Impact of laser scanning strategies on microstructure in laser powder bed fusion (LPBF) of nanoparticle-infused pre-alloyed water-atomized iron powder

Im, Taehyeob; Kim, Jin-Young; Gurung, Kopila; Meyers, Sebastian; Van Hooreweder, Brecht; Lee, Jai-Sung; Kim, Jin-Kyung; Lee, Caroline Sunyong

doi:10.1016/j.msea.2023.145989

Cited by 3 publications

(1 citation statement)

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“…The cracks in the B sample are continuous, and cracks induce the formation of keyholes in the BS sample. The pores defect, common in LPBFed alloys [28][29][30], occurs in all these samples. Most of the spherical pores are caused by particle dehydrogenation, while others are related to melting conditions with the metastable state of powders during the printing process.…”

Section: Cracks and Relative Densitymentioning

confidence: 94%

Microstructure and Mechanical Properties of a Novel Al-Mg-Sc-Ti Alloy Fabricated by Laser Powder Bed Fusion

Shu,

Liu

2024

Materials

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(TiH2 + ScH3)/Al-Mg composite powders with different Ti contents were produced by ball milling. These composite powders were fabricated to cube and cuboid shape samples via a laser powder bed fusion process with optimal processing parameters. The TiH2 and ScH3 particles underwent dehydrogenation during the laser powder bed fusion process, and these composite powders ultimately formed Al-Mg-Sc-Ti alloys. The relative density, printability, microstructure, hardness and tensile properties of these alloy samples were investigated. The results show that these Al-Mg-Sc-Ti alloys have lower hot-crack sensitivity, having fine equiaxed grains. An Al18Mg3(Ti,Sc)2 intermetallic phase and in situ L12-Al3(Sc,Ti) precipitations formed during the laser powder bed fusion process, which is beneficial for nucleation and dispersion strengthening. The ultimate tensile strength of the Al-Mg-0.7Sc-1.0Ti alloy was 313.6 MPa with an elongation of 6.6%. During the hot isostatic pressing treatment, most of the Mg element precipitated from the matrix and changed the Al3(Sc,Ti) into a Al18Mg3(Ti,Sc)2 precipitate completely. The Al-Mg-Sc-Ti alloys were nearly fully dense after the hot isostatic pressing treatment and exhibited better mechanical properties. The ultimate tensile strength of the Al-Mg-0.7Sc-1.0Ti was 475 MPa with an elongation of 8.5%.

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Section: Cracks and Relative Densitymentioning

confidence: 94%