SLM成形参数对18Ni-300模具钢致密度的影响  

Effect of SLM Forming Parameters on Relative-Density of 18Ni-300 Die Steel

作　　者：吴仔洋 孙振忠[1] 王皓亮 宋成浩 劳长石 林路平 Wu Ziyang;Sun Zhenzhong;Wang Haoliang;Song Chenghao;Lao Changshi;Lin Luping(College of Mechanical Engineering,Dongguan University of Technology,Dongguan 523808,Guangdong,China;College of Mechatronics and Control Engineering,Shenzhen University,Shenzhen 518061,Guangdong,China)

机构地区：[1]东莞理工学院机械工程学院,广东东莞523808 [2]深圳大学机电与控制工程学院,广东深圳518061

出　　处：《激光与光电子学进展》2022年第17期282-288,共7页Laser & Optoelectronics Progress

基　　金：广东省科技计划(2017B090911015)。

摘　　要：为研究选区激光熔融(SLM)技术成形试样的工艺参数对试样致密度及微观孔洞的影响规律,设计了正交试验方案对SLM成形的18Ni-300马氏体时效钢进行分析和讨论。从SLM成形工艺参数的三个维度(激光功率、扫描速度和扫描间距)出发,基于灰度理论研究了成形件的致密度,得到致密度与体能量密度的对应关系,并对材料的微观孔洞进行分析。结果表明:当体能量密度在30~50 J/mm^(3)时,材料致密度偏低,且在该范围内提高体能量密度能极大提升材料的致密度,将体能量密度保持在50~150 J/mm^(3)能得到较高致密度的试样;随着致密度的提升,试样内部的孔洞逐渐变小,形状也变得规则,当致密度达到99%后,会得到形状规则的微小孔洞;改变工艺参数范围可以得到合适致密度的试样。This study investigates the effect of process parameters on the relative density and microscopic pores of samples formed using selective laser melting(SLM)technology.To analyze and discuss the 18Ni300 maraging steel,an orthogonal experimental scheme is designed.With the threedimensional SLM forming process parameters(laser power,scanning speed,and hatch spacing),the relative density of printed parts is studied and analyzed based on the gray theory,the corresponding relationship between the relative density and volume energy density is obtained,and the microstructure and holes of the material are analyzed.The results show that when the volume energy density is 30‒50 J/mm^(3),the relative density is low.In addition,increasing the volume energy density within this range can significantly improve the relative density of the material and keeping the volume energy density at 50‒150 J/mm^(3) can achieve high relative density.With increasing relative density,the holes in the sample gradually becomes smaller and its shape becomes regular.When the relative density reaches 99%,the tiny holes with a regular shape are obtained.The samples with high or low density can be obtained by changing the range of process parameters.

关 键 词：材料 18Ni-300马氏体时效钢 致密度 能量密度 微观孔洞 

分 类 号：TG142.[一般工业技术—材料科学与工程]