| About this Abstract |
| Meeting |
Superalloys 2024
|
| Symposium
|
Superalloys 2024
|
| Presentation Title |
Using “Microstructure Informatics” to Understand Abnormal Grain Growth Factors in Powder Metallurgy Ni-based Superalloys |
| Author(s) |
Luis F. Arciniaga, Pascal Thome, Kevin Severs, Sammy Tin |
| On-Site Speaker (Planned) |
Luis F. Arciniaga |
| Abstract Scope |
Advanced electron back scatter diffraction (EBSD) and electron dispersive spectroscopy (EDS) techniques were used to systematically quantify meso-scale microstructural descriptors in an advanced powder processed polycrystalline Ni-base superalloy containing elevated levels of refractory alloying additions. The microstructural changes of the alloy as a function of effective strain were tracked and related to the subsequent heat-treated microstructures. This emerging field of “microstructure informatics” extends beyond the conventionally used metrics of grain and precipitate sizes and distributions. Due to the multidimensional nature of the data, manual microstructure characterization becomes virtually impossible, especially when a multitude of different material states must be considered. This motivated the development of an automated microstructure characterization procedure, which extracts useful geometric, crystallographic, and chemical microstructure features through a batch process. These features provide a level of microstructure detail that has not traditionally been demonstrated at a statistically significant scale capable of effectively capturing the level of intrinsic heterogeneity that is present in polycrystalline Ni-base superalloys. In this study, microstructural descriptors from the deformed material were evaluated and used to understand the grain growth response during super-solvus heat treatment. Compared to traditional qualitative and semi-quantitative approaches for characterizing microstructures, the innovative methodology used in this investigation provide insightful, quantitative microstructure metrics that lead to the generation of new knowledge and scientific understanding. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |