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Inhomogeneity of CoCrW powder products manufactured by SLM technology

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Abstract

The article deals with selective laser melting process using CoCrW powder. Our aim was to identify the influence of product position on the building platform and the re-use of powder on roughness, hardness, porosity and corrosion properties of materials, made under uniform process parameters. Roughness was tested with a stylus profilometer, corrosion resistance by electrochemical impedance spectroscopy and linear polarization. Porosity was assessed by image analysis on metallographic sections taken in two mutually perpendicular directions. The same metallographic sections were used to measure microhardness. The results confirmed a statistically significant dependence of the surface roughness with the position on the platform as well as with the recycling of the powder used. The corrosion resistance of the materials was excellent. Increased porosity values and lower hardness occurred in the middle of the building platform. The reason for the variation of the properties within the building platform can be seen in the unequal laser input energy in the individual positions of the plate.

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Abbreviations

CTE :

Coefficient of thermal expansion

SCE :

Saturated calomel electrode

OCP :

Open circuit potential

H0 :

Null hypothesis

H1 :

Alternative hypothesis

p-value :

Probability of obtaining test results

ψ :

Laser energy input

α :

Significance level

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Acknowledgments

his research is the result of implementation of the following projects supported by Ministry of Education, Science, Research and Sport of the Slovak Republic, VEGA 1/0154/19, VEGA 1/0179/19, KEGA 040TUKE-4/2019, Slovak Research and Development Agency, APVV-17-0278 and European Structural Funds: Medical University Science Park in Košice (MediPark), ITMS 26220220185, Medical University Science Park in Košice (MediPark, Košice — Fáza II). ITMS2014+: 13011D103 and the Project No. 2018/14432:126C0, which is supported by the Ministry of Education, Science, Research and Sport of the Slovak Republic within the provided incentives for research and development from the state budget in accordance with Act No. 185/2009 Coll. on incentives for research and development. Operational Program Integrated Infrastructure for the project: open scientific community for modern interdisciplinary research in medicine (OPENMED), ITMS2014+: 313011V455, co-financed by the European Regional Development Fund.

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Authors and Affiliations

  1. Department of Technology, Materials and Computer Supported Production, Faculty of Mechanical Engineering, Technical University of Košice, Mäsiarska 74, 040 01, Košice, Slovakia

    Anna Guzanová, Dagmar Draganovská, Janette Brezinová, Erik Janoško & Róbert Moro

  2. Department of Applied Mathematics and Informatics, Faculty of Mechanical Engineering, Technical University of Košice, Letná 9, 042 00, Košice, Slovakia

    Gabriela Ižaríková

  3. Department of Biomedical Engineering and Measurement, Faculty of Mechanical Engineering, Technical University of Košice, Letná 9, 042 00, Košice, Slovakia

    Viktória Rajt’úková, Jozef Živčák & Radovan Hudák

Authors
  1. Anna Guzanová
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  2. Dagmar Draganovská
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  3. Gabriela Ižaríková
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  4. Janette Brezinová
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  6. Jozef Živčák
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  8. Erik Janoško
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  9. Róbert Moro
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Corresponding author

Correspondence to Anna Guzanová.

Additional information

Anna Guzanová is an Associate Professor of Mechanical Engineering, Technical University of Košice, Slovakia. She obtained her Doctorate from Technical University of Košice in 2003. Her research interests include mechanical properties of materials, thermal spraying, hard surfacing, corrosion, joining of materials, tribology.

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Guzanová, A., Draganovská, D., Ižaríková, G. et al. Inhomogeneity of CoCrW powder products manufactured by SLM technology. J Mech Sci Technol 35, 4389–4404 (2021). https://doi.org/10.1007/s12206-021-0910-8

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  • DOI: https://doi.org/10.1007/s12206-021-0910-8

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