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Characterization of compact heat exchangers manufactured by laser powder bed fusion technology

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Abstract

This study presents the material characterization of compact heat exchanger manufactured by laser powder bed fusion. Twelve tensile specimens were manufactured, six horizontally and six vertically, to evaluate the material properties. The mechanical properties of the samples manufactured horizontally resulted in yield strength and ultimate tensile strength higher than the samples produced in the vertical orientation. A pressure vessel specimen was manufactured for hydrostatic test, which was submitted and approved in leak tests, with a leakage rate below \({10}^{-7}\) mbar/s. The hydrostatic pressure tests demonstrated that the core was suitable for application with pressure up to 700 bar. The average surface roughness was 9.28 µm, measured on the lateral face and 5.84 µm on the upper face, a difference justified by the staircase and remelting effects. Finally, a complete heat exchanger prototype was manufactured and tested. Rectangular samples were produced alongside with the heat exchanger and it was observed that the manufacturing parameters were adequate to obtain a dense part with 99.8% of apparent density, obtained by the image analysis method. Also, the average roughness on the core was 14.38 µm.

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Abbreviations

A:

Area, cross-sectional area (m2)

VED:

Volumetric energy density (J/mm)

c :

Cold face

TS:

Test specimen

HT:

Heat treatment

AM:

Additive manufacturing

SEM:

Scanning electron microscope

OM:

Optical microscope

L-PBF:

Laser powder bed fusion

Ra:

Average roughness

SLS:

Selective laser sintering

SS:

Stainless steel

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Acknowledgements

We would like to express our gratitude to FAPESC, CAPES, CNPq, PETROBRAS S.A and ANP (Agência Nacional de Petróleo, Gás Natural e Biocombustível) for supporting this research.

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Authors and Affiliations

  1. Thermal Fluid Flow Group – T2F, Department of Mobility Engineering, Federal University of Santa Catarina, Joinville, SC, Brazil

    G. Zilio, D. G. Borges, M. V. V. Mortean, J. L. G. Oliveira, G. B. Dutra & K. V. Paiva

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  1. G. Zilio
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  2. D. G. Borges
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  3. M. V. V. Mortean
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  4. J. L. G. Oliveira
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  5. G. B. Dutra
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  6. K. V. Paiva
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Correspondence to G. Zilio.

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Zilio, G., Borges, D.G., Mortean, M.V.V. et al. Characterization of compact heat exchangers manufactured by laser powder bed fusion technology. J Braz. Soc. Mech. Sci. Eng. 45, 393 (2023). https://doi.org/10.1007/s40430-023-04311-w

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