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主要通过实验室模拟工业罩式退火工艺,研究不同退火温度对Q235冷轧板的组织与性能的影响。通过光学显微镜观察不同退火温度下铁素体的晶粒长大情况,结果显示:晶粒尺寸随退火温度升高而增加,当退火温度在600～640℃时,横向尺寸长大较缓慢。通过透射电镜观察析出物的形貌并进行物相分析,知析出物为渗碳体。统计析出物在不同退火温度下的尺寸和分布情况。最后通过单向拉伸试验测定伸长率、屈服强度和抗拉强度。
Mainly through laboratory simulation of industrial hood annealing process, the effect of different annealing temperature on Q235 cold-rolled sheet microstructure and properties. The grain growth of ferrite at different annealing temperatures was observed by light microscopy. The results showed that the grain size increased with the increase of annealing temperature. When the annealing temperature was 600 ~ 640 ℃, the size of the grain grew more slowly. The morphology of the precipitates was observed by transmission electron microscopy and the phase analysis was performed to find that the precipitates were cementite. The size and distribution of precipitates at different annealing temperatures were calculated. Finally, the elongation, yield strength and tensile strength were measured by one-way tensile test.