张敏,王子熙,刘晨阳,等.Ti–43Al合金薄板连铸过程的数值模拟及微观组织预测[J].精密成形工程,2022,14(7):130-135.
ZHANG Min,WANG Zi-xi,LIU Chen-yang,et al.Numerical Simulation and Microstructure Prediction in Continuous Casting Process of Ti-43Al Alloy Sheet[J].Journal of Netshape Forming Engineering,2022,14(7):130-135. |
| Ti–43Al合金薄板连铸过程的数值模拟及微观组织预测 |
| Numerical Simulation and Microstructure Prediction in Continuous Casting Process of Ti-43Al Alloy Sheet |
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| DOI：10.3969/j.issn.1674-6457.2022.07.018 |
| 中文关键词: Ti–Al合金 连续铸造 数值模拟 微观组织 |
| 英文关键词: Ti-Al alloy continuous casting numerical simulation microstructure |
| 基金项目:国家级大学生创新创业训练计划(200260) |
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| 中文摘要: |
| 目的 研究真空条件下Ti–43Al合金在连铸过程中的传热特性及其微观组织特点。方法 通过ProCAST铸造仿真软件，基于非稳态连铸计算模型建立了连铸过程的温度场模型，获得了连铸板材在凝固过程中的温度场及其固相率的分布规律，并采用CAFE计算模块对连铸板材的微观组织结果进行了预测。结果 连铸坯表面与结晶器接触的位置温度下降速度较快，熔池的深度在整个连铸过程中处在较为合理的水平上;连铸板材两侧表面的细晶区非常狭窄，并形成了由板材表面向板材心部生长的柱状晶区，在靠近铸件心部的位置发生了CET转变。结论 越靠近铸坯心部，温度梯度和过冷度越小，越有利于发生CET转变，使铸坯由外生长转变为内生长。数值模拟预测所得的结果与验证实验结果吻合得较好。 |
| 英文摘要: |
| The work aims to study the heat transfer and microstructure characteristics of Ti-43Al alloy during vacuum continuous casting. The temperature field model of continuous casting process was established based on the unsteady continuous casting calculation model through ProCAST casting simulation software, and the distribution law of temperature field and solid phase ratio of continuous casting sheet during solidification was obtained. The microstructure of the continuous casting sheet was predicted by CAFE calculation module. The temperature at the contact position between surface of continuous casting blank and mold dropped rapidly, and the depth of molten pool was at a reasonable level during the whole continuous casting process. The fine crystal zone on both sides of the continuous casting sheet was very narrow, the columnar crystal zone growing from the sheet surface to the center of the sheet was directly formed, and the CET transition occurred near the center of the casting. The closer to the center of the casting blank, the smaller the temperature gradient and undercooling, and the more favorable it is for CET transition, which makes the casting blank grow from outside to inside. The predicted results of numerical simulation are in good agreement with the experimental results. |
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