V-N微合金钢在低温区动态析出行为

Dynamic Precipitation Behavior of V-N Microalloyed Steel in Low Temperature Region

低碳钢由于碳含量较低,可以减轻碳对钢韧性的不利影响。低碳钢通过控轧控冷工艺得到含高位错密度的贝氏体组织,可以实现相变强化。但单纯依靠一种强化手段其强化效果有限。为进一步提升性能,希望在贝氏体相变强化基础上,引入析出强化机制。通过热模拟试验,结合透射电镜观察,研究了高N含钒微合金钢在贝氏体区的析出行为,得出了不同温度、不同时间下析出体积分数的具体数值、强化贡献量及最佳析出温度,为V-N贝氏体钢开发提供有价值的参考。

The adverse effect of carbon on the toughness of steel can be reduced in low carbon steel. Through controlled roiling and cooling , high dislocation density of bainite carbon steel, and phase transformation strengthening can be achieved. organization was obtained in low However, single reinforcement method has its limitations. It is necessary to introduce precipitation strengthening on the basis of bainite phase transformation su＇engthening. The precipitation behavior of high-nitrogen vanadium micro-alloyed steel in bainite region was investigated by thermal simulation experiment and TEM. The specific values of precipitation volume fraction at different temperatures and time, and the enhancing contribution amount and the optimum precipitation temperature were obtained. It provides valuable reference for the development of V-N bainitic steel.