Huang Biao, Tang Hongqun, Huang Jincheng, Jia Yuanxiang, Liao Liuhui, Pang Shuhuan, Zheng Xu, Chen Zhendong
State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, Guangxi University, Nanning 530004, China.
Key Laboratory of High Performance Structural Materials and Thermo-Surface Processing (Guangxi University), Education Department of Guangxi Zhuang Autonomous Region, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China.
Micromachines (Basel). 2024 Aug 31;15(9):1121. doi: 10.3390/mi15091121.
High-strength aluminium alloys are prone to porosity and cracking during laser-based powder bed fusion of metals (PBF-LB/M) due to the complex solidification behaviour, thus limiting the preparation of high-quality aluminium alloys. In order to effectively reduce the defect formation, this study investigated the influence mechanism of different process parameters on the formation of porosity and cracks in Al-Zn-Mg-Cu alloys in the PBF-LB/M process by combining experimental and numerical simulation. The degree of influence of the process parameters on the temperature field and the temperature field on the defect formation was also quantified using path analysis. The results show that modulation of the process parameters can effectively reduce the formation of cracks and pores, although it is difficult to eliminate them. The melt pool temperature has a significant effect on the formation of porosity, and the temperature gradient has a significant effect on the formation of cracks. The degree of influence of laser power on the melt pool temperature and temperature gradient was greater than that of scanning speed, with values of 0.980 and 0.989, respectively. Therefore, the priority of modulating the laser power is higher than that of scanning speed in order to reduce the formation of defects more effectively.
由于凝固行为复杂，高强度铝合金在基于激光的金属粉末床熔融（PBF-LB/M）过程中容易出现气孔和裂纹，从而限制了高质量铝合金的制备。为了有效减少缺陷的形成，本研究通过实验和数值模拟相结合的方法，研究了不同工艺参数对PBF-LB/M工艺中Al-Zn-Mg-Cu合金气孔和裂纹形成的影响机制。还使用路径分析量化了工艺参数对温度场的影响程度以及温度场对缺陷形成的影响。结果表明，尽管难以消除裂纹和气孔，但通过调整工艺参数可以有效减少它们的形成。熔池温度对气孔的形成有显著影响，温度梯度对裂纹的形成有显著影响。激光功率对熔池温度和温度梯度的影响程度大于扫描速度，分别为0.980和0.989。因此，为了更有效地减少缺陷的形成，调整激光功率的优先级高于扫描速度。
