用粉床融合-激光束方法制造的AlSi10Mg合金中的残余应力映射
Mohamed E Daoud1, Inas Taha1, Ahmed Abdelgawad2
1Department of Physics, Khalifa University, P. O. Box 127788, Abu Dhabi, United Arab Emirates.
Scientific reports
|July 9, 2025
概括
热处理显著降低了粉床融合-激光束 (PBF-LB) AlSi10Mg合金中的纳米级残余应力,减轻了异性质,并影响了沉的行为. 这项研究提供了对增材制造压力减轻策略的见解.
科学领域:
- 材料科学与工程 材料科学与工程
- 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:
- 粉床聚变激光束 (PBF-LB) 制造的金属合金,如AlSi10Mg,表现出由加工参数影响的异构余应力.
- 了解纳米级残余应力分布对于预测PBF-LB组件的机械性能和长期稳定性至关重要.
- 剩余应力和微观结构演变之间的相互作用,特别是沉的行为,需要详细的研究.
研究的目的:
- 在PBF-LB AlSi10Mg合金的单颗粒内绘制和量化纳米级残余应力.
- 为了研究T6热处理对残余应力异构性和大小的影响.
- 通过有限元法 (FEM) 模拟,阐明控制欧分解和沉扩散的压力驱动机制.
主要方法:
- 利用各种传输电子显微镜 (TEM) 模式,绘制纳米尺度残余应力在已构建和T6热处理的PBF-LB AlSi10Mg样本中.
- 沿扫描和建筑方向获得的剩余应力图.
- 采用基于图像的有限元素方法 (FEM) 模拟来建模压力驱动的微观结构进化.
主要成果:
- 与现成样本相比,T6热处理在建筑方向 ([1̅00]晶体方向) 上大幅降低了高达70%的拉力余应力.
- 观察到残余应力异质性,在扫描方向的平均应力比建筑方向的平均应力更高,无论是作为建造 (13%) 和T6处理 (23%) 的样本.
- 在FEM模拟中,确定了欧区内的拉力和压力应力区域,作为扩散和沉核形成的起源.
结论:
- T6热处理有效地减轻了PBF-LB AlSi10Mg合金中的纳米级残余应力和异性质.
- 剩余应力在热处理过程中在矩阵内的微结构演变中发挥着关键作用.
- 这些发现为在增材制造的合金中对残余应力管理和微结构控制提供了更深入的理解.
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