|
|
|
| Research and development of a new hot rolled laminated structure |
| CAO Wen-quan1，XU Hai-feng1,2，ZHANG Ming-da1，DONG Han1，WENG Yu-qing1 |
（1. Institute for Special Steels， Central Iron and Steel Research Institute， Beijing 100081， China
2. College of Materials Science and Engineering， Huazhong University of Science and Technology， Wuhan 430074， Hubei， China） |
|
|
|
|
Abstract In view of energy shortage and high safety requirements， steels with low density， high strength and high toughness have become a hot research topic in material science. A large number of reports show that the Al and other elements alloying can significantly reduce the steel density， and the laminated composite structure greatly improves the toughness of the steel. In this study， based on the introduction of high strength and high toughness steel with equiaxed grains，steel with layered composite and low-density steel at home and abroad，the idea of low density low to medium-alloy design（4%-12%） of Fe-Al-Mn-C dual phase steel and the micro-laminated control by grain shape pancaking of both high temperature delta-ferrite phase and austenite phase during hot rolling process is proposed， which makes it possible to obtain a alternatively arranged micro-laminated composite steel with low density， high strength and high toughness. It is proved that it is feasible to obtain the dual phase steel with low density （6.5-7.5 g/cm3）， micro-laminated， high strength （1 000-1 500 MPa） and high toughness （200-400 J）， which breaks the limitation of toughening mechanism of conventional steel with equiaxial grain structure and opens a new research and development approach for the high strength and high toughness steel. At the end of this paper， a thorough study on the low density and micro-laminated dual phase steel is proposed to understand the relationship between chemical composition， parameters of the micro-laminated structure and the properties of strength and toughness， and to explore the strengthening and toughening mechanism of the new designed low density and micro-laminated dual phase steel， which would indeed open an innovative direction for future research and development on the low density， high strength and high toughness steels.
|
|
Received: 07 March 2016
Published: 29 August 2016
|
|
|
|
|
|
|
2016, Vol. 51 
