| About this Abstract |
| Meeting |
Superalloys 2024
|
| Symposium
|
Superalloys 2024
|
| Presentation Title |
E-1: Beyond Hot Cracking: Impact of Minor Elements on a Novel Ni-based Superalloy for Additive Manufacturing |
| Author(s) |
Kai Dorries, Christoph Haberland, Juri Burow, Joachim Rösler, Bodo Gehrmann, Christina Somsen, Sebastian Piegert, Håkan Brodin |
| On-Site Speaker (Planned) |
Kai Dorries |
| Abstract Scope |
Minor elements such as boron, carbon, and zirconium have been used for many decades to improve the high-temperature properties of Ni-based superalloys. However, the advances in additive manufacturing technologies and the resulting popularity have put these elements in a bad light since they have been identified to be the major cause of hot cracking problems. This study covers the influence of these elements on hot cracking but its focus lays on their impact on strain-age cracking (SAC) and mechanical properties. The impact of these elements has been studied in four versions of a high tantalum-containing novel Ni-based superalloy that is being developed for Powder Bed Fusion-Laser Beam/Metals (PBF-LB/M). Increasing the boron content from 0.007 wt.% to 0.019 wt.% leads to severe hot cracking, but reduces SAC during the heat treatment. The addition of 0.022 wt.% zirconium does not increase the hot cracking susceptibility but increases the SAC susceptibility. The variation of minor elements does not affect room temperature tensile properties, but an increased zirconium and boron content increases the elongation at fracture at 850°C. The alloys with a low boron and medium boron content show a high notch-sensitivity during stress-rupture tests, which leads to failure in the fillet of the sample. Only the boron and zirconium alloys were able to achieve valid stress-rupture results. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |