About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Ferrous Process Metallurgy
|
| Presentation Title |
Direct Powder Forging of Mechanically Alloyed Ferritic Steels: Oxide Dispersion Effects on Microstructure and Tensile Performance |
| Author(s) |
Himanshu Pal, Vikram Vasant Dabhade |
| On-Site Speaker (Planned) |
Himanshu Pal |
| Abstract Scope |
The microstructure and mechanical properties of mechanically alloyed (MA) 15Cr- oxide dispersion strengthened (ODS) ferritic steel and its non-ODS counterpart consolidated by direct powder forging (DPF) were evaluated. Both the steels were fully densified after DPF, with the ODS variant exhibiting finer grain structure (~800 nm) compared to the non-ODS steel (~2 μm) due to homogenously dispersed Y₂O₃ nanoparticles during MA. Tensile testing revealed the ODS steel had superior yield strength (605 MPa vs. 386 MPa) and ultimate tensile strength (852 MPa vs. 655 MPa) at room temperature, attributed to grain boundary strengthening and Orowan mechanisms from nano-oxide dispersoids. However, the non-ODS steel demonstrated higher ductility (23% vs. 18% elongation), linked to its coarser grains and absence of stress-concentrating oxides. Elevated temperature tests at 700°C showed the ODS steel retained 35% of its room-temperature strength, outperforming the non-ODS variant (20% retention), highlighting the thermal stability imparted by Y₂O₃ particles. |