Second phase precipitation process of high nitrogen austenitic stainless steel was studied by XRD,OM,SEM and TEM.The morphology and the type of precipitated phases were analyzed and determined.The experimental results show that the microstructure of the solution treated specimen is composed of single-phase austenite grains and partial twins.After aging at 800-1040℃ for 2 h,Cr2N precipitates in the steel,and the number of Cr2N increases first and then decreases,which reaches the peak at 860 ℃.The precipitated phases of the tested steel are mainly carbide,nitride and intermetallic compound σ phase.Aged at 800 ℃,the intermetallic compound σ phase is precipitated,and M23C6 carbide is precipitated at 860℃.Only Cr2N is precipitated after aging at 920 ℃,and MX phase is precipitated at 1040℃.
high nitrogen austenitic stainless steelprecipitated phaseagingmicrostructure
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