Effect of vanadium content on the microstructure and properties of duplex stainless steel TDVS2001 was investigated.The precipitates and microstructure were characterized by metallographic microscope,SEM,EDS and TEM.The results indicate that when the vanadium content is less than 0.11％,there is no vanadium precipitate in the metallographic structure and the mechanical properties are slightly improved.When the vanadium content is 0.27％,a large number of nano-scaled vanadium precipitates occur in the ferrite phase,the yield strength of the material increases by 68 MPa,while the impact absorbed energy has no obvious change.The vanadate is confirmed to be VN precipitation by transmission electron microscope.The smaller grain size and nano-scaled VN precipitation are the main reasons for the improvement of strength.
TDVS2001 stainless steelstrengthVN precipitateferrite phaseimpact absorbed energy
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