Influence of Solution Treatment Temperature on Microstructure and Pitting Corrosion Behavior of Heat Rolling 2205 Duplex Stainless Steel

The effect of solution treatment on microstructure and pitting corrosion property of heat rolling 2205 duplex stainless steel was investigated by means of OM and immersing in a 10%FeCl₃ solution test.The results show that as the solution treatment temperature increase,the fibrous structure morphologies of austenite in hot rolling 2205 duplex stainless steel gradually evolves into equiaxed rod-like and island-like morphology,and evenly distributed in 2205 duplex stainless steel,and the volume fraction ferrite increases.A suitable volume fraction of α/γ-phase is distributed uniformly after solution treatment at 1 100 ℃.In a 10%FeCl₃ solution test,pitting corrosion resistance of 2205 duplex stainless steel increases with increasing the ferrite fraction.When the solution treatment temperature is 1 100 ℃,no obvious corrosion area appeares in the 2205 duplex stainless steel,thus the steel exhibits the best resistance to pitting corrosion.