Abstract
The dynamic compress properties of air-cooled bainitic 971 steel, which depend on the heat treatment process, length-diameter ratio and test temperature, were investigated with the SHPB dynamic mechanical properties testing system, metallurgical microscope and the S-4800 scanning electronic microscope. The results indicate that the dynamic compression yield strength of 971 steel is increased by 8% with the raised length-diameter ratio when 971 steel went through the tempering at 500°C after normalizing, while increased by 20% through the tempering at 650°C after normalizing. 971 steel has the low temperature sensitivity, its dynamic compression yield strength at -40°C is lower about 20% than it at room temperature. The inner structure of adiabatic shear band of the hat-shaped sample is denser than outer one with melting appearance and morphology of ridge-like and porous network structure.
| Original language | English |
|---|---|
| Pages (from-to) | 486-488+496 |
| Journal | Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology |
| Volume | 31 |
| Issue number | 4 |
| Publication status | Published - Apr 2011 |
Keywords
- Adiabatic shear band
- Air-cooled bainite steel
- Dynamic compression
- Hat-shaped sample
- Low temperature