模具钢粉末的选区激光熔化成型性能及缺陷研究  

Research on Property and Defects of Die Steel Powder Formed by Selective Laser Melting

作　　者：陈帅 陶凤和[1] 贾长治[1] 杨建春[1] CHEN Shuai, TAO Fenghe, JIA Changzhi, YANG Jianchun(Ordnance Engineering College, Shijiazhuang 050003, Chin)

机构地区：[1]军械工程学院火炮工程系,河北石家庄050003

出　　处：《铸造技术》2018年第3期658-661,共4页Foundry Technology

摘　　要：调整激光功率和扫描速度两个主要工艺参数,研究了选区激光熔化成型模具钢粉末的性能。分析工艺参数对试样表面硬度的影响规律,研究成型试样存在的缺陷形式及产生机理。结果表明,选区激光熔化成型H13试样的表面硬度,随线能量的增加整体上表现为先升高后降低的趋势。当激光功率为180 W、扫描速度为400 mm/s、线能量为0.45 J/mm时,试样的上表面硬度和侧表面硬度最高分别为56 HRC和55 HRC。成型过程中球化是导致孔隙的主要原因之一,由球化导致的孔隙形状不规则,且周围存在大量球状颗粒。Two main technological parameters of laser power and scanning speed were adjusted, and the properties of the laser melt forming die steel powder were investigated. The influence of technological parameters on the surface hardness of the sample was analyzed, and the defects form and mechanism of forming samples were studied. The results show that the surface hardness of the preformed H13 samples by SLM show a trend of decrease after the first increase with the increase of liner energy. When the laser power is 180 W, the scanning speed is 400 mm/s and the line energy is 0.45 J/mm, the upper surface hardness of the specimen is 56 HRC and 55 HRC, respectively. Spherification is one of the main causes of porosity in the process of molding. The pore shape caused by spherification is irregular, and there are many spherical particles around it.

关 键 词：选区激光熔化 模具钢 表面硬度 缺陷 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG249