Influence of Heat Input on Microstructure and Mechanical Properties of Laser Weld Metal in 2507 Duplex Stainless Steel by Different Welding Speed and Welding Power

This manuscript attempts to explore the macroscopic morphology microstructural aspects and mechanical properties of different laser welding speed power on 2.5 mm thick DSS joint. Through evaluation 12 groups samples with parameters, we found that optimal process parameters were a 6mm/s, 1.6 kW 8 mm/s, 1.7 kW. When heat input was 2.125 kJ/cm, content ferrite austenite relatively uniform, ratio close 1:1. We hardness weld metal zone slightly higher than base metal, an average value 330 HV. microhardness welded joint better other reaching 400 HV in zone. The tensile strength enhanced increase input, maximum 900 MPa. SEM analysis, fracture locations specimens all zone, had large number dimples, belonging ductile fracture.