| About this Abstract |
| Meeting |
2024 AWS Professional Program
|
| Symposium
|
2024 AWS Professional Program
|
| Presentation Title |
Hot Cracking Mechanism in a Ni-base Superalloy Fabricated by Electron Beam Powder Bed Fusion |
| Author(s) |
Carolin Fink, Alivia Mourot, Brian Welk, Sriram Vijayan, Joerg R. Jinschek |
| On-Site Speaker (Planned) |
Carolin Fink |
| Abstract Scope |
Hot cracking phenomena have long been a topic of particular interest in IIW Commissions II and IX. Commission activities include the exchange of recent research results, the discussion of different proposed cracking mechanisms and contributions to the standardization efforts for hot cracking tests. This presentation will provide an introduction into these commission activities and will then discuss hot cracking in a Ni-base superalloy fabricated by electron beam powder bed fusion. Understanding mechanisms of microstructure and defect formation are key for successful fabrication of superalloy components and increased confidence in the use of additive manufacturing processes. While boundary conditions differ in additive processes as compared to conventional arc welding, the presence of liquid film and thermal stresses still interact to drive hot cracking. Cracks were observed to propagate intergranular, preferentially along high angle grain boundaries. The role of grain boundary enrichment by minor elements on liquid film formation will be discussed. |
| Proceedings Inclusion? |
Undecided |