Three-dimensional reconstruction of grain structure of a 0.2%C unalloyed  steel annealed at different temperatures

doi:10.13251/j.issn.0254-6051.2024.08.042

Abstract

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.

Key words: steel, serial cross-sectioning, three-dimensional reconstruction, annealing, image segmentation, grain morphology

CLC Number:

TG111.7

Li Zihao, Huang Suxia, Zhang Bohan, Li Hezong, Cao Chenglong, Zhao Jinsong. Three-dimensional reconstruction of grain structure of a 0.2%C unalloyed steel annealed at different temperatures[J]. Heat Treatment of Metals, 2024, 49(8): 248-253.

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Three-dimensional reconstruction of grain structure of a 0.2%C unalloyed steel annealed at different temperatures

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