About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanics at the Extremes: Bridging Length-Scales From Nanoscale to Bulk
|
| Presentation Title |
Effect of strain rate on the stability of reverted austenite in 18 Ni M250 Maraging steel |
| Author(s) |
Ratnesh Yadav, Yuto kamo , T Iwamoto , M. P. Gururajan , Prita Pant , B.N.Jaya |
| On-Site Speaker (Planned) |
B.N.Jaya |
| Abstract Scope |
Maraging steel, composed of a soft martensite phase, undergoes diffusion-driven precipitation (e.g., Ni3Ti, Fe2Mo, Fe7Mo6) and reversion to austenite upon ageing. The morphology, volume fraction and composition of reverted austenite (RA) varies with aging conditions. RA transforms to martensite upon straining, exhibiting transformation-induced plasticity, leading to strain hardening. The stability of RA under deformation is influenced by its grain size, test temperature and strain rate. In this study, 18Ni Maraging 250 steel was overaged at 540 °C for 3 h to investigate the stability of RA under high strain rate (10³ s⁻¹) conditions using Split Hopkinson Pressure Bar (SHPB), and compared to quasi-static (QST) (10-3 s⁻¹) compression. XRD and electron microscopy analysis showed that the extent of RA transformation was ~4% less under HSR conditions compared to QST for the same applied strain. These results are discussed in the context of adiabatic heating, heterogeneous deformation and dislocation mobility under HSR conditions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Other, Other |