Influence of Welding Heat Input on Microstructure and Hardness of SAF2304 Duplex Stainless Reinforcing Steel
The microstructure and microhardness of SAF2304 duplex stainless reinforcing steel weld seam under different surfacing welding current were studied. The results show that as welding current increases from 100 A into 130 A, the austenite fraction increases from 24.8% into 33.6%. The microhardness drops by 4HV in the heat affect zone(HAZ). The content of precipitates increase, the microhardness drops to 10 HV in the welding beam. The softening phenomenon appears in the HAZ after welding, however, the impact on the steel performance is not obvious.