Steps | Coarse grain specimen | Ultrafine grain specimen |
1 | Solid solution traetment (850˚C/1h) | Solid solution traetment (850˚C/1h) |
2 | Water quenching | Water quenching |
3 | Pre-straining (4%, 6%, and 8%) | Producing UFG microstructure by CGP |
4 | Baking (250˚C and 250˚C for 20 min) | Pre-straining (4%, 6%, and 8%) |
5 | Tensile testing at room temperature | Baking (250˚C and 250˚C for 20 min) |
6 | - | Tensile testing at room temperature |