Microstructure and Mechanical Properties of Laser-induction Hybrid Welding 2205 Duplex Stainless Steel

摘要

In this paper, the differences of microstructure and mechanical properties of 2205 duplex stainless steel between preheating laser-induction hybrid welding (LIHW) and post-heating LIHW were compared by the optical microscope, nano-indentation. Vickers hardness and tensile machines. The results of the nano-indentation experiment show that the elastic modulus and hardness of ferrite are 42% and 64% larger than that of austenite. respectively. With the increase of LIHW heating power, the austenite proportion increases distinctly. Furthermore, the increase of the austenite results in the decrease of hardness and ultimate tensile stress. By quantifying the microstructure and mechanical properties, pre-heating LIHW exhibits greater superiority than post-heating LIHW with a heating power of 49.1 kW, laser power of 3 kW and welding speed of 30 mm/s.