The Effects of Heat Inputs on LDSS 2101 GTAW and SMAW Weld Microstructure and Mechanical Behavior

• Autorzy: Sharma Ambuj , Gudikandula Sravanthi

Identyfikatory

DOI

10.24425/amm.2024.149798

• Języki publikacji: EN

Abstrakty

EN

The welding has been utilized to stabilize the phase fractions in the microstructure of lean duplex stainless steel (LDSS) to build massive mechanical structures. The influence of heat input on the microstructure, mechanical properties, and corrosion behavior of LDSS 2101 during the gas tungsten arc welding (GTAW) and shielded metal arc welding (SMAW) processes is investigated in the present work. Specifically, we compared the outcomes between low heat input (LHI) at 0.85 kJ/mm and high heat input (HHI) at 1.3 kJ/mm for both welding techniques. Throughout the welding process, ER2209 filler wire was utilized. To assess the microstructural changes in the weldments, we employed an optical microscope, a scanning electron microscope, and X-ray diffraction. The results revealed that the volume phase fraction of ferrite was significantly higher in the LHI sample of GTAW compared to HHI GTAW and all SMAW welds. LHI GTAW welds have 18.2% greater Charpy impact toughness than LHI SMAW, whereas HHI GTAW has 35.7% higher than HHI SMAW specimens. The microhardness of the LHI GTAW weldments increased (from 230 ± 3.2 to 252 ± 4.8 HV₁₀), whereas the microhardness of the LHI SMAW weldments increased (from 227 ± 2.8 to 246 ± 5.2 HV₁₀). GTAW exhibited a fine grain structure, showcasing favorable tensile properties and higher hardness compared to SMAW. Conversely, the SMAW welds and their heat-affected regions exhibited coarse grain structures. These findings highlight the superior performance of GTAW in terms of microstructural characteristics, and mechanical properties when working with LDSS 2101 in comparison to SMAW.

Słowa kluczowe

EN

gas tungsten arc welding; shielded metal arc welding; phase fraction; mechanical properties; LDSS2101

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2024
• Tom: Vol. 69, iss. 2
• Strony: 685--697
• Opis fizyczny: Bibliogr. 41 poz., fot., rys., tab.

Twórcy

autor

Sharma Ambuj

• VIT-AP University, School of Mechanical Engineering, Amaravati, Andhra Pradesh, India-522237

• https://orcid.org/0000-0002-2993-7118

autor

Gudikandula Sravanthi

• VIT-AP University, School of Mechanical Engineering, Amaravati, Andhra Pradesh, India-522237

• https://orcid.org/0000-0003-3482-1467

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