【摘要】 通过在DIL805热膨胀相变仪上进行连续冷却转变试验，研究了Co微合金化对Fe-C-Si系高碳钢的连续冷却下珠光体相变行为的影响。实验结果表明：Co元素提高了珠光体相变的开始温度，加快了过冷奥氏体向珠光体的转变过程，并扩大了珠光体相变冷速范围。通过动力学计算、衍射峰谱和微观组织分析，发现Co在不同相中的质量分配不同且扩散速率低，抑制了相变时新相的析出和长大，进而细化珠光体片层间距，并观察到在3℃/s的冷速下细化作用最明显。更多还原

【Abstract】 The effect of Co microalloying on the pearlite transformation behavior of Fe-C-Si high carbon steel under continuous cooling was studied through continuous cooling transformation experiments on DIL805 thermal dilatometer. Experimental results show that the starting temperature of pearlite transformation was increased, the transformation process of supercooled austenite to pearlite was accelerated, and the range of pearlite transformation cooling rate was expanded with the addition of Co element. Through the calculation of kinetic, characterization of the spectrum diffraction peak and microstructure, it was found that the mass distribution of Co in different phases is different and the diffusion rate is low, which inhibited the precipitation and growth of new phases during phase transition, and then refined the pearlite interlayer spacing, and it was observed that the thinning effect is the most obvious at the cooling rate of 3℃/s.更多还原