激光选区熔化AlSi10Mg合金典型孔隙缺陷的重熔研究  

Remelting Study on the Typical Pore Defects of AlSi10Mg Alloy Fabricated by Selective Laser Melting

作　　者：刘伟军 杜雪 王慧儒 卞宏友 张凯[1] Liu Weijun;Du Xue;Wang Huiru;Bian Hongyou;Zhang Kai(School of Mechanical Engineering,Shenyang University of Technology,Liaoning Key Laboratory of Laser Surface Engineering Technology,Liaoning 110870,Shenyang,China)

机构地区：[1]沈阳工业大学机械工程学院,辽宁省激光表面工程技术重点实验室,辽宁沈阳110870

出　　处：《应用激光》2024年第9期1-9,共9页Applied Laser

基　　金：国家科技重大专项(J2019-VII-0004-0144);辽宁“百千万人才工程”资助项目(LNBQW 2020B0050)。

摘　　要：激光选区熔化AlSi10Mg合金成形过程将导致孔隙缺陷及表面球化现象,激光重熔处理是提高其成形质量的有效方法之一。针对激光选区熔化AlSi10Mg合金的三种典型孔隙缺陷(未熔合孔、气孔和匙孔),探究重熔功率对成形试样致密度、表面粗糙度及熔池深度的影响规律,获得最优重熔功率。基于熔池特征分析,揭示重熔处理作用下内部缺陷及表面形貌的成形机理。结果表明,激光重熔处理使AlSi10Mg合金未熔粉末重新吸收能量熔化,可消除未熔合孔缺陷,减少气孔和匙孔缺陷,且不同孔隙缺陷的最优重熔功率不同。此外,激光重熔处理可改善试样表面形貌,避免表面球化现象,并降低表面粗糙度。The selective laser melting(SLM)process of AlSi10Mg alloy is prone to pore defects and surface spheroidization,which can be mitigated through laser remelting treatment.This study focuses on three common pore defects—lack of fusion,gas holes,and keyholes—in AlSi10Mg alloy produced by SLM.The impact of remelting power on the density,surface roughness,and melt pool depth of the samples was examined to determine the optimal remelting power.The results show that the un-melted AlSi10Mg alloy power is remelted using laser remelting treatment,the lake of fusion defect can be eliminated,the keyhole and gas hole defects can be decreased,and the optimal remelting power is different for different pore defects.In addition,the laser remelting treatment can improve the surface morphology of the samples,eliminate the surface spheroidization phenomena and reduce the surface roughness.

关 键 词：激光选区熔化 重熔 AlSi10Mg合金 致密度 表面粗糙度 

分 类 号：TG146[一般工业技术—材料科学与工程]