工艺参数和合金组成对单晶基超合金中错误导向eutectics的影响
Tobias Wittenzellner1, Shieren Sumarli2, Zijin Dai1
1Foundry Institute, RWTH Aachen University, 52072 Aachen, Germany.
Materials (Basel, Switzerland)
|June 28, 2023
概括
在以为基础的超级合金中优化冷却速度和合金组成可以防止错误的微观结构. 这项研究详细介绍了冷却如何影响核和生长,这对于无缺陷单晶造至关重要.
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.
- 晶体学 晶体学是指结晶学.
背景情况:
- 单晶中的错误导向的微观结构来自工艺参数和合金组成之间的复杂相互作用.
- 了解核和生长机制对于控制固化缺陷至关重要.
研究的目的:
- 调查冷却速度对无碳和含碳基超合金中误导微结构的形成的影响.
- 识别导致固化缺陷的工艺参数和合金组成.
主要方法:
- 在工业和实验室条件下使用布里奇曼和布里奇曼-斯托克巴格造技术.
- 分析了六种不同的合金组成,不同的冷却速率,温度梯度和退出速率.
主要成果:
- 欧特克斯通过残留融中的同质核形成,呈现出随机的晶体学方向.
- 在含有碳的合金中,eutectic 在碳化物上核化,特别是在高碳含量和低冷却速度的情况下.
- 由碳化物中残留的融封闭形成的微流浪颗粒,导致误导的eutectics.
结论:
- 确定了关键的工艺参数 (冷却速率,合金组成),导致错误的微观结构.
- 优化这些参数可以防止基超级合金的固化缺陷.
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