Dynamic Mechanical Properties and Constitutive Model of Selective Laser Melting 316L Stainless Steel at Different Scanning Speeds

Ge, Yongsheng; Lei, Jingfa; Liu, Tao; Bai, Wei

doi:10.21203/rs.3.rs-835137/v1

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…Maconachie [57] and Carassuss [58] characterized the influence of the strain rate on the mechanical properties of specimens obtained by L-PBF with different building orientations and thicknesses. Ge et al [59] studied the behavior of selective laser-melted 316 L stainless steel produced at different scanning speeds, identifying constitutive models of the material as a function of the strain rate and the process parameters employed. Scalzo et al [60] used different experimental setups to quantify the dissipative properties of L-PBF lattice structures.…”

Section: Introductionmentioning

confidence: 99%

Impact of process parameters on the dynamic behavior of Inconel 718 fabricated via laser powder bed fusion

Abruzzo,

Macoretta,

Monelli

et al. 2024

Int J Adv Manuf Technol

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In this research, we investigate the dynamic behavior of Inconel 718 fabricated through laser powder bed fusion (L-PBF), addressing a notable knowledge gap regarding the correlation between process parameters and dynamic properties. The process parameters adopted are deducted from an extension of the Rosenthal solution, formulated to increase the process productivity while avoiding the typical production process defects. The dynamic Young modulus and the structural damping of the material are estimated as a function of the process parameters through ping tests reproducing the flexural vibrations of the specimens in as-built, solutioned, and aged conditions. The microstructure and porosity are investigated through metallographic analyses. The results show a substantial influence of the L-PBF process parameters on the dynamic Young modulus, which markedly increases as the energy density is reduced (23%) and progressively becomes more similar to the conventionally produced material. This influence stands in stark contrast to the relatively modest impact of heat treatments, which underlines a negligible effect of the process-induced residual stress. The structural damping remained approximately constant across all test conditions. The elastic response of the material is found to be primarily influenced by the different microstructures produced as the L-PBF process parameters varied, particularly in terms of the dimensions and shape of the solidification structures. The unexpected relationship between the dynamic Young modulus, energy density, and microstructure unveils the potential to fine-tune the material’s dynamic behavior by manipulating the process parameters, thereby carrying substantial implications for all the applications of additively manufactured components susceptible to significant vibratory phenomena.

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Section: Introductionmentioning

confidence: 99%

Impact of process parameters on the dynamic behavior of Inconel 718 fabricated via laser powder bed fusion

Abruzzo,

Macoretta,

Monelli

et al. 2024

Int J Adv Manuf Technol

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Mechanical Properties and Constitutive Model of Selective Laser Melting 316L Stainless Steel at Different Scanning Speeds

Lei

et al. 2022

Advances in Materials Science and Engineering

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To investigate the effects of different scanning speeds on the mechanical properties of selective laser melting 316L stainless steel (SLM 316L SS), process specimens with scanning speeds at 350 mm/s, 650 mm/s, 950 mm/s, and 1250 mm/s were prepared using the SLM technique in this paper. The quasistatic and dynamic compressive mechanical properties of the four specimens were tested by electrohydraulic servo experimental machine and Hopkinson compression bar experimental device, and the mechanical differences of the specimens were analyzed by microscopic observation. Finally, the modified Johnson-Cook (J-C) model was adopted to describe the dynamic mechanical properties of SLM 316L SS. Results showed that the four process steel specimens exhibited typical viscoplastic characteristics and significant strain rate strengthening effects in the mechanical property tests. Moreover, the scanning speed significantly affects the internal defects and melt pool characteristics of the SLM 316L specimens, and the yield strength decreases significantly with the disappearance of the melt pool characteristics. Finally, the modified J-C model can better describe the mechanical behavior of SLM 316L SS material more accurately. This study can provide theoretical references for improving the fabrication process of SLM 316L SS to broaden the practical application of this material.

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Dynamic Mechanical Properties and Constitutive Model of Selective Laser Melting 316L Stainless Steel at Different Scanning Speeds

Cited by 2 publications

References 27 publications

Impact of process parameters on the dynamic behavior of Inconel 718 fabricated via laser powder bed fusion

Impact of process parameters on the dynamic behavior of Inconel 718 fabricated via laser powder bed fusion

Mechanical Properties and Constitutive Model of Selective Laser Melting 316L Stainless Steel at Different Scanning Speeds

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