In-situ Synchrotron Investigations of Additive Manufacturing parts for Ni-base Superalloys
|Coordinator||SWERIM AB - Material- och Processutveckling|
|Funding from Vinnova||SEK 499 000|
|Project duration||November 2020 - May 2022|
|Venture||Research infrastructure - utilisation and collaboration|
|Call||Industrial pilot projects for utilisation of large-scale infrastructures for neutron and photon based techniques – 2020|
Purpose and goal
The goal of this project is to optimize the AM process chain for blade alloys and alloys for extreme conditions, with the purpose of avoiding cracks in such alloys. Cracking, for this type of alloys (when AM-built), occur during subsequent heat treatment due to mechanisms not yet fully understood. Conventional lab techniques only allow characterization before and after cracks have appeared, and not while they emerge. In this project the High Energy Materials Science (HEMS) beamline at Petra III will be used to observe crack emergence during simulated heat treatments
Expected results and effects
If new heat treatment recipes were found that prevent formation of cracks, it could unlock a new group of alloys for production via AM. Components composed of these alloys are extremely difficult and expensive to manufacture by conventional means. One obstacle is welding, which is nearly impossible for these alloys. AM would enable optimization of components currently composed of these alloys. As well as use of these alloys in new components. Improved efficiency of gas turbines, including those adapted for hydrogen, is one direct outcome.
Planned approach and implementation
WAXS and SAXS patterns give information on the development of phase fractions and precipitate size, as well the induced stress during simulated heat treatments. The standard heat treatment for cast material, which is currently used by Siemens, is known to induce cracking in AM-built material. This heat treatment will be used as starting point, to observe formation of cracks and the causing mechanism. Depending on the result, the effect of heating rate, intermediate soak, or cooling will be investigated to understand if and how crack formation can be avoided.