|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Deformation Induced Microstructural Modification
||High Pressure Torsion Processed Maraging steels: Microstructure and Mechanical Behaviour
||Kevin Jacob, Deepesh Yadav, Saurabh Dixit, Anton Hohenwarter, Balila Nagamani Jaya
|On-Site Speaker (Planned)
Maraging steels are Fe-Ni martensitic steels with an unusual combination of strength and ductility. Strengthening results due to nano sized intermetallic precipitates that form in the highly dislocated matrix, on aging. High Pressure Torsion (HPT) has been utilised in this study to produce maraging steel 250 grade (AMS 6512) with finer lath spacing and a very high dislocation density, acting as nucleation sites for precipitation, and reverted austenite formation. Aging such a structure accelerates the precipitation kinetics substantially, whereas grain fragmentation and high dislocation density also leads to early onset of recrystallization all of which have subsequent bearing on the mechanical response of these maraging steels. HPT processed maraging steels show a 27% increase in strength while after aging, they show a 70% increase in strength corresponding to the non-HPT counterparts. Their ductility however shows a reverse trend, due to the change in morphology of the precipitates after HPT processing.