| About this Abstract |
| Meeting |
2024 AWS Professional Program
|
| Symposium
|
2024 AWS Professional Program
|
| Presentation Title |
Loss of Low Temperature Charpy Impact Energy in Additively Manufactured Duplex Stainless Steels |
| Author(s) |
Andrew D. Iams, Todd A. Palmer |
| On-Site Speaker (Planned) |
Andrew D. Iams |
| Abstract Scope |
Room temperature static mechanical properties of standard and super duplex stainless steels fabricated using directed energy deposition additive manufacturing are often similar to or even exceed those observed in the wrought condition. However, the performance of these alloys in the as-deposited condition under impact loading conditions at temperatures on the order of -50ºC were significantly degraded compared to their wrought counterparts. These highly degraded impact energies were attributed to a combination of complex interactions between process-related defects, the ferrite and austenite phases, and a network of oxygen rich inclusions. Crack paths were found to follow deposition passes in the as-deposited condition, were high fractions of brittle ferrite and process-related defects were observed. Post-process hot isostatic pressing increased the austenite fraction and decreased defects, thus improving impact properties compared to the as-deposited condition. However, oxide inclusions remained within the microstructure which contributed to low impact energies compared to traditional wrought products. |
| Proceedings Inclusion? |
Undecided |