About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Alloy Phase Transformations at Elevated Temperatures
|
| Presentation Title |
Cooling-Rate-Driven Microstructural Evolution in Novel Ni-based Cr-Fe-Al-Ti Alloys |
| Author(s) |
Rakhmatjon Gaipov, Elyorjon Jumaev, Omon Sultonov, Jakhongir Bakirov, Mukhiddin Abduazimov, Nilufarkhon Sattarova, Ki Buem Kim |
| On-Site Speaker (Planned) |
Rakhmatjon Gaipov |
| Abstract Scope |
In this work, newly developed Ni-based superalloys N4 (Ni48(AlCrFe)15Ti7) and N6 (Ni48(CrCuFe)12.5Al7.5Ti7) were investigated to understand the cooling rate effects on microstructure, phase stability, and mechanical characteristics that are essential factors for eventual commercialization. Ingots were produced by three casting approaches (arc and induction melting) and cooled for 3, 60, and 600 minutes. In N4, the slowest cooling (600 min) indicated significant dendritic growth and the appearance of a BCC phase, whereas the microstructure of N6 remained largely unchanged, retaining γ + γ′ phases under all conditions. Nevertheless, nano-scale structural changes were observed in N6, with characteristic features coarsening from ~28 nm to ~126 nm. Regardless of cooling rate, both alloys preserved their chemical compositions, exhibited Ni-rich γ′ precipitates, and maintained hardness values of 45–52 HRC. These results highlight cooling rate as a critical lever for tailoring the microstructure and performance of multicomponent Ni–Cr–Fe–Al–Ti superalloys. |