Achieving Superior Strength and Ductility of AlSi10Mg Alloy Fabricated by Selective Laser Melting with Large Laser Power and High Scanning Speed

doi:10.1007/s40195-022-01410-w

Abstract

Abstract:

AlSi10Mg alloy was prepared by selected laser melting (SLM) in a high laser power range 300-400 W. The effects of energy density on the relative density, microstructure and mechanical properties of the SLMed AlSi10Mg alloy were studied. The results showed that the SLMed AlSi10Mg alloy fabricated at a laser power of 400 W and a scanning speed of 1800 mm/s had a relative density of 99.4%, a hardness of 147.8 HV, a tensile strength of 471.3 MPa, a yield strength of 307.1 MPa, and an elongation of 9.6%, exhibiting excellent comprehensive mechanical properties. The unique combination of the melt pool structure and microstructure caused by the large laser power and fast scanning was responsible for the excellent performance. The wide and shallow melt pool structure with few defects and proper overlapping between the continuous melt pools were obtained. The growth of columnar crystals was inhibited by a large proportion of equiaxed grains formed at the border of melt pools, and numerous sub-structures were observed within the α-Al grains. This study provided a more efficient process parameters for the preparation of the SLMed AlSi10Mg alloy. The enhanced mechanical property will help to broaden the application of the AlSi10Mg alloy in industry.

Key words: Selective laser melting, AlSi10Mg alloy, Melt pool, Mechanical property

Jiahe Mei, Ying Han, Guoqing Zu, Weiwei Zhu, Yu Zhao, Hua Chen, Xu Ran. Achieving Superior Strength and Ductility of AlSi10Mg Alloy Fabricated by Selective Laser Melting with Large Laser Power and High Scanning Speed[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(10): 1665-1672.

Figures/Tables 6

Fig. 1 Schematic diagram of the SLM process: a scanning strategy, b process parameters, c morphology of the AlSi10Mg alloy powders, d XRD patterns of the powders and SLMed samples. The inset in image c shows the size distribution of powder particles

Fig. 2 a Contour plot of relative density versus SLM process parameters, b variation of hardness with energy density for each sample in XY and X(Y)Z planes

Fig. 3 Mechanical properties of the SLMed samples with different energy densities along a, b horizontal, c, d vertical directions. Tensile fracture morphologies of the sample #33 along e, f horizontal, g, h vertical directions. (UTS, YS and EL correspond to ultimate tensile strength, yield strength and elongation, respectively)

Fig. 4 Microstructural evolution of the samples with different energy density a-d and model of the continuous melt pool structure with fine HAZ e. Images a'-d' and a''-d'' correspond to the microstructures in XY- and X(Y)Z-planes

Fig. 5 IPF orientation maps of the sample #33 at a XY-plane and b X(Y)Z-plane; c misorientation angle distribution on the X(Y)Z-plane, d substructure distribution map corresponding to the X(Y)Z-plane

Fig. 6 Recent results of tensile strength and elongation of the SLMed AlSi10Mg alloy

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