scholarly journals Enhancement of the Localization Effect during Electrochemical Machining of Inconel 718 by Using an Alkaline Solution

2019 ◽  
Vol 9 (4) ◽  
pp. 690 ◽  
Author(s):  
Dengyong Wang ◽  
Bin He ◽  
Wenjian Cao
Keyword(s):  
Alkaline Solution ◽  
Inconel 718 ◽  
Electrochemical Machining ◽  
Cost Effective ◽  
Machining Accuracy ◽  
Mixed Solution ◽  
Inconel 718 Alloy ◽  
Machined Surface ◽  
Localization Effect ◽  
Cost Effective Method

Electrochemical machining (ECM) is a cost-effective method for the machining of difficult-to-cut Inconel 718 superalloy. However, the machining accuracy of ECM is still limited by the poor localization effect due to the existence of stray corrosion. In this paper, a mixed solution of neutral NaNO3 and alkaline NaOH is used to improve the localization effect during ECM of Inconel 718. The potentiodynamic polarization curves and current efficiencies for metal dissolution are measured, and the micro morphologies are examined. The results show that the use of an alkaline solution can promote the formation of a compact passive film on the surface of Inconel 718. ECM tests with cylindrical electrodes are specially designed to verify the effect of alkaline solution on the localization of anodic dissolution. The experimental results indicated that the stray corrosion of the non-machined surface of Inconel 718 alloy can be effectively eliminated by using a mixed solution of NaNO3 and NaOH. The surface roughness of the non-machined area can be noticeably improved.

Electrochemical Machining Properties of the Laser Rapid Formed Inconel 718 Alloy in NaNO3Solution

2017 ◽  
Vol 164 (14) ◽  
pp. E548-E559 ◽  
Author(s):  
Xindi Wang ◽  
Ningsong Qu ◽  
Pengfei Guo ◽  
Xiaolong Fang ◽  
Xin Lin
Keyword(s):  
Inconel 718 ◽  
Electrochemical Machining ◽  
Inconel 718 Alloy ◽  
Machining Properties

scholarly journals Anomalies in the Geometric Surface Structure of Shaped Elements Composed of Inconel 718 Alloy

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7524
Author(s):  
Bartłomiej Krawczyk ◽  
Piotr Szablewski ◽  
Stanisław Legutko ◽  
Krzysztof Smak ◽  
Bartosz Gapiński
Keyword(s):  
Inconel 718 ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Cutting Edge ◽  
Depth Of Cut ◽  
Roughness Parameters ◽  
Inconel 718 Alloy ◽  
Machined Surface ◽  
Dry And Wet Conditions ◽  
Geometric Surface

This paper presents the results of investigation that was performed on shafts composed of Inconel 718. Tests were performed in dry and wet conditions. Cutting parameters, such as feed and depth of cut, were constant. The cutting speed was changed. The investigation was performed for various shaft shapes: cylindrical, taper 30°, taper 45°, and sphere. For that reason, the value of the angle between the machined surface and the cutting edge changed. The lowest values of the roughness parameters, Ra and Rz, were obtained for a larger value of the angle between the machined surface and cutting edge. The investigation showed that cutting speed, machining conditions (dry and wet machining), and the variable angle between the machined surface and the cutting edge influenced the surface roughness. Application of a higher cutting speed resulted in lower roughness values. Lower values of roughness parameters were obtained by wet machining.

Evaluation of Surface Quality during Electrical Discharge Machining of Inconel 718 with Powder Metallurgy Electrodes

2011 ◽  
Vol 410 ◽  
pp. 245-248 ◽  
Author(s):  
Naveen Beri ◽  
S. Maheshwari ◽  
C. Sharma
Keyword(s):  
Powder Metallurgy ◽  
Surface Quality ◽  
Inconel 718 ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Evaluation Criteria ◽  
Inconel 718 Alloy ◽  
Machined Surface ◽  
Energy Dispersion Spectrum ◽  
Pulse On Time

In recent years, researchers have reported powder metallurgy processed electrodes as alternative tooling for electrical discharge machining (EDM). The present experimental study evaluates the quality of machined surface during electrical discharge machining (EDM) of Inconel 718 alloy steel with powder metallurgy (PM) processed electrodes. The investigated process parameters were polarity, electrode type, peek current, pulse on time, duty cycle, gap voltage, retract distance and flushing pressure. The surface quality was measured in terms of surface roughness (Ra). An orthogonal array L36 (21X 37) based on Taguchi methodology was applied to plan and design experiments. Experimental data was statistically analyzed using analysis of variance (ANOVA) and optimum condition was achieved for evaluation criteria. It was concluded that polarity, electrode type, peek current, have significant effect on surface quality and minimum Ra is obtained with CuW2080 electrode at minimum current and negative polarity. Deposition of tungsten with CuW2080 (80%W 20%Cu) electrode was confirmed by energy dispersion spectrum (EDS) of the machined surface.

