Establishment of microstructure model of welded joint based on improved VORONOI diagram method
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摘要: 为了从微观尺度研究焊接接头的疲劳裂纹萌生过程，对传统的Voronoi图法进行改进，建立了焊接接头焊缝区柱状晶及细、粗等轴晶混合晶区的微观组织模型. 首先依据金相试验结果将焊缝区划分不同微观区域，通过控制不同微区种子点的密度和位置生成等轴晶及柱状晶微观组织模型，再通过布尔运算合并微区，建立焊缝区混合晶区微观组织模型. 结果表明，该方法建立的焊接接头微观组织模型与真实组织有较高的相似性，将该模型应用于GH4169电子束焊接头疲劳裂纹萌生过程模拟，取得了较好的效果.Abstract: In this study, the traditional Voronoi diagram method was improved, and the microstructure model of columnar crystals and fine and coarse equiaxed mixed crystal structure of the weld zone was established to study the fatigue crack initiation process of micro-scale weld joints. Firstly, the weld zone was divided into different microscopic zone according to the results of metallographic experiments. Then the microstructure model of the mixed crystal zone was created by controlling the density and position of the seed points in different micro zones. Finally, the microstructure model of the integral weld zone was merged by Boolean operation. The results show that the microstructure model of the weld joint established by this method has a high similarity with the real structure. The model is applied to the simulation of the fatigue crack initiation process of the GH4169 electron beam welded joint, which show good agreement with the experimental results.
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Keywords:
- welded joint /
- microstructure /
- Voronoi diagram method /
- fatigue crack initiation
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图 1 Voronoi图构建
Figure 1. Voronoi diagram construction. (a) define discrete points; (b) connect triangle mesh; (c) partition the Voronoi diagram
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图 3 Voronoi图法生成的等轴晶模型
Figure 3. Equiaxed crystal model generated by Voronoi diagram method
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图 4 GH4169电子束焊接头典型宏观形貌
Figure 4. Typical macro morphology of GH4169 electron beam welding joint
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图 5 焊接接头不同区域微观组织
Figure 5. Microstructure metallography of different positions of welded joints. (a) zone of point A; (b) zone of point B; (c) zone of point C; (d) zone of point D
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图 6 柱状晶生成模型
Figure 6. Columnar crystal formation model. (a) divide rectangles; (b) create columnar grains
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图 8 分区建模示意图
Figure 8. Schematic diagram of zoning modeling. (a) fusion zone; (b) heat affected zone; (c) base material
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