能量密度对SLM成形316L致密度与耐磨性能的影响研究  

Effect of Energy Density on Density and Wear Resistance of SLM Formed 316L

作　　者：许明三 张正[1,2] 黄旭 Xu Mingsan;Zhang Zheng;Huang Xu(Mechanical and Automobile College,Fujian University of Technology,Fuzhou,Fujian 350118,China;Advanced Manufacturing Productivity Promotion Center of Fujian University of Technology,Fuzhou,Fujian 350118,China)

机构地区：[1]福建工程学院机械与汽车工程学院,福建福州350118 [2]福建工程学院先进制造生产力促进中心,福建福州350118

出　　处：《应用激光》2021年第3期431-438,共8页Applied Laser

基　　金：国家自然科学基金(51575110);福建省自然科学基金(2020J01872);福建工程学院科研启动基金(GY-Z160046)。

摘　　要：对选区激光熔化技术(SLM)成形316L不锈钢样件的成形性能进行试验研究,利用能量密度公式建立不同参数与成形性能之间的关系,针对不同的能量密度对样件致密度、耐磨性能的影响进行探究。结果表明,当激光能量密度从34.72 J/mm3增加到69.44 J/mm3时,试样件致密度从91%增加到99%。能量密度的增加,导致熔池内部的流动性提高,从而使金属溶液表面张力减少,致密度随之增加。之后能量密度从86.81 J/mm3增加到121.53 J/mm3,致密度没有明显变化;而试样件的耐磨性随着能量密度的增加呈现先增加后减少的规律,当能量密度为86.81 J/mm3时,样件拥有最好的耐磨性和最高的致密度。An experimental study was conducted on the forming performance of 316 L stainless steel samples formed by selective laser melting technology(SLM). The relationship between different parameters and the forming performance was established by using the energy density formula, and the influence of different energy densities on the density and wear resistance of the samples was investigated. The results show that when the laser energy density increases from 34.72 J/mm3 to 69.44 J/mm3, the density of the specimen increases from 91% to 99%. This is because the increase in energy density leads to an increase in the fluidity inside the molten pool. As a result, the surface tension of the metal solution decreases, and the density increases accordingly. After that, the energy density increased from 86.81 J/mm3 to 121.53 J/mm3, and the density did not change significantly;while the wear resistance of the specimen increased first and then decreased with the increase of energy density, when the energy density was 86.81 J/mm3, the sample has the best wear resistance and the highest density.

关 键 词：选区激光熔化 能量密度 致密度 显微组织 耐磨性能 

分 类 号：TG142[一般工业技术—材料科学与工程]