scholarly journals Analysis of control factors and surface integrity during wire-EDM of Inconel 718 alloy using T-GRA approach

2021 ◽  
Vol 9 (2) ◽  
pp. 294-312
Author(s):  
Md Ehsan Asgar ◽  
Ajay Kumar Singh Singholi
Keyword(s):  
Inconel 718 ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Pulse Interval ◽  
Inconel 718 Alloy ◽  
Machined Surface ◽  
Sem Images ◽  
Control Factors ◽  
Controllable Factors ◽  
Four Levels

In today’s competitive modern manufacturing sectors, there is a vital need of utter precision and rigorous processing using various manufacturing approaches that directly influences the cost and processing duration of mechanized materials in addition to the consistency of the finished products. Therefore, it’s essential to figure out the required output by adjusting the control factors of any machining techniques which resulted in optimal values of the desired outcome. In this study, machining evaluation and process optimization is carried out on volumetric extraction of material namely material removal rate (MRR), kerf obtained during the machining (KW) and surface roughness (SR) of Inconel 718 superalloy during CNC controlled wire- electrical discharge machining. Four controllable factors- pulse interval, wire speed, pulse duration and peak current are considered to investigate the influence on performance measures. Taguchi's L16 has been used to construct the set of experiments before physical experimental runs and most influencing factors have been evaluated using ANOVA. SEM images and EDXS analysis have been resorted to examine the morphology of Inconel 718. These findings assist in identifying the topography of the machined surface. Further, the optimum integration has been obtained for the best yield and recorded using grey relational analysis integrated with Taguchi’s technique (T-GRA). The unfamiliarity of the work is based on consideration of zinc coated thin wire electrode and Taguchi-Grey combined approach of modelling with four levels of experimental design.

CAD Of Anticorrosive Protection Of Steel Structures

2019 ◽  
pp. 18-23
Keyword(s):  
Protective Coating ◽  
Computer Aided Design ◽  
Steel Structures ◽  
Cost Effective ◽  
Operating Conditions ◽  
Computational Tool ◽  
Protection Method ◽  
Cost Effective Method ◽  
The Cost ◽  
Aided Design

The choice of cost-effective method of anticorrosive protection of steel structures is an urgent and time consuming task, considering the significant number of protection ways, differing from each other in the complex of technological, physical, chemical and economic characteristics. To reduce the complexity of solving this problem, the author proposes a computational tool that can be considered as a subsystem of computer-aided design and used at the stage of variant and detailed design of steel structures. As a criterion of the effectiveness of the anti-corrosion protection method, the cost of the protective coating during the service life is accepted. The analysis of existing methods of steel protection against corrosion is performed, the possibility of their use for the protection of the most common steel structures is established, as well as the estimated period of effective operation of the coating. The developed computational tool makes it possible to choose the best method of protection of steel structures against corrosion, taking into account the operating conditions of the protected structure and the possibility of using a protective coating.

Monitoring effluent quality in hypertrophic wastewater reservoirs using remote sensing

1996 ◽  
Vol 33 (8) ◽  
pp. 23-29 ◽  
Author(s):  
I. Dor ◽  
N. Ben-Yosef
Keyword(s):  
Water Quality ◽  
Theoretical Model ◽  
Principal Component ◽  
Cost Effective ◽  
Operational Parameters ◽  
Effluent Quality ◽  
Optical Images ◽  
Routine Monitoring ◽  
Cost Effective Method ◽  
Wastewater Quality

About one hundred and fifty wastewater reservoirs store effluents for irrigation in Israel. Effluent qualities differ according to the inflowing wastewater quality, the degree of pretreatment and the operational parameters. Certain aspects of water quality like concentration of organic matter, suspended solids and chlorophyll are significantly correlated with the water column transparency and colour. Accordingly optical images of the reservoirs obtained from the SPOT satellite demonstrate pronounced differences correlated with the water quality. The analysis of satellite multispectral images is based on a theoretical model. The model calculates, using the radiation transfer equation, the volume reflectance of the water body. Satellite images of 99 reservoirs were analyzed in the chromacity space in order to classify them according to water quality. Principal Component Analysis backed by the theoretical model increases the method sensitivity. Further elaboration of this approach will lead to the establishment of a time and cost effective method for the routine monitoring of these hypertrophic wastewater reservoirs.

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