Study on selective laser melting of Al-Mg-Mn alloy under PLC control and its microstructure and properties
SONG Liming1，ZHANG Dajun1，XU Buxin2，LUO Zhixiang2
（1. College of Electronic Engineering, Zhengzhou Professional Technical Institute of Electronics and Information,
Zhengzhou 451450, China; 2. School of materials science and engineering, Zhengzhou
University, Zhengzhou 450001, China）
Abstract：The selective laser melting forming system based on PLC control was used for rapid forming of Al-Mg-
Mn alloy. The effects of laser scanning speed on the density, microstructure, phase and hardness of the formed parts
were studied, and the effects of aging temperature and time on the compression properties of the formed parts were
investigated. The results show that with the laser scanning speed increasing from 700 mm/s to 1 300 mm/s, the porosity
of the formed sample increases and the relative density decreases gradually under the condition of other process
parameters unchanged. With the increase of laser scanning speed, the weld pool parallel to the deposition direction
gradually increases, and the fusion line becomes thinner. Multilayer deposition channels with cross distribution
can be seen perpendicular to the deposition direction, but when the laser scanning speed is 1300mm/s, the weld
channel contour is relatively vague; At the same laser scanning speed, the hardness of the plane parallel to the deposition
direction is higher than that of the plane perpendicular to the deposition direction. With the increase of laser
scanning speed, the microhardness of XZ plane and XY plane first increases and then decreases, and the maximum hardness is obtained when the laser scanning speed is 900mm/s; With the increase of aging temperature or the extension
of aging time, the microhardness, yield strength and compressive strength of the selective laser melting
forming sample first increase and then decrease, and the maximum value is obtained when the aging temperature is
300 ℃ and the aging time is 6 h, which is mainly related to the precipitation strengthening effect of Al3(Sc,Zr)
phase in the alloy at this time.
宋黎明， 张大俊，许婄鑫，罗志翔. PLC控制下激光选区熔化 Al-Mg-Mn合金及组织性能研究[J]. 粉末冶金工业, 2024, 34(03): 106-113.
SONG Liming，ZHANG Dajun，XU Buxin，LUO Zhixiang. Study on selective laser melting of Al-Mg-Mn alloy under PLC control and its microstructure and properties. Powder Metallurgy Industry, 2024, 34(03): 106-113.
2024, Vol. 34 
