718HH塑料模具钢的粉末特性及其激光选区熔化成形性能  

Formability and mechanical properties of 718HH plastic mould steel produced by selective laser melting

作　　者：张梦醒 马党参[1] 周健[1] 迟宏宵[1] 王长军[1] 殷军伟 ZHANG Mengxing;MA Dangshen;ZHOU Jian;CHI Hongxiao;WANG Changjun;YIN Junwei(Institute of Special Steel,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]钢铁研究总院有限公司特殊钢研究院,北京100081

出　　处：《粉末冶金工业》2023年第6期27-32,共6页Powder Metallurgy Industry

基　　金：宁波市科技计划资助项目(2018B10003)。

摘　　要：为了研制选区激光熔化技术成形低成本高性能模具钢零部件,采用真空气雾化技术制备了激光选区熔化成形用718HH塑料模具钢粉末,利用激光粒度分析仪、扫描电镜、霍尔流速计及智能粉体性能测试仪检测了粉末的粒度、形貌和流动性,并研究了该模具钢粉末的SLM成形件的力学性能。结果表明:实验粉末的D_(10)、D_(50)、D_(90)粒度分别为:27.83、43.52、69.09μm;大部分粉末呈球形或近球形,粉末的流动性为18.44 s/50 g,松装密度为4.16 g/cm~3,振实密度为4.75 g/cm~3,压缩度为12.4%。实验粉末的流动性很好,适用于激光选区熔化成形。成形件的抗拉强度为1 392 MPa,屈服强度为1 257 MPa,冲击韧性为15.3 J,硬度和韧性均高于国产718HH塑料模具钢试样。In order to develop low-cost and high-performance special die steel metal of selective laser melting,the 718HH plastic mould steel powder for selective laser melting was prepared by vacuum-air atomization technology. The particle size morphology and fluidity of the powder were detected by laser particle size analyzer,scanning electron microscope, Hall flowmeter and intelligent powder performance tester. Selective Laser Melting(SLM) forming properties of the powders and properties of the formed parts were studied. Tensile tests were conducted to study the mechanical properties of the SLM molded parts of the die steel powder. The results indicate that the particle sizes of D_(10), D_(50) and D_(90) of the test powders are 27.83 μm, 43.52 μm and 69.09 μm, respectively, and most of the powders are spherical or nearly spherical, with a fluidity of 18.44 s/50g, an apparent density of 4.16 g/cm~3, a tap density of 4.75 g/cm~3, and a compressibility of 12.4%. The 718HH plastic mould steel powder is suitable for melting and forming laser selections. The tensile strength of the formed parts is 1 392 MPa,the yield strength is 1 257 MPa, and the impact toughness is 15.3 J, and the strength and the toughness are higher than those of domestic 718HH plastic mould steel samples.

关 键 词：718HH塑料模具钢 激光选区熔化 成形性 强度 韧性 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG142.1[一般工业技术—材料科学与工程]