Microstructure, Hardness and Corrosion Behavior of Gas Tungsten Arc Welding Clad Inconel 625 Super Alloy over A517 Carbo
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Microstructure, Hardness and Corrosion Behavior of Gas Tungsten Arc Welding Clad Inconel 625 Super Alloy over A517 Carbon Steel Using ERNiCrMo3 Filler Metal Farhad Ostovan, Ehsan Hasanzadeh, Meysam Toozandehjani, Ehsan Shafiei, Khairur Rijal Jamaluddin, and Astuty Amrin (Submitted January 7, 2020; in revised form August 25, 2020; Accepted: September 8 2020) In this study, Inconel 625 coating was deposited on the surface of A517 quenched and tempered low-alloy A517 steel using gas tungsten arc welding (GTAW) in order to increase the service life of the A517 substrate. For this purpose, Inconel 625 coating was deposited on steel surface by applying ERNiCrMo3 filler at different welding currents of 80, 100 and 120 A. The results showed that the microstructure of Inconel 625 coating consisted of a fully austenitic phase which was solidified having dendritic morphology, while A517 was found to be tempered martensitic. The average hardness of Inconel 625 coatings deposited at different welding currents was more than 230 HV. Evaluation of corrosion behavior also illustrated a better corrosion resistance of Inconel 625 coating than A517 base metal. The corrosion rate of Inconel 625 coating in 80 A, 100 A and 120 A samples was 0.435, 0.143 and 0.165 mpy, respectively, which were negligible in comparison with that of A517 steel (24.2 mpy). Keywords
electron, joining, microscopy, stainless, steel, super alloys, welding
1. Introduction A517 steel is one in a variety of quenched and tempered low-alloy steels with high strength, toughness and good weldability, low ratio of cost to strength of which makes it suitable for manufacturing of boilers and pressure vessels, storage and carrier tanks, refinery and petrochemical equipment as well as submarine equipment. Generally, the reason for using low carbon steels is that under certain temperature and pressure amounts, these steels have good mechanical properties and are more economical than stainless steels (Ref 1-4). Recognition of the mechanical properties and welding characteristics of A517 steel is of particular importance due to its specific applications under various environmental conditions. In the case of marine applications, this alloy is exposed to severe (corrosive) conditions which affect the mechanical and particularly corrosion behavior of this alloy (Ref 5, 6). From practical point of view, the use of expensive and corrosion resistant alloys is not a good practice, and the use of a low-cost material is economically preferable. In such cases, it is recommended for the surface of the components to be treated (or protected) by surface coatings using different coating methods including gas
Farhad Ostovan, Ehsan Hasanzadeh, and Ehsan Shafiei, Department of Material Science and Engineering, Islamic Azad University, Bandar Abbas Branch, Bandar Abbas, Hormozgan, Iran; and Meysam Toozandehjani, Khairur Rijal Jamaluddin, and Astuty Amrin, Razak Faculty of Technology and Informatics, UTM Kuala Lumpur, Jalan Sultan Yahya Petra, 54100 Kuala Lumpu
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