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NiTiHf合金的LPBF可加工性:系统建模和单轨研究

Hediyeh Dabbaghi¹, Mohammad Pourshams¹, Mohammadreza Nematollahi¹

¹Department of Mechanical, Manufacturing, and Industrial Engineering, University of Toledo, Toledo, OH 43606, USA.

Materials (Basel, Switzerland)

|August 29, 2024

概括

这项研究探讨了NiTiHf高温形状记忆合金 (HTSMA) 的激光粉床融合 (LPBF),确定了无固化裂纹的可加工窗口. 这些发现提高了对极端环境应用的理解.

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
金工业是金工业的一个方面.

背景情况:

高温形状记忆合金 (HTSMA) 具有极端环境的潜力.
关于使用激光粉床融合 (LPBF) 处理它们的可加工性,研究有限.
固化裂变是这些合金的LPBF的主要挑战.

研究的目的:

为了研究不同含量的NiTiHf合金的打印性 (1,2,15,20度). %) 使用LPBF.
在LPBF过程中识别和减轻固化裂纹.
为NiTiHf HTSMAs建立一个可处理性窗口.

主要方法:

使用Thermo-Calc/2022a进行计算建模,以计算固化裂变易感性 (Kou的指数,Scheil-Gulliver模型).
使用无粉末激光再炼方法对NiTiHf块进行实验验证.
对合金组成对印刷能力的影响的分析.

主要成果:

确定不同NiTiHf成分的固化裂变易感性.
开发了一种无粉末激光再炼技术,用于过程验证.
在各种LPBF条件下 (激光功率,扫描速度) 建立了一个无裂纹可能性的可处理性窗口.

结论:

这项研究提供了关于NiTiHf HTSMAs通过LPBF的可处理性的关键见解.
确定了影响固化裂变的关键因素.
建立的可加工窗口有助于在先进的工程应用中使用这些合金.

关键词:

计算建模计算建模高温形状记忆合金 (HTSMA) 是一种激光粉床聚变 (LPBF) 是一个激光再化的实验激光再化的实验可处理性评估的评估可处理性评估固化裂纹裂纹固化裂纹裂纹

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