| 顾冬冬戴冬华夏木建马成龙.金属构件选区激光熔化增材制造控形与控性的跨尺度物理学机制[J].南京航空航天大学学报,2017,49(5):645-652 |
| 金属构件选区激光熔化增材制造控形与控性的跨尺度物理学机制 |
| Cross-Scale Physical Mechanisms for Structure and Performance Control of Metal Components Processed by Selective Laser Melting Additive Manufacturing |
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| DOI：10.16356/j.1005-2615.2017.05.007 |
| 中文关键词: 增材制造 3D打印 选区激光熔化 形性调控 |
| 英文关键词:additive manufacturing 3D printing selective laser melting structure and performance control |
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| 中文摘要: |
| 激光增材制造逐点、逐线、逐域的局部成形特性，要求对金属构件激光增材制造过程进行微观—介观—宏观跨尺度的控形与控性，以实现对球化、孔隙、变形及裂纹等典型冶金缺陷的有效调控。本文针对难加工铝合金构件选区激光熔化精密增材制造，在介观尺度揭示了金属粉末激光熔化/凝固的热力学行为及球化效应形成与抑制机理，在微观尺度明晰了金属激光熔池内部熔体表面张力对气泡运动及熔体致密化的作用机制，在宏观尺度提出了金属构件选区激光熔化的热作用机制及构件内应力形成和变形行为。本文为高性能复杂金属构件激光增材制造的控形与控性提供了物理学基础及关键工艺调控方法。 |
| 英文摘要: |
| Due to the point by point, line by line and area by area localized forming characteristics of laser additive manufacturing (LAM) process, it is required to carry out the microscopic—mesoscopic—macroscopic cross scale structure and performance control of LAM of metal components, in order to realize the effective control of balling effect, porosity, deformation, cracks and other typical metallurgical defects. In this paper, the selective laser melting (SLM) precision manufacturing of hard to process aluminum alloy is performed. In the mesoscopic scale, the thermodynamic behavior of the laser melting/solidification of the metal powder is disclosed and the formation and inhibition mechanisms of balling effect are revealed. In the microscopic scale, the mechanism of the surface tension of the melt in the molten pool on the bubble motion and melt densification is clarified. In the macroscopic scale, the thermal mechanism and the stress formation and deformation behavior of LAM processed components are proposed. This study can provide the physical basis and key process control method for the structure and performance control of high performance and complex metal components by LAM. |
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