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采用高温共聚焦激光扫描电镜(HTCSLM)对Fe-0.15%C-0.8%Mn碳钢连续冷却时先共析铁素体的生长过程进行原位观察和动态追踪,通过对先共析铁素体生长方式和生长方向的分析,以及对先共析铁素体生长速度的定量分析,得到先共析铁素体在奥氏体晶内的生长规律。结果表明:在Mn含量为0.8%的低碳钢连续冷却过程中,先共析铁素体主要以直线方式生长,其生长方向有时发生连续两次大角度偏转,有时发生间断式偏转;不含合金元素的低碳钢中先共析铁素体的生长速度较慢,其平均生长速度为48.79μm/s,添加0.8%Mn元素后,先共析铁素体的生长速度明显加快,其平均生长速度为124.3μm/s。
The growth of pro-eutectoid ferrite during continuous cooling of Fe-0.15% C-0.8% Mn carbon steel was observed and observed dynamically by high-temperature confocal laser scanning electron microscopy (HTC SLM). The precursor eutectoid ferrite Growth pattern and growth direction of the pro-eutectoid ferrite and the quantitative analysis of the growth rate of the pro-eutectoid ferrite. The growth law of the pro-eutectoid ferrite in the austenite crystal was obtained. The results show that the pro-eutectoid ferrite mainly grows in a straight line during the continuous cooling of low-carbon steel with a Mn content of 0.8%. The growth direction of the pro-eutectoid ferrite sometimes occurs in two consecutive large-angle deflections, and intermittent deflections sometimes occur. Alloying elemental low-carbon steel pro-eutectoid ferrite growth rate is slow, the average growth rate of 48.79μm / s, adding 0.8% Mn element, pro-eutectoid ferrite growth rate was significantly accelerated, the average The growth rate was 124.3 μm / s.