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热传递和融化池热流体动力学在激光基粉末床金属融合中的多物理建模
Tingzhong Zhang1, Xijian Lin2, Yanwen Qin3
1School of Mechanical and Electrical Engineering, Zhoukou Normal University, Zhoukou 466001, China.
Materials (Basel, Switzerland)
|July 12, 2025
概括
优化基于激光的粉末床融合 (PBF-LB/M) 的金属对于制造复杂的零件至关重要. 这项研究模拟了传热和池动态,揭示了工艺参数如何影响零件密度和表面粗度.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 制造业 制造技术 制造技术
背景情况:
- 基于激光的金属粉末床融合 (PBF-LB/M) 是复杂金属零件的关键增材制造技术.
- 工业应用受到技术挑战和严格要求的阻碍,需要流程优化.
研究的目的:
- 开发和利用一个过渡模型来研究PBF-LB/M的热传递和融化池行为.
- 为了确定工艺参数与制造金属零件的质量 (表面粗,密度) 之间的关系.
主要方法:
- 建立了一个采用水平设置方法的三相过渡模型.
- 该模型结合了表面张力,马兰戈尼效应,反弹压力和蒸发引起的质量/热损失.
- 进行了模拟,以分析不同过程参数下的池动态.
主要成果:
- 零件质量,包括表面粗度和密度,与激光功率,层厚度和扫描速度等工艺参数密切相关.
- 低体积能量密度导致不充分的融合和孔隙缺陷.
- 高线路能量密度导致光滑的化轨道,低孔隙性和高产品密度.
- 在轨道开始/结束点的部分融化有助于孔隙形成.
结论:
- 这些发现为控制热传递和融化池行为提供了关键的见解,以改善金属添加剂制造质量.
- 了解这些关系对于提高PBF-LB/M制造部件的可靠性和性能至关重要.
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