热处理温度与冷却速度对热辗扩成形Q345E钢风电法兰中带状组织的影响

发布时间：2018-05-03 00:33

本文选题：QE钢 + 带状组织　；参考：《塑性工程学报》2016年06期

【摘要】：以热辗扩成形Q345E大型风电法兰中的带状组织为研究对象,通过对含带状组织Q345E钢试样分别在不同温度、不同冷却速度下进行热处理,应用光学显微镜与扫描电镜对不同条件热处理后材料的组织、成分进行了分析,并从温度及冷却速度对碳原子扩散距离的影响出发,探讨了二者对带状组织的影响机制。研究结果表明,提高冷却速度可以减轻带状组织,当冷却速度大于临界冷却速度1.3℃·s-1时带状组织消失。热处理温度对Q345E钢带状组织的影响规律性不强,然而其对材料晶粒度的影响明显。综合考虑热处理温度及冷却速度对碳原子扩散的协同作用,当处理温度为880℃、冷却速度为1.5℃·s-1时带状组织消失,且材料组织均匀,晶粒度为9级,升高热处理温度组织会不断粗化。
[Abstract]:The band structure of Q345E large wind flanges formed by hot rolling was used as the research object. Through the heat treatment of Q345E steel samples containing banded microstructure at different temperatures and different cooling rates, the composition and composition of the materials were analyzed by optical microscope and scanning electron microscope, and the temperature and cooling speed were analyzed. The effect of degree on the diffusion distance of carbon atoms is discussed, and the influence mechanism of the two groups on the band structure is discussed. The results show that the band structure can be reduced by increasing the cooling rate. When the cooling rate is higher than the critical cooling rate at 1.3. S-1, the band structure disappears. The effect of heat treatment temperature on the band structure of Q345E steel is not strong, but the effect of the heat treatment is not strong. The effect of the grain size is obvious. Considering the synergistic effect of heat treatment temperature and cooling rate on the diffusion of carbon atoms, the band structure disappears when the temperature is 880 C and the cooling rate is 1.5. S-1. The structure of the material is uniform, the grain size is 9, and the heat treatment temperature group will be coarsened continuously.

【作者单位】：太原科技大学材料科学与工程学院;
【基金】：太原市科技资助项目(120224)
【分类号】：TG142.1;TG161

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