About this Abstract |
| Meeting |
2026 AWS Professional Program
|
| Symposium
|
2026 AWS Professional Program
|
| Presentation Title |
Evaluation of Ductility Dip Cracking Susceptibility in Weldments of Additively Manufactured Cu-Ni Alloys |
| Author(s) |
Seth E. Hixson, Boian Alexandrov |
| On-Site Speaker (Planned) |
Seth E. Hixson |
| Abstract Scope |
The objective of this work is to evaluate the susceptibility to ductility dip cracking (DDC) of additively manufactured (AM) CuNi 70-30. We will quantify DDC susceptibility of material made with laser powder bed fusion (LPBF) and wire arc directed energy deposition (WA-DED) processes and compare results to cast and wrought counterparts to evaluate the performance of AM materials. DDC is a warm cracking phenomenon that primarily occurs in highly restrained multipass welds of FCC alloys. Ductility loss is typically observed in areas that experience grain boundary sliding along migrated grain boundaries in the temperature range between 50% and 80% of a material’s solidus temperature. Grain boundary sliding leads to void nucleations that under sufficient strains can become crack initiation sites. In welding and AM, strains are induced by uneven thermal expansion and contraction. DDC has been observed in FCC materials since the 1950’s and while some research has been performed exploring DDC susceptibility within the Cu-alloy space, there is no work analyzing the DDC susceptibility of CuNi AM material. To characterize the DDC susceptibility, strain to fracture (STF) and fixed displacement thermal cycling (FDTC) tests will be completed utilizing the GleebleTM thermo-mechanical simulator. This presentation describes STF and FDTC procedures, quantifies and ranks the DDC susceptibility of the tested materials, and characterizes the DDC failure mechanism. |
| Proceedings Inclusion? |
Undecided |