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Khatri, Bharatlal
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article
Mechanical and intergranular corrosion properties of auto TIG welded TP347H-T91 dissimilar weldme
Abstract
Introduction : The Biggest challenges coal-fired power plants are facing are improving their energy efficiencies and reducing their environmental impact due to CO2 and NOX emissions, can be attained by maximizing the steam pressure and temperature. However, the operating temperatures and pressures in boiler materials were restricted due to limited weldability of essential dissimilar joints between Austenitic Stainless Steel (ASS) and Creep-Enhanced Ferritic Steel (CEFS) due to carbon migration and sensitization. Present research work provides enhanced metallurgical and mechanical properties of weldment by optimizing the welding process and welding parameters. Aim : The aim of the manuscript is to explores the welding compatibility of TP347H (stabilized ASS) with solution annealed T91 (CEFS), by Auto TIG welding technique, such that carbon migration at the fusion line of SA213 T91 and sensitization in the heat affected zone of TP347H can be minimized. Methods : Influence of Auto TIG welding parameters on the mechanical, microstructure, and corrosion properties are studied and discussed. Carbon migration, mechanical and corrosion properties for lower (0.792 KJ/mm) and higher (1.124 KJ/mm) heat inputs weldments were compared. Investigation on mechanical properties test such as tensile, hardness, and root bend performed as per American Society of Mechanical Engineers (ASME) Section IX. Optical microscopy and Analytical Scanning Electron Microscope (SEM) coupled with Energy Dispersive Spectroscopy (EDS) have been performed to investigate carbon migration and sensitization behaviour. Sensitization susceptibility further validated by American Society for Testing and Materials (ASTM) A 262 Practice E. Results : Investigation on tensile, hardness, and root bend tests revealed that mechanical properties for lower heat input weldment were superior. Restricted carbon migration due to optimized heat input improves mechanical properties and this was evidenced by satisfactory results of the bend test which showed no opening at ...