电场作用下预设升温速度对Fe-V-C系燃烧合成的影响

The Effect of Preset Heating Rate on Combustion Synthesis of Fe-V-C System under an Electric Field

采用Gleeble热模拟机研究了预设升温速度对Fe-V-C体系在电场作用下燃烧合成的影响。用X射线衍射仪(XRD)以及扫描电镜(SEM)等研究了试样在不同预设升温速度下的相结构和显微组织。结果表明:在电场作用下,该体系的反应起始温度较低。预设升温速度对体系的影响呈阶段变化,当预设升温速度为600℃/s～1000℃/s时,合成过程以及合成产物的变化不大;当预设升温速度升至1400℃/s时,体系的点火温度降低、点火延迟时间缩短,合成产物颗粒变小,硬度提高。

The effect of preset heating rate on the combustion synthesis of Fe-V-C system under an electric field was investigated using Gleeble thermal simulation apparatus. The phase structure and microstructure of samples under different heating rates were investigated by X-ray diffraction （XRD） and scanning electron microscope （SEM） etc. The results showed that under the effect of electric field, the starting temperature of synthesis reaction was relatively low, on this condition, the effect of preset heating rate on the synthetic process presented a change like stepladder, that is, when the preset heating rates were 600℃/s and 1000℃/s, only a little changes in both the progress and the products took place during the synthesis, and when the preset heating rate was 1400℃/s, the ignition temperature and the delay time decreased, and the sizes of the synthetic products reduced, and the hardness increased.