Effect of solution treatment temperature(975,1000,1025 and 1050℃)on the microstructure and mechanical properties of a 15-5PH precipitation hardened stainless steel with ultra-low carbon(w(C)≤0.01％)was investigated.The microstructure of the tested steel solution treated at different temperatures was observed by metallographic microscope,the room temperature tensile properties and impact absorbed energy of the tested steel solution treated at different temperatures were determined,and the fracture morphologies of the tensile specimens and impact specimens were observed by scanning electron microscope.The results show that when the solution treatment temperature is increased from 975℃ to 1050 ℃,the average grain size of the tested steel grows from 27 μm to 150 μm,the elongation decreases from 14.5％to 8.5％,the reduction of area decreases from 55％to 32％,and the impact absorbed energy decreases from 35.6 J to 6.6 J,however the change of its strength is not obvious.
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