Zhu Xiaolei, Ma Yuzhong, Wu Hao, Li Mingxuan, Lu Xiaofeng
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, 211816, China.
Heliyon. 2024 Jul 5;10(14):e34137. doi: 10.1016/j.heliyon.2024.e34137. eCollection 2024 Jul 30.
The melt pools, the most basic units of the components fabricated by the selective laser melting (SLM) technology, play an important role in the mechanical properties of the structures. A self-developed in-situ tensile observation platform was used to carry out the in-situ tensile test of SLMed AlSi10Mg alloy specimens under the observation of optical microscope. With a series of obtained experimental data on mechanical properties and metallurgical images, combined with the digital image correlation(DIC) technology, the melt pool of the specimen and the strain of defects were analyzed, and the deformation and fracture mechanism of the SLMed AlSi10Mg alloy specimens was obtained. The results show that the proposed method successfully obtains the deformation field evolution data of the melt pool and defects, which provides experimental and theoretical support for the further study of crack extension characteristics and fatigue life prediction of SLMed metallic material components.
熔池是通过选择性激光熔化（SLM）技术制造的部件的最基本单元，在结构的力学性能中起着重要作用。采用自主研发的原位拉伸观测平台，在光学显微镜观察下对SLM制备的AlSi10Mg合金试样进行原位拉伸试验。利用获得的一系列力学性能实验数据和金相图像，结合数字图像相关（DIC）技术，分析了试样的熔池和缺陷应变，得到了SLM制备的AlSi10Mg合金试样的变形和断裂机制。结果表明，该方法成功获得了熔池和缺陷的变形场演化数据，为进一步研究SLM金属材料构件的裂纹扩展特性和疲劳寿命预测提供了实验和理论支持。
