气雾化参数对SLM用1720 MPa级马氏体时效钢粉末特性的影响

利用真空感应熔炼气雾化法制备1720 MPa级马氏体时效钢粉末,研究雾化压力、过热度、气体加热温度对粉末特性的影响。结果表明,当雾化压力较高、过热度较高、气体加热温度较高的情况下,金属粉末的细粉收得率较大,松装密度较高,流动性较好。最佳雾化参数为漏嘴孔径ϕ5 mm、雾化压力5.0 MPa、过热度245 K、雾化气体温度100 ℃。该工艺条件下的时效钢粉末球形度良好,粉末流动性为20.15 s/50 g,松装密度为4.23 g/cm。

Effect of gas atomization parameters on characteristics of 1720 MPa maraging steel powder used for selective laser melting process

1720 MPa maraging steel powders were manufactured by vacuum induction melting gas atomization (VIGA) process, and the effect of atomization pressure, superheat degree and gas heating temperature on powder characteristics was studied. The results show that when the atomization pressure, superheat degree and gas heating temperature are relatively higher, the yield of fine metal powder and the bulk density are higher, and the powder flowability is better. The optimal atomization parameters are the nozzle diameter of ϕ5 mm, the atomization pressure of 5.0 MPa, the superheat degree of 245 K, and the gas atomization temperature of 100 ℃. The aging steel powder under this process has good sphericity with powder flowability of 20.15 s/50 g and bulk density of 4.23 g/cm³.