金属热处理 ›› 2022, Vol. 47 ›› Issue (9): 54-59.DOI: 10.13251/j.issn.0254-6051.2022.09.010

• 工艺研究 • 上一篇    下一篇

气雾化参数对SLM用1720 MPa级马氏体时效钢粉末特性的影响

刘再西1,2, 卢德宏1, 王长军2, 刘振宝2, 梁剑雄2   

  1. 1.昆明理工大学 材料科学与工程学院, 云南 昆明 650032;
    2.钢铁研究总院 特殊钢研究院, 北京 100089
  • 收稿日期:2022-04-12 修回日期:2022-07-13 发布日期:2022-10-18
  • 通讯作者: 卢德宏,教授,博士,E-mail: ldhongkust@126.com
  • 作者简介:刘再西(1995—),男,硕士研究生,主要研究方向为马氏体钢热处理,E-mail:962314414@qq.com。

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

Liu Zaixi1,2, Lu Dehong1, Wang Changjun2, Liu Zhenbao2, Liang Jianxiong2   

  1. 1. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650032, China;
    2. Special Steel Research Institute, Central Iron and Steel Research Institute, Beijing 100089, China
  • Received:2022-04-12 Revised:2022-07-13 Published:2022-10-18

摘要: 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。

关键词: 马氏体时效钢, 气雾化, 过热度, 金属粉末

Abstract: 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.

Key words: maraging steel, gas atomization, superheat, metal powder

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