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在Gleeble-1500热模拟机上利用热膨胀法测定Fe-C-Mn-Si-Cr-V系贝氏体钢在不同冷却速度下的连续冷却转变膨胀曲线,根据曲线上的拐点确定相变点。利用ZEISS显微镜观察了不同冷却速度下试样的金相组织,用硬度计测量各试样硬度。结合膨胀曲线和金相组织,利用Origin软件绘制了两种不同成分的Fe-C-Mn-Si-Cr-V系贝氏体钢连续冷却转变曲线(CCT曲线)。结果表明,碳含量的增加降低了贝氏体和马氏体转变温度,设计的两种Fe-C-Mn-Si-Cr-V系贝氏体钢具有良好淬透性。
The continuous cooling transformation expansion curve of Fe-C-Mn-Si-Cr-V bainite steel at different cooling rates was measured by the thermal expansion method on the Gleeble-1500 thermal simulator. The transformation point was determined according to the inflection point on the curve. The microstructure of the samples at different cooling rates was observed with a ZEISS microscope, and the hardness of each sample was measured with a durometer. Combined with swelling curve and microstructure, the continuous cooling transformation curve (CCT curve) of Fe-C-Mn-Si-Cr-V bainite steel with two different compositions was drawn by Origin software. The results show that the increase of carbon content reduces the bainite and martensitic transformation temperature, and the two designed bainitic steels have good hardenability.