About this Abstract |
Meeting |
Superalloys 2024
|
Symposium
|
Superalloys 2024
|
Presentation Title |
C-5: Revisiting Nanoscale Microstructural Features of Alloy 680 to Understand its Remarkable Mechanical Strength in the As-welded Condition |
Author(s) |
Cleiton Carvalho Silva, Rafaella de Souza Silva, Émerson Mendonça Miná, Ricardo Marinho Reppold, Marcelo Torres Pisa Paes, Giovani Dalpiaz, Marcelo Ferreira Motta, Hélio Cordeiro de Miranda, Irina Wossack, Alisson Kwiatkowski da Silva, Christian H Liebscher |
On-Site Speaker (Planned) |
Cleiton Carvalho Silva |
Abstract Scope |
The present study assesses the microstructure of a new Ni-based alloy filler metal, Inconel® 680, at high resolution to understand the underlying mechanisms behind its remarkable mechanical properties. Investigations using aberration-corrected (scanning) transmission electron microscopy (TEM/STEM) were performed to complement the previous microstructural analysis. The results from TEM analysis confirmed Nb-rich C14-type Laves phase precipitation, besides different types of carbides in the interdendritic spacings. However, the advanced microstructural characterisation has also shown a heterogeneous pattern in terms of microstructure between the cellular-dendrite core and interdendritic region. A higher dislocation density was noticed in the interdendritic spacings accompanied by nanometric precipitation. These nanoprecipitates were identified as being tined globular-shape -Ni3Nb phase. The -Ni3Nb phase precipitation resulted from an intense microsegregation of Nb during the solidification. This precipitation of the -Ni3Nb phase plays an essential role in the enhanced yield strength of alloy 680. |
Proceedings Inclusion? |
Definite: At-meeting proceedings |