Effect of Heat Input on Mechanical and Electrochemical Properties of Electron-Beam-Welded Inconel 718

Sharma, Shakti; Biswas, Koushik; Majumdar, Jyotsna Dutta

doi:10.1007/s11665-020-04660-w

Cited by 16 publications

(8 citation statements)

References 21 publications

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“…Wang et al (2021) significantly minimized the precipitation of Laves phase in TIG welds of Inconel 718 and obtained 92% of base metal strength using ultrasonic pulsation of current at 80 kHz. Sharma et al (2020) observed 69.72% and 32% of base metal strength and elongation in EBW Inconel 718 joints at optimum level of heat input. Lin et al (2021 ) joined 0.2 mm thick foils of Inconel 718 using pulsed laser beam welding (P-LBW) and found hot cracking during weld metal solidification.…”

Section: Introductionmentioning

confidence: 83%

Optimization of CA-TIG welding parameters to predict and maximize tensile properties of super alloy 718 sheets for gas turbine applications

Sonar

Balasubramanian

Malarvizhi

et al. 2022

AEAT

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Purpose The primary objective of this investigation is to optimize the constricted arc tungsten inert gas (CA-TIG) welding parameters specifically welding current (WC), arc constriction current (ACC), ACC frequency (ACCF) and CA traverse speed to maximize the tensile properties of thin Inconel 718 sheets (2 mm thick) using a statistical technique of response surface methodology and desirability function for gas turbine engine applications. Design/methodology/approach The four factor – five level central composite design (4 × 5 – CCD) matrix pertaining to the minimum number of experiments was chosen in this investigation for designing the experimental matrix. The techniques of numerical and graphical optimization were used to find the optimal conditions of CA-TIG welding parameters. Findings The thin sheets of Inconel 718 (2 mm thick) can be welded successfully using CA-TIG welding process without any defects. The joints welded using optimized conditions of CA-TIG welding parameters showed maximum of 99.20%, 94.45% and 73.5% of base metal tensile strength, yield strength and elongation. Originality/value The joints made using optimized CA-TIG welding parameters disclosed 99.20% joint efficiency which is comparatively 20%–30% superior than conventional TIG welding process and comparable to costly electron beam welding and laser beam welding processes. The parametric mathematical equations were designed to predict the tensile properties of Inconel 718 joints accurately with a confidence level of 95% and less than 4.5% error. The mathematical relationships were also developed to predict the tensile properties of joints from the grain size (secondary dendritic arm spacing-SDAS) of fusion zone microstructure.

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Section: Introductionmentioning

confidence: 83%

Optimization of CA-TIG welding parameters to predict and maximize tensile properties of super alloy 718 sheets for gas turbine applications

Sonar

Balasubramanian

Malarvizhi

et al. 2022

AEAT

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“…11 In recent decades, many scholars are devoted to obtaining GH4169 welded joints without macroscopic defects and well metallurgical bonding. 10,[12][13][14][15] In fact, previous studies have attempted to improve the mechanical properties of EBW joints by weakening the weld texture. On the one hand, researchers improve the bonding strength of welding by optimizing the welding process.…”

Section: Introductionmentioning

confidence: 99%

“…19 In addition, optimizing the heat input during EBW can improve the microstructure of the welded joint. 12 On the other hand, the microstructure and mechanical properties of the weld can be improved by post-weld heat treatment technology. 20,21 Heat treatment of Inconel 718 EBW joints at 760 C resulted in the formation of complex precipitates along the interdendritic regions in the fusion zone, which can increase the hardness of the joints.…”

Section: Introductionmentioning

confidence: 99%

Effect of texture evolution and defect on the crack initiation of a Ni‐based superalloy electron beam welded joint

Wen,

Liu,

Jiang

et al. 2023

Fatigue Fract Eng Mat Struct

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Electron beam welding (EBW), a high‐quality and precise joining process, is widely used in aerospace manufacturing. In this study, through in situ scanning electron microscope (SEM) fatigue experiments and X‐ray computed tomography (CT) scanning technology, we revealed the fatigue crack initiation and propagation mechanism in GH4169 superalloy EBW joints under different post‐welding heat treatment conditions. The welded pores have a decisive effect on the fatigue properties of direct aging treatment welded joints. Fatigue cracks initiate from pore defects on the surface or in the subsurface. Due to the heterogeneous microstructure in weld seam, fatigue cracks tend to grow along the primary dendrite axis and secondary dendrite arms. Besides, in homogenization and aging treatment specimen, intergranular fatigue cracks tend to nucleate in the slip zone of large grains and twin boundaries. Although homogenization treatment can eliminate segregation, it also results in significant grain growth in both weld seam and base material.

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“…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.…”

mentioning

confidence: 99%

“…Previous literature study [1][2][3][4][5][6] states that Design of Experiments (DOE) is helpful tool to optimize welding processes but this method affects the weld quality. So this research work is planned to conduct using RSM tool to model and conduct the experiments to predict the strength of welding material with bead width and depth of penetration.…”

mentioning

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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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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Effect of Heat Input on Mechanical and Electrochemical Properties of Electron-Beam-Welded Inconel 718

Cited by 16 publications

References 21 publications

Optimization of CA-TIG welding parameters to predict and maximize tensile properties of super alloy 718 sheets for gas turbine applications

Optimization of CA-TIG welding parameters to predict and maximize tensile properties of super alloy 718 sheets for gas turbine applications

Effect of texture evolution and defect on the crack initiation of a Ni‐based superalloy electron beam welded joint

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

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