Table 2: The effect of heat-treatment on the average mechanical properties of AISI 4140 steel alloy.
Austenitizing temperature and time | Austempering temperature and time | UTS (MPa) | YS (MPa) | % Elongation | Strain hardening exponent ("n") |
950 C/2 hours | 322 C/2 hours | 1286 ± 129 | 1011 ± 130 | 6.1 ± 3.0 | 0.15 ± 0.02 |
Annealed [14] | 655 | 415 | 25 | --- | |
885 C/1 hour [15] | 349 C/1 hour | 1527 | 1369 | 5.9 | --- |
885 C/1 hour [15] | 322 C/1 hour | 1646 | 1481 | 5.5 | --- |
850 C/40 min [16] | Oil Quenched + 300 C/60 min | 1720 | 1528 | 11.9 | --- |