| | Test condition | Treatment |
| | A | As received wheel | | B | A + solution treated at 475°C + quenched in 30°C water + aging at 120°C for 12 h | | C | B + shot peening | | E | A + solution treated at 475°C + quenched in 30°C water + aging at 107°C for 6 h + aging at 177°C for 9 h + shot-peening | | F | A + solution treated at 475°C + quenched in 30°C water + shot-peening + aging at 120°C for 12 h |
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