Author
Sajadifar, S. V., Ghobadlou, Ali Hosseınzadeh, Richter, J., Krochmal, M., Wegener, T., Bolender, A., Heidarzadeh, A., Niendorf, T., Yapıcı, Güney Güven
Publication Date
2022-10
Publication Place
-
Wiley
Subject
Fractures, Friction stir processing, Laser powder bed fusion, Mechanical properties, Microstructures, Strengths
Type
Periodical
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
1438-1656
Record ID
b8e17e1b-0ca7-4210-9a1e-530b7e4c7072
Library Location
Mechanical Engineering
Date
2022-10
Notes
Deutsche Forschungsgemeinschaft ; Bilim Akademisi
Sample Text
The novel combination of friction stir processing (FSP) and additive manufacturing (AM) is studied herein. Laser-based powder bed fusion of metals (PBF-LB/M) is used to establish 316 L stainless steel with a bimodal microstructure. Upon FSP, the as-built bimodal microstructure with an average grain size of 179 μm is transformed into the unimodal microstructure containing ultrafine grains with an average grain size of 1.2 μm. Results obtained by mechanical testing reveal that after FSP; the hardness, the yield point, and the ultimate strength of additively manufactured 316 L are enhanced by 45%, 77%, and 62%, respectively. Microstructure assessment reveals that such a unique improvement in the mechanical properties is due to considerable structural refinement leading to grain boundary strengthening. Energy-dispersive X-Ray diffraction analysis reveals that phase transformation does not occur upon FSP. Fracture analysis further indicates that severe plastic deformation (SPD) during FSP can promote the transformation of coarse voids to fine voids and, hence, densification of as-built parts.
DOI
10.1002/adem.202200384
Cilt
24
