# Compressive Behavior of Inconel 625 and Ti-6 Al-4V Strut Lattices Fabricated by LPBF
## 5 Conclusions  
The goal of this present study was to assess the performances of four strut lattices manufactured by LPBF from Inconel 625 and Ti-6 Al-4V alloys under compressive loads. The performance of the proposed lattices was assessed by a static finite element analysis and experimental testing. Based on the results obtained, the following was concluded:  
A similar tendency was observed in the case of static finite element analysis and experimental results.  
The best compressive performances were recorded for the octet lattice type, followed by the truncated octahedron and Kelvin lattice, and the worst compressive properties were recorded for the re-entrant lattice.  
Regarding material performance, both materials exhibited similar first maximum compressive strengths. Nevertheless, a significant difference was observed in yield strength, with Ti-6 Al-4V demonstrating higher values compared to Inconel 625.  
Depending on the cell type, the average first maximum compressive strength for the Ti-6 Al-4V lattices was between 30.39 and 290.17 MPa, and the compressive elastic modulus was between 1.74 and 4.72 GPa.  
Depending on the cell type, the average first maximum compressive strength for the Inconel 625 lattices was between 16.22 and 258.71 MPa, and the compressive elastic modulus was between 1.13 and 4.46 GPa.  
Experimentally, Inconel 625 was characterized by a bending-dominant mode regardless of the lattice type tested. Ti-6 Al-4V was characterized more by a stretch-dominant mode, especially in the case of the re-entrant lattice.  
A more ductile behavior was observed in the nickel-based superalloy additive-manufactured specimens compared with the titanium alloy-manufactured specimens. Different heat treatment routes should be applied to improve the ductility of additive-manufactured titanium alloy.  
As a general conclusion of the study, it can be stated that the cell type has a great influence on the compressive performance of additive-manufactured lattice structures. Comprehensive analyses should be performed to assess the performance of multiple lattices and additive-manufactured materials performance under different loads. Further studies will be performed on the compressive performance of different cell types (including triply periodic minimal surface (TPMS) cells), and the influence of cell parameters on mechanical performances.  
M.R.C.: Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Validation, Roles/Writing--original draft, and Writing--review and editing. T.A.B.: Investigation, Methodology, Software, Validation, Visualization, Roles/Writing--original draft, and Writing--review and editing. A.P.: Data curation, Formal analysis, Methodology, Validation, Visualization, Roles/Writing--original draft, and Writing--review and editing. All authors have read and agreed to the published version of the manuscript.  
This work was carried out within \"Nucleu\" Program through The National Plan for Research, Development and Innovation 2022-2027, funded by Romanian Ministry of Research, Innovation and Digitization, Grant no. 31N/2023, Project PN23.12.01.01.  
The data presented in this study are available on request from the corresponding author. The data are not publicly available due to privacy.  
No potential conflicts of interest were reported by the authors.