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| Effect of temperature on microstructure of microalloyed steel in temperature-reversion deforming process |
| MA Jiang-nan，YANG Cai-fu，WANG Rui-zhen |
| （Department of Engineering Steels， Central Iron and Steel Research Institute， Beijing 100081， China） |
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Abstract The microstructure evolution of microalloyed steel deformed in dual-phase region after heating was studied by single pass thermal-compression simulation. And the effect of heating temperature was analyzed. OM， SEM and EBSD were applied to investigate the microstructure and orientation relationship. The results show that austenite formed at prior grain boundary after heating to different temperature. The fraction of austenite at 740-800 ℃ was about 20%， and it increased sharply to 50% at 830 ℃. Dynamic recovery and dynamic recrystallization took place in the deformed ferrite after heated to dual-phase region. With the increase of temperature， dynamic recovery of deformed ferrite transforms to dynamic recrystallization， which reduced the amount of subgrain. Homogeneous refined ferrite was obtained by deforming at 830 ℃. The fraction of high angle grain boundary reached to 91.2%， and the effective grain diameter was 3.9 μm.
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Received: 08 August 2014
Published: 28 April 2015
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2015, Vol. 50 
