Author
Ghobadlou, Ali Hosseinzadeh, Radi, Amin, Richter, J., Wegener, T., Sajadifar, S. V., Niendorf, T., Yapıcı, Güney Güven
Publication Date
2021-08
Publication Place
-
Elsevier
Subject
Selective laser melting, Laser powder bed fusion, AlSi12, Severe plastic deformation, Equal channel angular extrusion/pressing, Microstructure, Porosity, Mechanical behavior, Strength, Fracture
Type
Periodical
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
1526-6125
Record ID
f9bca42d-75b0-4d59-ae4f-bafda3a18213
Library Location
Mechanical Engineering
Date
2021-08
Notes
BAGEP Award of the Science Academy ; Ozyegin University ; Hessen State Ministry for Higher Education, Research and the Arts - Initiative for the Development of Scientific and Economic Excellence (LOEWE) ; German Research Foundation (DFG) European Commission
Sample Text
For the first time, the novel combination of multi-pass equal channel angular extrusion/pressing (ECAE/P) and selective laser melting (SLM) was investigated. Herein, four passes of ECAP via route Bc at 150 °C were applied as a severe plastic deformation (SPD) technique on the SLM as-built AlSi12 to promote superior mechanical properties. The microstructure and mechanical behavior of AlSi12 fabricated by SLM were studied before and after ECAP, applying several mechanical and microstructural characterization techniques. Results of the tensile experiments revealed that the yield point, the ultimate strength, and the ductility of the as-built sample were improved by 56%, 11%, and 55% after 4 passes of ECAP, respectively. This enhancement is attributed to the effective grain refinement and the persisting silicon phase network after SPD as evidenced by electron backscatter diffraction and elemental mapping results. Moreover, micro-computed tomography analysis disclosed that ECAP considerably reduces the remnant porosity of the post-treated SLM AlSi12 samples eventually further affecting the strength of the ultra-fine grained AlSi12 in a positive way. Findings presented herein indicate that it is viable to utilize ECAP as a post-AM processing tool for mechanical property improvement of laser powder bed fused microstructures with the virtue of enhanced densification. Even if geometrical restrictions exist in ECAP, results obtained herein are transferrable to other SPD techniques with suitable processing windows, which would pave the way to advanced properties of adequately post-treated conditions.
DOI
10.1016/j.jmapro.2021.05.070
Cilt
68
