About this Abstract |
Meeting |
Superalloys 2024
|
Symposium
|
Superalloys 2024
|
Presentation Title |
The Relationship Between Strain-age Cracking and the Evolution of γ' in Laser Powder-Bed-Fusion Processed Ni-based Superalloys |
Author(s) |
Jonathon Markanday, Neil D'Souza, Nicole Church, James Miller, Jessica Pitchforth, Leigh Connor, Stefan Michalik, Bryan Roebuck, Nicholas Jones, Katerina Christofidou, Howard J. Stone |
On-Site Speaker (Planned) |
Jonathon Markanday |
Abstract Scope |
Factors affecting strain-age cracking (SAC) have been quantitatively assessed in a range of Ni-base superalloys with differing contents. Differences in the amount of present in the as-built condition of HA282, STAL 15DE, CM247LC and IN713LC are highlighted. In the as-built condition, are absent in HA282, but appear as nano-clusters in IN713LC. On heating, precipitates coherently in the phase, increasing the yield strength. The kinetics of precipitation are dependent on the heating rate and precipitation terminates at different temperatures in different alloys. The propensity to SAC is assessed via volume changes accompanying precipitation, increase in elastic modulus accompanying precipitation and a loss in ductility/grain boundary cohesive strength with increasing temperature. A marked feature of additively built microstructures is the dramatically low grain boundary cohesive strength at 800 C, which is related to the segregation within the terminal liquid film at the grain boundary. The most important factor contributing to SAC is the lack of ductility and reduced grain boundary cohesive strength. |
Proceedings Inclusion? |
Definite: At-meeting proceedings |