| 基于改进Voronoi图法的焊接接头微观组织建模 |
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| 引用本文： | 刘小刚,申顺,朱阳阳. 基于改进Voronoi图法的焊接接头微观组织建模[J]. 焊接学报, 2022, 43(1): 60-66. DOI: 10.12073/j.hjxb.20210515002 |
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| 作者姓名： | 刘小刚 申顺 朱阳阳 |
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| 作者单位： | 南京航空航天大学，航空发动机热环境与热结构工业和信息化部重点实验室，南京，210016 |
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| 基金项目： | 国家科技重大专项(2017-IV-0012-0049)；;中央高校基本科研业务费(NS2021014)； |
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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...
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| 关 键 词： | 焊接接头 微观组织 Voronoi图法 疲劳裂纹萌生 |
| 收稿时间： | 2021-05-15 |
Establishment of microstructure model of welded joint based on improved VORONOI diagram method |
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| Affiliation: | Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China |
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| 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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