Effect of hot rolling conditions on the microstructure and mechanical properties of Fe-C-Mn-Si multiphase steels
- Pohang Univ. of Science and Technology (Korea, Republic of)
- POSCO, Pohang (Korea, Republic of). Sheet Products and Process Research Team
There is a growing need for the high strength steels with high formability for many applications. Using the concept of transformation induced plasticity (TRIP) observed in austenitic steels, one can obtain the combination of high strength and high formability. However, these austenitic steels require a fairly large amount of alloying elements which impose several practical problems for their widespread applications. On the other hand, it has been shown that the dual phase steels possess the relatively good combination of strength and formability due to their characteristic microstructure. The major microstructural constituents of dual phase steels are soft ferrite and hard martensite/bainite with small amount of retained austenite. In recent years, the beneficial effect of retained austenite on the mechanical properties of dual phase steels have been re-recognized and accordingly, there have been several investigations on developing the so-called TRIP-aided dual phase steels having increased amount of retained austenite in the microstructure. Most investigations on these TRIP-aided dual phase steels have been concentrated on the effects of heat treatment conditions and alloying elements such as Si, Mn, C and P on the microstructure and mechanical properties of cold rolled sheet steels. There have also been a few studies on developing such steels by hot rolling, and the emphases of these studies are placed mostly on increasing the amount of retained austenite. However, the microstructure of these hot rolled steels is far from optimum, consisting of large packets of hard second phase particles. The main objective of the present study is to modify the microstructure of this class of steels by varying the hot rolling conditions. The steel used in the present study is Fe-0.2C-2Si-1.5Mn.
- OSTI ID:
- 605674
- Journal Information:
- Scripta Materialia, Vol. 38, Issue 5; Other Information: PBD: 3 Feb 1998
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of second phase morphology on warm stretch-flangeability in high strength TRIP-aided dual-phase steel sheets
Effect of deformation in the intercritical area on the grain refinement of retained austenite of 0.4C TRIP steel