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.
收稿日期: 2014-08-08
出版日期: 2015-04-28
引用本文:
马江南，杨才福，王瑞珍. 回温变形温度对微合金钢显微组织的影响[J]. 钢铁, 2015, 50(5): 63-68.
MA Jiang-nan，YANG Cai-fu，WANG Rui-zhen. Effect of temperature on microstructure of microalloyed steel in temperature-reversion deforming process. Iron and Steel, 2015, 50(5): 63-68.
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