【摘要】 为探究20钢在不同退火温度下的晶粒形貌特征，采用系列截面法对20钢晶粒进行了三维重构和几何表征研究。基于132张范围为880μm×390μm的二维金相截面图，分别重构了1100℃和1000℃退火温度下的298个和446个晶粒。确立了一套详细的图像处理及三维重构流程，构建出了三维可视化晶粒模型，该晶粒模型可在三维空间内以任意角度观察其形貌特征，可以获得单个晶粒的体积及表面积。根据等效球体体积法计算晶粒尺寸，并与截线法测得的晶粒尺寸进行了对比。可知，截线法所测得的晶粒尺寸较三维模型等效体积法获得的晶粒尺寸偏大。退火时间相同时，退火温度越高，试样的最大和平均晶粒尺寸越大。更多还原

【Abstract】 In order to investigate the grain characteristics of an unalloyed steel with 0.2%C annealed at different temperatures, the grains were studied by three-dimension(3D) reconstruction and geometric characterization based on serial cross-sectioning(SCS) method. Based on 132 two-dimensional metallographic cross section images with a size of 880 μm×390 μm, 298 and 446 grains of the steel annealed at 1100 ℃ and 1000 ℃, respectively, were reconstructed. A detailed flow of image processing and 3D reconstruction was established, and a 3D visual grain model was constructed. The results show that the 3D model constructed can be viewed at any directions in the 3D space, and the volume and surface area of individual grains can be obtained. The grain size is calculated according to the equivalent sphere volume(ESV) method, and compared with the grain size measured by the intercept method, showing that the grain size measured by the intercept method is larger than that by the ESV method. The higher the annealing temperature, the larger the maximum and average grain sizes of the specimen under the same annealing time.更多还原