摘要
选区激光熔化技术打印速度相对较低,在大规模生产中的应用受到一定限制。为了突破这一瓶颈,当前研究正聚焦于多激光打印技术,该技术被广泛认为是显著提升打印效率的关键途径。本工作探讨了使用单激光和双激光制造AlSi10Mg材料的超高周疲劳(Very high cycle fatigue, VHCF)行为。结果表明,单激光制造的材料总体上表现出更高的VHCF寿命,但两种方法制造的材料在疲劳寿命上的分散度较大。对微观结构和疲劳断口的分析发现,单激光制备的样品内部孔洞呈现随机分布,而双激光制备的样品孔洞在激光搭接区域显著集中。此外,裂纹源缺陷的尺寸及其萌生位置是造成样品VHCF性能差异的主要因素。为深入研究孔洞尺寸对材料VHCF行为的影响,采用P-S-N模型对数据进行了详细分析。
The application of SLM technology in mass production is constrained by its relatively slow printing speed. Current research efforts are primarily focused on enhancing the printing speed of SLM, with multi-laser printing technology emerging as a promising solution to significantly acce- lerate the process. This study examined the VHCF behavior of AlSi10Mg material produced using single-laser and dual-laser techniques. The findings indicated that the material produced by the single-laser method demonstrated a higher VHCF life, despite considerable scatter in fatigue life for both methods. Through the analysis of microstructure and fatigue fracture surfaces, it was found that the defects are randomly distributed, while the defects in the dual-laser prepared specimens are significantly concentrated in the laser overlap regions. Microstructure and fatigue fracture surface analyses revealed a substantial presence of pores in the overlapping regions of AlSi10Mg material produced by the dual-laser met- hod . Furthermore, the size of the critical defects and their initiation sites are the main factors influencing the difference in VHCF performance of the specimens. To further investigate the impact of defect size on the VHCF behavior of the material, this study conducted a detailed analysis of the data using the P-S-N model.
作者
敬宇
李文凯
仵翱奇
石燕栋
石磊
苏旭明
JING Yu;LI Wenkai;WU Aoqi;SHI Yandong;SHI Lei;SU Xuming(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310023,China;Zhejiang Provincial Engineering Center of Integrated Manufacturing Technology and Intelligent Equipment,College of Engineering,Hangzhou City University,Hangzhou 310015,China;Taihang Laboratory,Chengdu 610000,China)
出处
《材料导报》
北大核心
2025年第22期189-194,共6页
Materials Reports
