Microstructural Characterization and Mechanical Properties of LDSS2101 Using Gas Tungsten Arc Welding

The Lean Duplex Stainless Steels (LDSS) consisting of low alloying element composition are a good alternative in comparison to the Duplex stainless steels and Austenitic stainless steels because of their low cost. These LDSSs are commonly used in nuclear and marine industries, desalination plants, and pressure vessels where enhanced mechanical and corrosion behavior are major requirements. In this paper, LDSS2101 is welded using Gas tungsten arc welding by heat input 0.85 kJ/mm in order to enhance the microstructural and mechanical properties. The influence of the heat input is studied to understand the microstructural characterization using optical microscopy and scanning electron microscope. The mechanical properties such as tensile and impact energy using fracture analysis are examined. Also, the scratch hardness is evaluated and compared with the micro-hardness to understand the performance of weldments. The effect of heat input carried on GTAW of 2101 has led to the significant microstructural evolution in the welded zone with good austenite reformation. The mechanical results of the weldment showed the enhancement in welded zone which is likely suitable for industrial applications.