1 Introduction
2 Materials and Experimental Method
2.1 Materials and Processes
Label | Heat treatment conditions |
---|---|
HT-1 | 600 ºC/1 h/AC |
HT-2 | 700 ºC/1 h/AC |
HT-3 | 750 ºC/1 h/AC |
HT-4 | 600 ºC/4 h/AC |
HT-5 | 600 ºC/4 h/AC+700 ºC/0.5 h/AC |
2.2 Experimental Methods
3 Results and Discussion
3.1 Microstructure Characterization
Alloy types | Proportion of α phase, % | Morphology |
---|---|---|
Hot-pressed | 0 | |
HT-600 ºC/1 h/AC | 9.8±3.7 | Fine acicular and globular |
HT-700 ºC/1 h/AC | 32.7±4.5 | Acicular and globular |
HT-750 ºC/1 h/AC | 33.8±4.2 | Coarse globular and acicular |
HT-600 ºC/4 h/AC | 30.7±8.8 | Fine acicular |
HT-600 ºC/4 h+700 ºC/0.5 h/AC | 36.5±3.8 | Acicular and globular |
3.2 Mechanical Properties
Alloy conditions | YS , MPa | UTS, MPa | Elongation, % | Bending strength, MPa |
---|---|---|---|---|
Hot-pressed | … | 675±12 | 0.98±0.04 | 1181±28 |
HT-600 ºC/1 h | … | 1285±14 | 1.16±0.04 | 1983±20 |
HT-700 ºC/1 h | 1190±10 | 1205±20 | 1.74±0.02 | 2298±16 |
HT-750 ºC/1 h | … | 1068±10 | 1.08±0.04 | 2124±15 |
HT-600 ºC/4 h | … | 1442±10 | 1.25±0.03 | 1995±10 |
HT-600 ºC/4 h+700 ºC/0.5 h | 1390±20 | 1425±12 | 2.47±0.07 | 2565±35 |