Optimization of Melt Zone Area for Electron Beam Welded Hastelloy C-276 Sheet and Study of Corrosion Resistance of the Optimized Melt Zone in 3.5 wt% NaCl Aqueous Solution

Inconel 718 alloy is a chromium-titanium-nickelbased austenitic alloy with increased strength and better resistance to carburization and oxidation at increased temperatures. This is an important and efficient alloy material for the power plants of next generation [1]. These alloys can be used in sea water, power plant applications with temperature ranges up to 900ºC. The combination of resistance and the improved mechanical property makes this alloy useful in case of various applications, such as exposure of long-term and higher temperatures in corrosive area. High temperature tubes of heat exchanger in gascooled nuclear reactors and super heater tubes are the other applications of Inconel 718 alloy [2]. In addition, EBW process is a metal fabrication technique in the presence of multi-factors and multi-objectives. *Author for correspondenceThis connection of normal metals, like aluminium, steel, and magnesium of 1mm to 6mm thickness in almost all positions can be done using this process [3]. The weld joint quality highly depends on the parameters of the input process and the control of this input process parameter acts as a basic problem to the manufacturer in obtaining increased weld quality in welded joint [4]. Highly skilled engineers or operators select the parameters depending on trial and error method in order to produce a welded joint with necessary indications, but the selection of parameters using this method was time consuming [5]. The welds are utilized to find, whether they are suitable to meet the all the required specification [6]. Many researchers have studied the effect of mechanical properties of Inconel-718 alloy material and few authors published about fabrication, solidification and characterization of these alloys. It is understood that there is lack of papers on the effect of electron beam welding parameters and with their responses of bead width and depth of penetration with quality optimization.

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“…Bal et al [8] studied the response effects on welding strength were analyzed for the optimized welding are of EBW by the use of GRA.…”

Section: Literature Reviewmentioning

confidence: 99%

Optimization of responses in electron beam welding of inconel-718 alloy using genetic algorithm approach

Vishnu¹,

Satheesh²,

Dhas³

et al. 2021

IJATEE

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“…[1][2][3] Hastelloy X mainly used in the manufacturing of aerospace components such as the combustion chamber, thrust reverser, tail pipes and afterburner. It provides superior corrosion performance and maintains its strength at a higher temperature of upto 1200 C. [4][5][6] Most parts of the combustion chamber need to be joined during the fabrication of aerospace engine and sometimes repairing of cracks formed on the inner surface of the combustion chamber due to the long period of running at high temperature. It would be repaired or fabricated by fusion welding techniques like gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW).…”

Section: Introductionmentioning

confidence: 99%

Prospects of pulsed current arc welding on aerospace grade Hastelloy X

Munusamy

Manikandan

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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The conventional constant current arc welding of Hastelloy X (Ni-Cr-Fe-Mo) leads to the solidification and liquation cracks in the weldment. The higher heat supplied in constant current weldment develops the secondary carbide precipitates. It promotes the development of hot cracks in the weldment. In this study, joining of Hastelloy X plates was carried out by constant current gas tungsten arc welding (GTAW) and pulsed current gas tungsten arc welding (PCGTAW) with C263 filler wire. The result discovered that no hot cracks were formed in the weldment. In constant current mode, Cr-rich and Mo-rich Cr23C6 (M23C6), Fe2MoC, Fe3Mo3C (M6C), and Cr2Ti precipitates were observed. Whereas, in pulsed current mode, Ni3(Al, Ti), Ni3Ti, Co3Ti, Cr2Ti precipitates are found due to the segregation of Co, Al, and Ti. No Cr-rich and Mo-rich carbide phases identified in pulsed current weldment due to rapid cooling rate and higher thermal gradient observed during solidification. The tensile results revealed that 8.23% increase in the ultimate tensile strength and a 29.62% increase in elongation of pulsed current mode welding compared to constant current welding. Further, the microhardness and impact toughness of PCGTAW is 3.32% and 5.45% higher than GTAW, respectively. In pulsed current welding, better mechanical properties were identified compared to constant current welding. The nonappearance of Cr and Mo-rich phases and refined microstructure in the weldment are the main reason for better strength.

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An Empirical-Statistical and Experimental Analysis of Direct Laser Metal Deposition of WC-12Co Mixed Powder on SS 304 Substrate

Singh

Bal

Pratihar

et al. 2022

Lecture Notes in Mechanical Engineering

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Optimization of Melt Zone Area for Electron Beam Welded Hastelloy C-276 Sheet and Study of Corrosion Resistance of the Optimized Melt Zone in 3.5 wt% NaCl Aqueous Solution

Cited by 18 publications

References 31 publications

Optimization of responses in electron beam welding of inconel-718 alloy using genetic algorithm approach

Optimization of responses in electron beam welding of inconel-718 alloy using genetic algorithm approach

Prospects of pulsed current arc welding on aerospace grade Hastelloy X

An Empirical-Statistical and Experimental Analysis of Direct Laser Metal Deposition of WC-12Co Mixed Powder on SS 304 Substrate

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