Development of shielded metal arc welding electrodes to achieve carbide-free bainitic weld microstructures

Sundaram, S. et al (2021) Development of shielded metal arc welding electrodes to achieve carbide-free bainitic weld microstructures. Welding in the World. ISSN 00432288

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Carbide-free bainite (CFB) microstructures containing a mixture of nano-sized retained austenite laths and bainitic ferrite exhibit a good combination of strength, ductility, and toughness. In this work, an attempt was made to identify welding electrode compositions with a carbon content of about 0.35 to 0.5 wt.% to achieve carbide-free bainite microstructures in multi-pass shielded metal arc welds. Suitable alloy compositions were designed using a commercial neural network–based database, considering thermodynamic parameters such as allotropic phase boundary (XTo), ΔGɣ-ɑ (driving force for transformation) and martensite start temperatures. Three different alloy compositions were identified using this approach. Shielded metal arc welding (SMAW) electrodes were fabricated with the compositions identified and the samples extracted from the weld deposits were used for dilatometer studies, metallurgical characterisation, and mechanical property evaluation. Based on the results, an optimised electrode composition and welding parameters were identified to stabilise the carbide-free bainitic microstructures in weld metal.

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IITH Creators:
IITH CreatorsORCiD
Ram, G.D.J 0000-0002-7580-763X
Item Type: Article
Uncontrolled Keywords: Bainitic microstructures, Carbide-free bainites, Electrode composition, Martensite start temperature, Mechanical property evaluation, Shielded metal arc welding, Shielded-metal-arc welds, Thermodynamic parameter
Subjects: Others > Metallurgy Metallurgical Engineering
Divisions: Department of Material Science Engineering
Depositing User: Mrs Haseena VKKM
Date Deposited: 09 Dec 2021 11:23
Last Modified: 09 Dec 2021 11:23
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