利用double-hit实验与场发射扫描电镜定量研究了低碳高铌钢(0.032%C-0.089%Nb, HTP钢)粗晶奥氏体(约800 μm)中的形变诱导Nb(C, N)析出规律. 结果表明, 在1000—900℃温度区间变形时,随着形变温度的降低, 析出开始(5%析出量)时间逐渐缩短, 析出开始时间与温度关系曲线具有C曲线的特征. 随着形变温度的降低, 析出相颗粒密度逐渐增加而颗粒直径减小, 析出动力学满足修正的Avrami方程, Avrami指数约为1.1. 出相主要在位错及位错结等位置优先形核, 形成条带状或网状. 拟合得到的模型能够预测奥氏体低碳高铌钢中的析出开始时间及析出动力学.
Quantitative analysis of strain-induced NbCN precipitates in a low-carbon high-Nb microalloyed steel with coarse grained austenite was investigated by applying double-hit tests and SUPRA55 field emission microscopy. The results have shown that the precipitation-start time adopts the C curve form. When deformed and held at 1000℃～900℃, the particle number density increases while particle diameter decreases with decreasing of deformation temperature. The precipitation kinetics obeys the modified Avrami equation and the Avrami exponent is about 1.1. The models developed in this experiment predict the precipitation-start time and precipitation kinetics well.
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