PSI - Issue 50

V. Ilinykh Artem et al. / Procedia Structural Integrity 50 (2023) 113–118 Illinykh Artem V. et al./ Structural Integrity Procedia 00 (2023) 000 – 000

117

5

Table 2. . Torsion mechanical properties of samples from ASP35 powder grown in different directions.

ultimate shear strain, γ u ,

conditional tensile yield strength,

proportionality limit,

tensile strength τ b , Mpa

shear modulus G, Gpa

build direction, º

τ 0,3 , MPa

rad

τ pt , Mpа

0

21,6 22,2 24,1 23,5 24,6

350 350 330 335 355

135 145 135 130 150

180 180 175 170 195

0,153 0,131 0,110 0,119 0,123

30 45 60 90

Anisotropy coefficient, (a max -a min ) /a max *100%

12

7

13

13

28

To assess the anisotropy of mechanical properties, an anisotropy coefficient is introduced, which is calculated as the ratio of the maximum difference between the values to the largest value, multiplied by 100%. Tables 1 and 2 show that the elastic and plastic properties of the material obtained by the SLM method from ASP35 aluminum powder have an anisotropy of mechanical properties which is more pronounced in torsion than in tension. For tension the anisotropy of mechanical properties is 4.5 – 9% (excluding relative elongation and relative contraction), and for torsion it is 7 – 13% (excluding ultimate shear strain). The anisotropy coefficient for the relative elongation and the limiting shear angle have similar values. 4. Conclusions The article presents the results of tensile and torsion tests of cylindrical specimens grown in five different directions by selective laser melting from ASP35 aluminum powder. It is shown that the tensile mechanical properties do not have a pronounced dependence on the direction of growth. It was found that during torsion the highest values of elastic, plastic and strength properties are observed in specimens grown at an angle of 90 degrees. In torsion tests it was noticed that the coefficient of anisotropy of mechanical properties has larger values and a range of values than in tensile tests. Acknowledgements The study was carried out with the financial support of the Russian Foundation for Basic Research within research r_RECs_Perm region, project no. 20-48-596007. References Ig isenov B.K., Selective laser sintering of metals in additive technologies / B.K.Igisenov, V.Е. Kasutin, А.V. Kreymer, К.V. Vi blov // Bulletin of contemporary research. - 2018. - No. 4.2 (19). - pp. 235-239. Dinin N.V., Zavodov A.V., Oglodkov M.S., Hasikov D.V. Influence of the parameters of the selective laser melting process on the structure of the aluminum alloy of the system AL-SI-MG // VIAM Proceedings. – 2017. – No. 10(58). – pp. 1 – 14. John H. Martin, 3D printing of high-strength aluminium alloys/Brennan D. Yahata, Jacob M. Hundley, Justin A. Mayer, Tobias A. Schaedler, Tresa M. Pollock//NATURE - vol 5 4 9 – 2017 – pp. 365-379 Dirk Herzog, Additive manufacturing of metals / Vanessa Seyda, Eric Wycisk, Claus Emmelmann// Acta Materialia 117 (2016) 371-392 John J. Lewandowski, Mohsen Seifi, Metal Additive Manufacturing: A Review of Mechanical Properties// Annu. Rev. Mater. Res. 2016. 46:14.1 – 14.36 Xiaoli Zhao, Comparison of the microstructures and mechanical properties of Ti – 6Al – 4V fabricated by selective laser melting and electron beam melting / Shujun Li, Man Zhang, Yandong Liua, Timothy B. Sercombe, Shaogang Wang, Yulin Hao, Rui Yang, Lawrence E. Murr//Materials and Design 95 (2016) 21 – 31 Takahiro Kimura, Takayuki Nakamoto, Microstructures and mechanical properties of A356 (AlSi7Mg0.3) aluminum alloy fabricated by selective laser melting // Materials and Design 89 (2016) 1294 – 1301 Demkovich N.A., Volkov I.A., Yablochnikov E.I Application of numerical modeling systems in the implementation of new production technologies. // Bulletin of the Samara Scientific Center of the Russian Academy of Sciences. - 2016. - No. 4-3. – pp. 459-463