Weld Microstructure and Properties of SAF2205 and SAF2507 Duplex Stainless Steel

The microstructure and properties in base metal,weld seam and heat affected zone of SAF2205 and SAF2507 steel welded by SMAW were analyzed comparatively.The results show that the microstructure of two materials in the weld seam and heat affected zone are different.Compared with SAF2507,the microstructures of SAF2507 weld seam and heat affected zone are larger,and show widmanstatten structure.As for SAF2507,the phase proportion of heat affected zone is less affected by the welding,and is more stable.As for SAF2205,the mechanical properties of the heat affected zone is more influenced by welding heat.The corrosion resistance of base metal,heat affected zone and weld seam of SAF2507 are much better than the corresponding areas of SAF2205.