在L-PBF中测量化池的冷却行为,采用高热度测量
Aron Pfaff1, Sebastian Schäffer1, Martin Jäcklein1
1Fraunhofer Institute for High-Speed Dynamics, Ernst-Mach-Institut, Ernst-Zermelo-Str. 4, 79104 Freiburg, Germany.
Materials (Basel, Switzerland)
|May 27, 2023
概括
这项研究使用热量计测量激光粉床聚变 (L-PBF) 的冷却时间. 一种新的装配方法解决了信号扭曲,揭示了冷却时间和材料微观结构之间的相关性.
科学领域:
- 材料科学 材料科学 材料科学
- 添加剂制造 添加剂制造 添加剂制造
- 光学诊断器的光学诊断系统
背景情况:
- 精确的温度测量对于激光粉末床融合 (L-PBF) 过程控制至关重要.
- 了解L-PBF中的冷却动态对于预测材料微观结构和性能至关重要.
- 热量计为在L-PBF期间的现场温度监测提供了一种非接触式方法.
研究的目的:
- 在L-PBF中测量单个激光轨道的冷却持续时间,采用高 pyrometry.
- 为了确定30CrMoNb5-2合金的排放率,以准确测量温度.
- 为了验证一种新的适配方法,用于扭曲的 pyrometer 信号,并分析微观结构的变化.
主要方法:
- 在现场测定30CrMoNb5-2合金的辐射率,使用金相测量和热电偶.
- 在L-PBF系统中验证单色和双色高 pyrometer 精度.
- 应用一种新的信号安装方法来分析单个激光轨道的 pyrometer 数据.
- 融化池微结构的电子反射散射衍射 (EBSD) 分析.
主要成果:
- 30CrMoNb5-2合金的发射率在现场确定,使得准确的温度读数.
- 一种新的装配方法成功地纠正了烟雾和珠引起的信号扭曲.
- 冷却时间与观察到的微观结构特征相关,包括变形和无形化.
- 实验冷却持续时间为验证L-PBF模拟提供了数据.
结论:
- 热量计,与现场辐射度校准和先进的信号处理,是有效的测量冷却时间在L-PBF.
- 测量的冷却持续时间与微观结构演变直接相关,为材料行为提供了洞察力.
- 这些发现有助于改进L-PBF过程控制,模拟验证和微观结构与属性关系研究.
相关概念视频
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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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