Table 1 Annealing conditions, constituent phases, and room-temperature tensile properties of ultra-high-strength steels.
Steel Group | Annealing Condition | Constituent Phase | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|---|---|
Present 1 | 650 °C/10 min | γ + α | 1436 | 1521 | 49.5 |
Present 2 | 700 °C/10 min | γ + α | 987 | 1404 | 54.1 |
HPF 14 | 950 °C/15 min | α′ | 987 | 1493 | 8.1 |
HPF 24 | 900 °C/20 min | α′ | 1097 | 1611 | 4.0 |
TWIP 128 | 550 °C/30 min | γ | 1075 | 1150 | 22.5 |
TWIP 240 | 500 °C/15 min | γ | 1450 | 1600 | 25.0 |
Q&P 141 | 880 °C/45 min + 360 °C/10~20 min | α′ + αB + γret | 1084 | 1541 | 28.6 |
Q&P 241 | Quenching + 360 °C/45 min | α′ + αB + γret | 1165 | 1614 | 25.6 |
