Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

This paper reports on the performance of Electron Beam Welded (EBW) low alloy steel AISI 4140 and stainless steel AISI 304 in air as well as molten salt environments of Na2SO4-60%V2O5 and K2SO4-60% NaCl at 650(C. The corrosion kinetics has been established by thermo-gravimetric technique during the initial stages. In this work, X-ray diffraction, scanning electron microscopy/energy-dispersive analysis and electron probe micro analysis techniques were used to analyze the corrosion products. It is well observed from the experimental results that the weldments suffered accelerated corrosion in K2SO4-NaClenvironment and showed spalling/sputtering of the oxide scale. Furthermore, corrosion resistance of weld interface was found to be lower than that of parent metals in molten salt environment. It is also inferred from the results that NaCl is the one of the main corrosive species in hot corrosion, involving mixtures of K2SO4-NaCl and which is responsible for internal corrosion attack.

Department of Manufacturing Engineering

School of Mechanical Engineering

Vellore Campus

Department of Design and Automation

Department of Chemistry

School of Advanced Sciences

Communications in Computer and Information Science Trends in Intelligent Robotics, Automation, and Manufacturing

A Comparative Study of Oxidation and Hot Corrosion of Electron Beam Welded Low Alloy Steel and Stainless Steel in Different Corrosive Environments

Hot corrosion of Gas Tungsten Arc Welded (GTAW) AISI 304 and AISI 4140 dissimilar weldment exposed in air as well as molten salt environment of Na2SO4-60%V2O5 and K2SO4-60% NaCl are discussed. Weight gain studies were done for composite specimens containing both weld metal and heat-affected zone. The results indicated that the specimens were more corroded in molten salt environment as compared to air oxidation. Also weld interface of the samples showed more attack than base metals.