Hardening of Additive Manufactured 316L Stainless Steel by Using Bimodal Powder Containing Nanoscale Fraction
Aleksandr M. Filimonov,
Oleg A. Rogozin,
Denis G. Firsov,
Yulia O. Kuzminova,
Semen N. Sergeev,
Alexander P. Zhilyaev,
Marat I. Lerner,
Nikita E. Toropkov,
Alexey P. Simonov,
Ivan I. Binkov,
Ilya V. Okulov,
Iskander S. Akhatov,
Stanislav A. Evlashin
Affiliations
Aleksandr M. Filimonov
Center for Design, Manufacturing & Materials (CDMM), Skolkovo Institute of Science and Technology, 30 Bolshoy Boulevard Str., bld. 1, 121205 Moscow, Russia
Oleg A. Rogozin
Center for Design, Manufacturing & Materials (CDMM), Skolkovo Institute of Science and Technology, 30 Bolshoy Boulevard Str., bld. 1, 121205 Moscow, Russia
Denis G. Firsov
Center for Design, Manufacturing & Materials (CDMM), Skolkovo Institute of Science and Technology, 30 Bolshoy Boulevard Str., bld. 1, 121205 Moscow, Russia
Yulia O. Kuzminova
Center for Design, Manufacturing & Materials (CDMM), Skolkovo Institute of Science and Technology, 30 Bolshoy Boulevard Str., bld. 1, 121205 Moscow, Russia
Semen N. Sergeev
Institute of Metals Superplasticity Problems of the Russian Academy of Sciences (IMSP), 39 Stepana Khalturina Str., 450001 Ufa, Russia
Alexander P. Zhilyaev
Institute of Metals Superplasticity Problems of the Russian Academy of Sciences (IMSP), 39 Stepana Khalturina Str., 450001 Ufa, Russia
Marat I. Lerner
Institute of Strength Physics and Materials Science of Siberian Branch of the Russian Academy of Sciences (ISPMS), 2/4 Akademicheskii pr., 634055 Tomsk, Russia
Nikita E. Toropkov
Institute of Strength Physics and Materials Science of Siberian Branch of the Russian Academy of Sciences (ISPMS), 2/4 Akademicheskii pr., 634055 Tomsk, Russia
Alexey P. Simonov
Center for Design, Manufacturing & Materials (CDMM), Skolkovo Institute of Science and Technology, 30 Bolshoy Boulevard Str., bld. 1, 121205 Moscow, Russia
Ivan I. Binkov
Materials and technology, Bauman Moscow State Technical University, 2 Baumanskaya Str., bld. 5/1, 105005 Moscow, Russia
Ilya V. Okulov
Faculty of Production Engineering, University of Bremen, Badgasteiner Str. 1, 28359 Bremen, Germany
Iskander S. Akhatov
Center for Design, Manufacturing & Materials (CDMM), Skolkovo Institute of Science and Technology, 30 Bolshoy Boulevard Str., bld. 1, 121205 Moscow, Russia
Stanislav A. Evlashin
Center for Design, Manufacturing & Materials (CDMM), Skolkovo Institute of Science and Technology, 30 Bolshoy Boulevard Str., bld. 1, 121205 Moscow, Russia
The particle size distribution significantly affects the material properties of the additively manufactured parts. In this work, the influence of bimodal powder containing nano- and micro-scale particles on microstructure and materials properties is studied. Moreover, to study the effect of the protective atmosphere, the test samples were additively manufactured from 316L stainless steel powder in argon and nitrogen. The samples fabricated from the bimodal powder demonstrate a finer subgrain structure, regardless of protective atmospheres and an increase in the Vickers microhardness, which is in accordance with the Hall-Petch relation. The porosity analysis revealed the deterioration in the quality of as-built parts due to the poor powder flowability. The surface roughness of fabricated samples was the same regardless of the powder feedstock materials used and protective atmospheres. The results suggest that the improvement of mechanical properties is achieved by adding a nano-dispersed fraction, which dramatically increases the total surface area, thereby contributing to the nitrogen absorption by the material.
