| Abstract |
| The present study is aimed at developing the high strength steel plates containing tramp elements. Four kinds of Fe-0.2C-l.5Mn-1,5Si-(Cu, Cr, and Ni) hot-rolled steel plates were prepared, and microstructural observation and tensile tests were conducted, The main emphasis has been placed on understanding the effects of tramp elements (Cu, Cr, and Ni) and the coiling temperature (CT) on microstructures and properties of the hot-rolled steel plates. In the case of coiling at 450℃, the higher volume fractions of retained austenite were obtained than the case of coiling at 400℃, and the tensile elongations and the values of strength-elongation balance were increased owing to the transformation induced plasticity (TRIP). The addition of Ni resulted in a great increase of the retained austenite volume fraction and a discontinuous yielding behavior. On the other hand, the addition of Cr or Cr+Ni showed a dual phase stress strain curve having high tensile strength and low elongation. |
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| Key Words |
| Tramp Elements, High Strength Hot-Rolled Steel Plates, Microstructure, Mechanical Property, Retained Austenite, Transformation Induced Plasticity |
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