Effect of magnetic field applied during fusion welding of 2205 duplex stainless steel on resistance to fatigue corrosion cracking
2205 Duplex Stainless Steel (DNS) is an alloy containing 22% Cr and 5% Ni. The steel microstructures a d-ferrite matrix with BCC structure with face-centred intercalated cubic lattice with g-austenite in the ratio 50:50. DNS is used in industry for its high mechanical and corrosion resistance, better than ferritic or austenitic stainless steels. During the welding process a low intensity electromagnetic interaction was induced using axial external electromagnetic fields 0; 3 and 12 mT. Microstructural analysis and evaluation of localised corrosion resistance under pitting corrosion conditions were carried out. Resistance to crack formation and growth was also evaluated in a low cycle corrosion fatigue test mode to monitor short crack behaviour. Low intensity electromagnetic interaction (3 mT) was found to improve localised corrosion resistance, but at 12 mT no improvement was observed compared to 0 mT. Cracking resistance and fracture toughness were also improved by the application of 3 mT external electromagnetic fields due to the modification of microstructural evolution during the thermal welding cycle. Based on the experimental investigation, the criterion value of SIF for 2205 stainless steel duplex is determined. It was determined that each case requires a separate study, as the impact on the durability of the structural element of any parameter is felt, but the given approach is positive because the systematic express analysis of various structural elements in aggressive environments, which can be fulfilled in engineering practice, is possible.