15-5PH precipitation-hardened stainless steel was solution treated at 1040℃ for 1 h,and then aged at 480 ℃ for different time(1,2,4 h).The microstructure,fracture morphology and properties were observed and tested to study the effect of aging time on its mechanical properties at room temperature and-50 ℃.The results show that the tensile and impact properties of the 15-5 PH steel at room temperature don't change significantly with the aging time increasing.The tensile properties at-50℃ have no obvious change,but the impact absorbed energy is significantly improved,the impact absorbed energy is increased from 31.5 J to 77.5 J,due to the longer the aging holding time,the higher the reversed austenite content in the steel,resulting in better low-temperature impact property.
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