在具有不同参数的TiAl合金的定向化过程中温度场分布的数值模拟
Feng Huang1,2, Yeyu Hu1, Jiaguo Xu1
1Hubei Key Laboratory of Advanced Technology of Automotive Components, Wuhan University of Technology, Wuhan 430070, China.
Materials (Basel, Switzerland)
|April 24, 2025
概括
这项研究优化了对- (TiAl) 柱状晶体的双向温度梯度定向化过程. 确定了最佳参数来控制阿尔法相区,以改善晶体生长.
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是金工业的一个方面.
- 晶体的成长 晶体的成长
背景情况:
- - (TiAl) 合金对于高温应用至关重要.
- 生长高质量的TiAl柱状晶体需要精确控制热环境.
- 定向化是控制固化和微观结构发展的关键技术.
研究的目的:
- 为TiAl柱状晶体生长提出和研究双向温度梯度定向化 (BTDGDA) 过程.
- 通过数值模拟和分析结构和工艺参数对TiAl棒内的温度分布的影响.
- 确定最佳参数,以实现理想的α相区和晶体生长温度梯度.
主要方法:
- 在BTDGDA期间,在TiAl棒中进行热传递和温度场的数值模拟.
- 结构参数的系统变化:石墨环厚度 (b),间隙宽度 (d),石墨棒长度 (l) 和距离冷却液的高度 (h).
- 分析过程参数,包括加热温度和绘制速度.
主要成果:
- 减少石墨环厚度 (b) 和间隙宽度 (d) 平面化并扩大了α相区.
- 从冷却液 (h) 增加石墨棒的长度 (l) 和高度也扩大了阿尔法相区的边界,但降低了温度梯度.
- 确定了最佳参数:b=10毫米,d=5毫米,l=50毫米,h=50毫米. 1375°C的加热温度是有利的.
- 绘制速度显著影响微观结构,但对温度场的影响很小.
结论:
- 通过优化参数的BTDGDA工艺,可以控制TiAl柱状晶体的生长.
- 结构参数显著影响阿尔法相区形态和温度梯度.
- 进一步的绘制速度的实验优化是必要的,以完善最终的合金微观结构.
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