldefense developments in China.