霍苗,赵惠,张可人.镍基单晶高温合金对接平台内的微观组织及缺陷形成[J].精密成形工程,2022,14(9):86-91.
HUO Miao,ZHAO Hui,ZHANG Ke-ren.Microstructure and Defect Formation in Rejoined Platforms of Ni-based Single Crystal Superalloy[J].Journal of Netshape Forming Engineering,2022,14(9):86-91. |
| 镍基单晶高温合金对接平台内的微观组织及缺陷形成 |
| Microstructure and Defect Formation in Rejoined Platforms of Ni-based Single Crystal Superalloy |
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| DOI：10.3969/j.issn.1674-6457.2022.09.012 |
| 中文关键词: 单晶高温合金 抽拉速率 微观组织 缺陷形成 |
| 英文关键词: single crystal superalloy withdrawal rates microstructure defect formation |
| 基金项目:国家自然科学基金(5210011310);陕西省自然科学基础研究计划(2021JQ–604，2021JM–403);陕西省教育厅科研计划(21JC027);西安市科技计划(2020KJRC0100) |
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| 中文摘要: |
| 目的 针对喷嘴导叶和双联导叶等对接结构单晶铸件内容易产生凝固缺陷的问题，研究定向凝固过程中对接平台内枝晶的生长行为、取向演化和凝固缺陷形成机制。方法 在不同抽拉速率下制备具有对接结构的镍基单晶高温合金铸件，采用实验与ProCAST有限元模拟相结合的方法，研究抽拉速率对镍基单晶高温合金对接平台内微观组织的影响，分析平台内凝固缺陷的形成机理。结果 当抽拉速率较低时，平台内枝晶生长规则，基本无凝固缺陷;随着抽拉速率的增大，平台内枝晶出现严重的侧向生长;当抽拉速率达到150 μm/s时，平台中间区域形成了碎断枝晶缺陷。结论 平台内枝晶生长与局部的温度场分布密切相关，而碎断枝晶的形成可能是由平台内部溶质富集引起的。 |
| 英文摘要: |
| The work aims to research the growth behavior, orientation evolution and solidification defect formation mechanism of dendrite in the rejoined platforms during directional solidification to solve the problem that it is prone to form solidification defects in single crystal castings with rejoined structure such as nozzle guide vanes and double guide vanes. Ni-based single crystal superalloy castings with rejoined structure were prepared under different withdrawal rates. The effects of withdrawal rates on the microstructure in the rejoined platforms of Ni-based single crystal superalloy was investigated by combining experiments and ProCAST finite element simulation. The formation mechanism of solidification defects in the platforms was analyzed. At low withdrawal rates, the dendrites in the platforms were regular and free from solidification defects. With the increase of withdrawal rates, serious lateral growth of dendrites occurred in the platforms. At the withdrawal rate of 150 μm/s, fragmented grains formed in the middle regions of the platforms. The dendrite growth in the platforms is closely related to the local thermal field distribution. The formation of fragmented grains may be caused by the solute enrichment in the platforms. |
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