We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
On the Friction Stir Processing of Additive‐Manufactured 316L Stainless Steel.
- Authors
Sajadifar, Seyed Vahid; Hosseinzadeh, Ali; Richter, Julia; Krochmal, Marcel; Wegener, Thomas; Bolender, Artjom; Heidarzadeh, Akbar; Niendorf, Thomas; Yapici, Guney Guven
- Abstract
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.
- Subjects
FRICTION stir processing; CRYSTAL grain boundaries; YIELD strength (Engineering); ULTIMATE strength; STAINLESS steel; GRAIN size
- Publication
Advanced Engineering Materials, 2022, Vol 24, Issue 10, p1
- ISSN
1438-1656
- Publication type
Article
- DOI
10.1002/adem.202200384