About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Symposium
|
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Presentation Title |
Effect of Surface Preparation on LPBF 17-4PH Mechanical Properties |
Author(s) |
Joseph Bartolai, Natalie Nukaya |
On-Site Speaker (Planned) |
Joseph Bartolai |
Abstract Scope |
Typically, when mechanical properties are reported for a combination of a feedstock material and a Laser Powder Bed Fusion (LPBF) additive machine, they are derived from experiments performed on test specimen machined out of blanks produced by the LPBF machine. The as-machined surface condition of these test specimens does not match the as-built surface condition of most end-use parts produced by LPBF, leading to mechanical property discrepancies. This work finds a statistically significant difference between the two surface conditions when comparing quasi-static tension and impact testing results. This discovered result is found consistently among samples built using the same 17-4PH stainless steel feedstock and H900 heat treatment process across two different manufacturer’s LPBF machines and process parameters. The findings suggest that designers use mechanical properties of the appropriate surface condition (as-built or as-machined) to optimize material usage and mechanical properties from LPBF produced parts. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |