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

doi:10.13251/j.issn.0254-6051.2022.09.010

Abstract

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

CLC Number:

TG143.1

Liu Zaixi, Lu Dehong, Wang Changjun, Liu Zhenbao, Liang Jianxiong. Effect of gas atomization parameters on characteristics of 1720 MPa maraging steel powder used for selective laser melting process[J]. Heat Treatment of Metals, 2022, 47(9): 54-59.

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