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| 电磁搅拌作用下CoCrMo合金熔模铸件凝固细晶研究 |
| Grain Refinement of Solidification Structure of CoCrMo Alloy Investment Castings under Electromagnetic Stirring |
| Received:August 22, 2023 |
| DOI：10.3969/j.issn.1674-6457.2023.10.006 |
| 中文关键词: 熔模铸造 CoCrMo合金 晶粒细化 电磁搅拌 数值模拟 |
| 英文关键词: investment casting CoCrMo alloy grain refinement electromagnetic stirring numerical simulation |
| 基金项目:国家自然科学基金(52271034，51974183);云南省材料基因工程Ⅱ期(202302AB080020);上海市自然科学面上基金(22ZR1425000) |
| Author Name | Affiliation | | DAN Ze-yu | Center for Advanced Solidification Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China | | ZHAO Jiang-tao | Center for Advanced Solidification Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China | | LI Yan-hua | Wuxi CastPro Precision Co., Ltd., Jiangsu Wuxi 214105, China | | DENG Yuan-xin | Wuxi CastPro Precision Co., Ltd., Jiangsu Wuxi 214105, China | | ZHANG Yun-hu | Center for Advanced Solidification Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China | | SONG Chang-jiang | Center for Advanced Solidification Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China |
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| 中文摘要: |
| 目的 研究电磁搅拌对CoCrMo合金熔模铸件晶粒尺寸的影响，解决熔模铸造CoCrMo合金铸件晶粒粗大的问题。方法 将CoCrMo合金熔化后，在其凝固过程中分别施加不同工艺参数的电磁搅拌，并对其凝固后的组织进行表征分析。同时，采用有限元法对电磁搅拌在金属熔体中的电磁场和流场进行数值模拟。结果 在不同的电磁搅拌参数下，CoCrMo合金铸件凝固组织出现了不同程度的细晶效果，浇道处的细晶效果优于铸件试棒处的。铸件试棒处的晶粒尺寸最小能控制在1 mm以下，等轴晶率最高能提升至31%。数值模拟结果表明，在电磁搅拌过程中，铸件试棒的磁场、电流和洛伦兹力都呈周期性变化，铸件试棒内部的流速随搅拌时间的延长而增大，最后趋于稳定。结论 电磁搅拌对CoCrMo合金的凝固组织产生了明显的细化效果，促进了柱状晶向等轴晶转变。电磁搅拌的时间越长，铸件凝固组织的细化效果越好，铸件厚大部位的细晶效果越显著。结合实验结果和数值模拟结果发现，在电磁搅拌过程中，熔体流动引发枝晶断裂是晶粒细化的主要原因，而电磁场促进异质形核为次要原因。 |
| 英文摘要: |
| The work aims to study the effect of electromagnetic stirring on the grain size of CoCrMo alloy investment castings, and solve the problem of coarse grain size in investment cast CoCrMo alloy castings. After melting CoCrMo alloy, electromagnetic stirring with different process parameters was applied during its solidification to characterize and analyze its solidified structure. At the same time, the finite element method was used to numerically simulate the electromagnetic field and flow field of electromagnetic stirring in metal melts. Under different electromagnetic stirring parameters, the solidification structure of CoCrMo alloy castings exhibited varying degrees of fine-grained effect, and the fine-grained effect at the runner was better than that at the casting bar. The minimum grain size at the casting bar could be controlled below 1 mm, and the maximum equiaxed grain rate could be increased to 31%. The numerical simulation results indicated that during electromagnetic stirring, the magnetic field, current, and Lorentz force of the casting bar exhibited periodic changes. The internal flow rate of the casting bar increased with the prolongation of stirring time and eventually stabilizes. In conclusion, electromagnetic stirring has a significant refining effect on the solidification structure of CoCrMo alloy, promoting the transformation of columnar grains into equiaxed grains. The longer the electromagnetic stirring time, the better the refinement effect of the solidification structure of the casting. At the same time, electromagnetic stirring has a significant effect on grain refinement in thick areas of castings. Combining experimental and numerical simulation results, it is found that dendritic fracture caused by melt flow during electromagnetic stirring is the main reason for promoting grain refinement, while electromagnetic field promoting heterogeneous nucleation is the secondary reason. |
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