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ArticleName Research of ultrasonic method for assessing the porosity of additive manufacturing products
DOI 10.17580/tsm.2019.05.05
ArticleAuthor Aleshin N. P., Grigoriev M. V., Shchipakov N. A., Nerush S. V.

“Welding and Testing” Academic Centre at the Bauman Moscow State Technical University, Moscow, Russia:

N. P. Aleshin, Director
M. V. Grigoriev, Deputy Director for Research
N. A. Shchipakov, Head of Laboratory, e-mail:


All-Russian Institute of Aviation Materials, Moscow, Russia:
S. V. Nerush, Head of Laboratory


Additive technologies are widely used in various industries. The use of additive technologies provides new design possibilities, provides greater freedom in choosing the configuration of the product, its internal structure, which allows to optimize the mass and functional parameters of the part. One of the most characteristic types of additive manufacturing defects is porosity – volume-distributed micropores with a size of less than 40 microns. To ensure the quality of finished products created using additive technologies, it is necessary to develop non-destructive testing methods to determine the volume fraction of pores. In this article, the study of the volume fraction of pores of samples made by selective laser fusion technology was carried out. Various methods for determining the volume fraction of pores in products, their advantages and disadvantages are considered. Samples for research were made of two materials: corrosion-resistant steel and cobalt. The different value of the pore volume fraction in the samples was achieved by varying the modes and parameters of the selective laser melting process, in particular, the scanning speed and laser power. Some samples were subjected to hot isostatic pressing. The studies were carried out by comparing the results obtained in the study of sections and non-destructive ultrasonic method. The velocity of propagating longitudinal ultrasonic waves was determined experimentally in the study of samples by ultrasonic method. The correlation between the velocity of longitudinal waves and the volume fraction of pores in the samples is shown. It is seen that the qualitative dependences for corrosion-resistant steel and cobalt have the same character, and only the coefficients in the regression equations differ.

keywords Selective laser melting, additive manufacturing, defect, porosity, volume fraction of pores, ultrasonic inspection, a rapid method for porosity measurements, the velocity of ultrasonic wave, longitudinal wave

1. Grigoriants A. G. et al. Laser additive technology in mechanical engineering : Learner’s guide. Ed. by A. G. Grigoriants. Moscow : Izdatelstvo MGTU im. N. E. Baumana, 2018. 278 p.
2. Rudskoy A. I. et al. Additive technology : Learner’s guide. Saint Petersburg : Izdatelstvo Politekhnicheskogo universiteta, 2017. 252 p.
3. Zhao X., Wei Q. S., Gao N., Zheng E. L., Shi Y. S., Yang S. F. Rapid fabrication of TiN/AISI 420 stainless steel composite by selective laser melting additive manufacturing. Journal of Materials Processing Technology. 2019. Vol. 270. pp. 8–19. DOI: 10.1016/j.jmatprotec.2019.01.028
4. Ulu E., Huang R., Kara L. B., Whitefoot K. S. Concurrent structure and process optimization for minimum cost metal additive manufacturing. Journal of Mechanical Design, Transactions of the ASME. 2019. Vol. 141, Iss. 6. pp. 061701. DOI: 10.1115/1.4042112
5. Petrovsky P. V., Cheverikin V. V., Sokolov P. Yu., Davidenko A. A.Dependence of the structure and properties of 03Kh16N15M3 steel on the geometry of cellular structures obtained by the selective laser melting method. Chernye Metally. 2019. № 3. P. 49–53.
6. Alyoshin N. P., Murashov V. V., Grigoryev M. V., Yevgenov A. G., Karachevtsev F. N., Shchipakov N. A., Vasilenko S. A. Defects of heat-resistant alloys synthesized by the method of selective laser melting. Inorganic Materials: Applied Research. 2017. Vol. 8, Iss. 1. pp. 27–31. DOI: 10.1134/S2075113317010038
7. Aleshin N. P., Murashov V. V., Evgenov A. G., Grigoriev M. V., Shchipakov N. A., Vasilenko S. A., Krasnov I. S. The classification of flaws of metal materials synthesized by the selective laser melting method and the capabilities of nondestructive testing methods for their detection. Russian Journal of Nondestructive Testing. 2016. Vol. 52, No. 1. pp. 38–43. DOI: 10.1134/S1061830916010022
8. Panakkal J. P. Use of longitudinal ultrasonic velocity as a predictor of elastic moduli and density of sintered uranium dioxide. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 1991. Vol. 38, Iss. 3. pp. 161–165. DOI: 10.1109/58.79598
9. Hernandez M. G. et al. Application of a micromechanical model of three phases to estimating the porosity of mortar by ultrasound. Cement and Concrete Research. 2006. Vol. 36. pp. 617–624. DOI: 10.1016/j.cemconres.2004.07.018
10. Boccaccini D. N., Boccaccini A. R. Dependence of ultrasonic velocity on porosity and pore shape in sintered materials. Journal of Nondestructive Evaluation. 2007. Vol. 16, Iss. 4. pp. 187–192.
11. Kreher W. et al. Ultrasonic wave in porous ceramics with non-spherical holes. Ultrasonics. March 1977. pp. 70–74. DOI: 10.1016/0041-624X(77)90068-3
12. Slotwinski J. A., Garboczi E. J., Hebenstreit K. M. Porosity measurements and analysis for metal additive manufacturing process control. Journal of Research of the National Institute of Standards and Technology. 2014. Vol. 119. pp. 494–528. DOI: 10.6028/jres.119.019
13. Slotwinski J. A., Garboczi E. J. Porosity of additive manufacturing parts for process monitoring. Paper presented at AIP Conference Proceedings. Baltimore, Maryland, USA. 2013. July. DOI: 10.1063/1.4864957
14. Karthik N. V., Gu H., Pal D., Starr T., Stucker B. High frequency ultrasonic non destructive evaluation of additively manufactured components. Paper presented at the 24th Annual International Solid Freeform Fabrication (SFF) Symposium. Austin, TX, USA. 2013. pp. 311–325.
15. Kim F. H., Moylan S. P., Garboczi E. J., Slotwinski J. A. Investigation of pore structure in cobalt chrome additively manufactured parts using X-ray computed tomography and three-dimensional image analysis. Additive Manufacturing. 2017. Vol. 17. pp. 23–38. DOI: 10.1016/j.addma.2017.06.011

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