About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing: Materials Design and Alloy Development IV: Rapid Development
|
Presentation Title |
High Strength Fe-C-Cu Alloys for Laser Powder Bed Fusion |
Author(s) |
Andrew Bobel, Louis G Hector, Lee Casalena |
On-Site Speaker (Planned) |
Andrew Bobel |
Abstract Scope |
Two alloys from the Fe-C-Cu system were designed and evaluated as potential high strength non-stainless steel replacements for printable 17-4 PH stainless steel in laser powder bed fusion (LPBF). A computational materials design approach was employed to determine Ni and Co free printable compositions. Custom gas atomized powders were acquired and characterized. Parameter development was performed to obtain specimens with consolidation greater than 99.8% density. A single step heat treatment was developed capable of acting as both a stress relief and strengthening treatment thereby reducing post-processing time and cost. SEM and STEM revealed the heat-treated microstructure to be lath martensite with 2.6-2.8 nm diameter Cu precipitates, the same as previously reported critical diameters for BCC Cu strengthening. Tensile tests demonstrated that yield strengths of both Fe-C-Cu alloys (1208 and 1274 MPa) were comparable to 17-4 PH (1288 MPa). |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Iron and Steel, Characterization |