SLM成形10%SiC颗粒增强铝基复合材料的工艺优化及性能

Properties and Process Optimization of 10%SiCp/AlSi10 Mg Composites by SLM

在探究选区激光熔化(SLM)成形技术对10%SiC颗粒增强AlSi 10 Mg复合材料的影响规律时,采用不同的成形工艺参数(扫描速度和扫描间距)组合范围对成形件的显微组织、相对致密度和物理性能进行研究。结果表明,在相同的扫描功率下,当扫描间距从0.05 mm上升到0.14 mm时,SLM成形的复合材料试样致密度先上升后下降;当扫描速度从700 mm/s上升到1700 mm/s时,复合材料试样的致密度也先上升后下降;当选择工艺参数为激光功率300 W、铺粉层厚0.03 mm、扫描速度1100 mm/s、扫描间距0.11 mm时,10%SiC颗粒增强AlSi 10 Mg复合材料的相对致密度可以达到98.34%,布氏硬度为189HBW。同时试样内部孔洞和裂纹较少,SiC颗粒在铝基体中均匀分布,与铝基体有着良好的界面反应。

In order to investigate the effect of selective laser melting(SLM)forming technology on 10%SiC particle reinforced AlSi10Mg composite material,the microstructure,relative density and physical properties of forming parts were studied by using different combination range of for-ming process parameters(scanning speed and scanning spacing).The results show that,under the same scanning power,when the scanning spacing increases from 0.05 mm to 0.14 mm,the density of composite samples formed by SLM first increases and then decreases.When the scanning speed increases from 700 mm/s to 1700 mm/s,the density of composite samples also increases first and then decreases.When the laser power is 300 W,the thickness of powder layer is 0.03 mm,the scanning speed is 1100 mm/s,and the scanning spacing is 0.11 mm,the relative density of 10%SiC particles reinforced AlSi10Mg composite material could reach 98.34%,and the brinell hardness was 189HBW.At the same time,there are few holes and cracks in the sample,SiC particles are uniformly distributed in the aluminum matrix,and there have a good interface reaction between SiC particles and aluminum matrix.