Influence of Welding Processes on Microstructure and Hardness of Welded Joints of UHSL Steel Fe‐26Mn‐10Al‐1.2Si‐2.2Cr‐1.8Ni‐0.15V‐1C

Ultrahigh‐Strength Lightweight Steels (UHSL steels) are advanced structural materials designed to combine extremely high strength with reduced density. They typically achieve tensile strengths above 1.5 GPa while maintaining good ductility and toughness. This is often accomplished by alloying with elements such as Mn, Al, and Si, which lower the steel's density and stabilize complex microstructures like austenite and martensite. Owing to their excellent strength‐to‐weight ratio, UHSL steels are promising for aerospace, automotive, and defense applications, where both mechanical performance and weight reduction are critical. This paper presents experiments on welding Fe‐26 Mn‐10Al‐1.2Si‐2.2Cr‐1.8Ni‐0.15V‐1C steel using two methods: MMA and MAG, and investigates the microstructural features of the formation of welded joints with a thickness of 9 mm, as well as their hardness.