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| Microstructure and Mechanical Properties of 980 MPa Grade Hot Rolled V-microalloyed TRIP Steel |
| HOU Xiaoying, XU Yunbo, WU Di |
| State Key Laboratory of Rolling Technology & Automation, Northeast University, Shenyang 110819 |
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Cite this article:
HOU Xiaoying XU Yunbo WU Di. Microstructure and Mechanical Properties of 980 MPa Grade Hot Rolled V-microalloyed TRIP Steel. Chin J Mater Res, 2011, 25(2): 158-164.
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Abstract The microstructural characteristics and mechanical properties of a V-microalloyed TRIP steel after hot rolling under laboratory conditions were investigated. The results show that multiphase microstructure with ferrite, granular bainite and retained austenite can be obtained if the finishing temperature is nearby Ae3. EBSD analyses show that 75% or more ferrite grain size is in the range of 1–6 μm; most of the misorientation angles between grains were in the range of 29?–60?. When finishing rolling temperature was 830℃ and final cooling temperature was 650℃, the steel have excellent mechanical properties, the tensile strength arrives at 1015MPa, the elongation rate is 19.5% and strain-hardening exponent is 0.24.
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Received: 22 July 2010
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| Fund: Supported by the Fundamental Research Funds for the Central Universities No.090407001, National Key Project of Scientific and Technical Supporting Programs No.2007BAE51B07 and National Natural Science Foundation of China No.50734001. |
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