Gudikandula S, Sharma A. Microstructural Behavior and Corrosion Analysis of Lean Duplex Stainless
Steel 2101 under the Influence of Variable Heat Inputs Using Gas Tungsten
Arc Welding. IJMSE 2022; 19 (4) :1-11
URL:
http://ijmse.iust.ac.ir/article-1-2792-en.html
Abstract: (9846 Views)
The lean duplex stainless steels (LDSS) have excellent features due to the microstructural phase
combination of austenite and ferrite grains. These steels have low Ni and Mo contents which can reduce the cost
and stabilize the austenite fraction in the microstructure. In recent years, welding is used to enhance the
microstructural behaviour of LDSS. In this paper, Gas tungsten arc welding (GTAW) was performed on LDSS
S32101 with different heat energy inputs and varying welding currents. The influence of heat inputs (0.85 and 1.3
kJ/mm) on welded samples was investigated to study the microstructural behaviour, phase balance, and mechanical
& corrosion performance. The microstructures studies were carried out using an optical microscope, scanning
electron microscope and X-ray diffraction. The effect of Heat input led to the significant microstructural evolution
in weld metals with high austenite reformation. The microstructure of weldments consisted of inter-granular
austenite (IGA), grain boundary austenite (GBA) and Widmanstatten austenite (WA). Important mechanical
properties such as tensile strength and micro-hardness were investigated to understand the performance of
weldments. The polarization method was used to understand the corrosion behaviour of weldment in a 3.5% NaCl
solution. The experimental results showed enhanced properties of welds that could be suitable for industrial
applications.
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- Gas tungsten arc welding (GTAW) is performed on LDSS 2101 with different heat energy inputs.
- The effect of Heat input led to the significant microstructural evolution in weld metals with high austenite reformation.
- Important mechanical properties are investigated to understand the performance of weldments
- The polarization method is used to understand the corrosion behaviour of weldment in a 3.5% NaCl solution