Xi Lixia, Lu Qiuyang, Gu Dongdong, Cao Shaoting, Zhang Han, Kaban Ivan, Sarac Baran, Prashanth Konda Gokuldoss, Eckert Jürgen
Jiangsu Provincial Engineering Laboratory for Laser Additive Manufacturing of High-Performance Metallic Components, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China.
IFW Dresden, Institute for Complex Materials, Dresden, Germany.
3D Print Addit Manuf. 2024 Apr 1;11(2):e731-e742. doi: 10.1089/3dp.2022.0207. Epub 2024 Apr 16.
Laser powder bed fusion (LPBF) of Al-Cu alloys shows high susceptibility to cracking due to a wide solidification temperature range. In this work, 2024 alloys were manufactured by LPBF at different laser processing parameters. The effect of processing parameters on the densification behavior and mechanical properties of the LPBF-processed 2024 alloys was investigated. The results show that the porosity increases significantly with increasing laser power, while the number of cracks and lack-of-fusion defects increase distinctly with increasing scan speed. The solidification cracking susceptibility of the LPBF-processed 2024 alloys prepared at different processing parameters was analyzed based on a finite element model, which was accurately predicted by theoretical calculations. Dense and crack-free 2024 samples with a high densification of over 98.1% were manufactured at a low laser power of 200 W combined with a low laser scan speed of 100 mm/s. The LPBF-processed 2024 alloys show a high hardness of 110 ± 4 HV, an ultimate tensile strength of 300 ± 15 MPa, and an elongation of ∼3%. This work can serve as reference for obtaining crack-free and high-performance Al-Cu alloys by LPBF.
由于凝固温度范围宽，Al-Cu合金的激光粉末床熔融（LPBF）表现出高裂纹敏感性。在这项工作中，通过LPBF在不同激光加工参数下制造了2024合金。研究了加工参数对LPBF加工的2024合金致密化行为和力学性能的影响。结果表明，孔隙率随激光功率的增加而显著增加，而裂纹数量和未熔合缺陷数量随扫描速度的增加而明显增加。基于有限元模型分析了在不同加工参数下制备的LPBF加工2024合金的凝固裂纹敏感性，理论计算准确预测了该敏感性。在200 W的低激光功率和100 mm/s的低激光扫描速度下制造出了致密且无裂纹、致密化率超过98.1%的2024样品。LPBF加工的2024合金表现出110±4 HV的高硬度、300±15 MPa的极限抗拉强度和约3%的伸长率。这项工作可为通过LPBF获得无裂纹和高性能的Al-Cu合金提供参考。
