Effect of Preheating Temperature on Mechanical Properties of 30%SiCp/AlSi10Mg Composites Fabricated by Selective Laser Melting
GUO Yaoqi1,2, TANG Min1,2,3, MA Honglin1, WEI Wenhou1, WANG Linzhi1, FAN Shuqian1, ZHANG Qi1,*
1 Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China 2 Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China 3 School of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China
Abstract: Selective laser melting of medium volume fraction SiCp/Al composites under ambient temperature substrate conditions suffers from metallurgical defects such as holes and cracks, which in turn lead to low densities and poor mechanical properties of the fabricated parts. The influence of a substrate preheating temperature (200—400 ℃) on the apparent density and mechanical properties of fabricated 30%(mass fraction) SiCp/AlSi10Mg (45 μm) parts with fixed and optimized process parameters was investigated at first. As the mass fraction of SiCp was increased to 50%, the influence of the above mentioned substrate preheating temperature on the properties of fabricated composites was evaluated again. The results show that, when the mass fraction of SiCp is 30%, an increased preheating temperature of a substrate can reduce the holes and cracks of a formed parts, the apparent densities and mechanical properties of the fabricated parts are significantly improved; when the substrate is preheated to 400 ℃, the maximum apparent densities of fabricated parts can reach 97.98%, while the ultimate compressive strength and ultimate tensile strength are 578 MPa and 56 MPa, respectively. The effect of substrate preheating on the densification and strengthening of mechanical properties of fabricated parts gradually decreases as the mass fraction of SiCp was increased to 50%. This study proves that a high temperature preheating of the substrate is effective in suppressing metallurgical defects of medium volume fraction SiCp/Al composites fabricated with selective laser mel-ting, providing an engineering solution for additive manufacturing of SiCp/Al composites.
通讯作者:
*张祺,中国科学院重庆绿色智能技术研究院副研究员、硕士研究生导师。2006年6月中国科学技术大学机械设计制造及其自动化专业本科毕业,2011年6月法国萨瓦大学力学与材料专业博士毕业,2013年6月中国科学技术大学测试计量技术及仪器专业博士毕业。从事复合材料增材制造技术以及增材制造质量监控方面的研究工作,发表SCI论文30余篇,包括Materials & Design、Scripta Materialia、Journal of Alloys and Compounds、Journal of Manufacturing Processes等,获授权中国发明专利20余项。zhangqi@cigit.ac.cn
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2024, Vol. 38 
