scholarly journals Experimental research on the counter-rotating electrochemical machining of 304 stainless steel and Inconel 718 alloy

2019 ◽  
pp. 9741-9754
Author(s):  
Dengyong Wang ◽  
Keyword(s):  
Stainless Steel ◽  
Experimental Research ◽  
Inconel 718 ◽  
Electrochemical Machining ◽  
304 Stainless Steel ◽  
Inconel 718 Alloy

Effects of Activating Flux on Inconel 718 Alloy and AISI 304 Stainless Steel Dissimilar TIG Welds

2012 ◽  
Vol 626 ◽  
pp. 518-522
Author(s):  
Hsuan Liang Lin ◽  
Zhau Hong Hsu ◽  
Wun Kai Wang
Keyword(s):  
Stainless Steel ◽  
Inconel 718 ◽  
Welding Process ◽  
304 Stainless Steel ◽  
Angular Distortion ◽  
Aisi 304 Stainless Steel ◽  
Inconel 718 Alloy ◽  
Aisi 304 ◽  
Activating Flux ◽  
Dissimilar Welds

The purpose of this work is to investigate the effects of activating flux on the penetration, depth-to-width ratio (DWR), angular distortion and hardness of Inconel 718 alloy and AISI 304 stainless steel (SS) dissimilar welds in the tungsten inert gas (TIG) welding process. In the activated TIG (A-TIG) process, the single component fluxes such as SiO2, NiO, MoO3 and MoS2 and the mixed component fluxes that using 50 % of each single component flux to create six new mixtures were used in the experiment. The experimental results showed that the A-TIG welds coated with 100% SiO2 flux was provided with best DWR of dissimilar welds. In addition, the experimental procedure of A-TIG welding process not only produced a significant increase in penetration and DWR of weld bead, but also improved the angular distortion and hardness of Inconel 718 alloy and AISI 304 SS dissimilar welds.

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.

Technology of Electrochemical Micromachining Based on Surface Modification by Fiber Laser on Stainless Steel

2017 ◽  
Vol 909 ◽  
pp. 67-72
Author(s):  
Xiao Hai Li ◽  
Shu Ming Wang ◽  
Bei Bei Xue
Keyword(s):  
Stainless Steel ◽  
Surface Modification ◽  
Fiber Laser ◽  
Laser Scanning ◽  
Complex Structure ◽  
Electrochemical Machining ◽  
304 Stainless Steel ◽  
Electrochemical Micromachining ◽  
Micro Machining ◽  
Micro Cavity

In order to fabricate the micro cavity with complex structure on stainless steel, the technology of micro electrochemical machining based on surface modification by fiber laser is adopted. Heating scan on the surface of 304 stainless steel by using fiber laser can realize marking. In the process of laser heating and metal melting on the surface of 304 stainless steel, oxide layer can be formed and phase transformation can also occur, and the corrosion resistance layer with predefined pattern is formed. In the next process of micro electrochemical machining, the laser masking layer severs as the protective layer to realize micro machining of micro cavity. A newly developed device of electrochemical micro machining based on surface modification by fiber laser can meet the micro machining requirement. After laser masking processing through laser scanning on the surface of the 304 stainless steel, the passivation electrolyte and high-frequence-pulse electrochemical machining power supply were adopted, and the samples with typical structures by using electrochemical micromachining with fiber laser masking were fabricated.

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

Research on NC Electrochemical Mechanical Drilling

2012 ◽  
Vol 271-272 ◽  
pp. 476-482
Author(s):  
Wei Min Gan ◽  
Bo Xu ◽  
Zhi Fang Zhao
Keyword(s):  
Stainless Steel ◽  
Electrochemical Machining ◽  
304 Stainless Steel ◽  
High Temperature Alloy ◽  
Mechanical Grinding ◽  
High Quality ◽  
Taper Angle ◽  
Composite Cathodes ◽  
High Efficient ◽  
Drilling Method

NC electrochemical mechanical drilling was based on NC, Electrochemical machining and mechanical grinding. It drilled with different diameter composite cathodes. This kind of drilling method took the advantages of electrochemical mechanical, so it was not restricted by parts’ strength, hardness and stiffness. The cover of cathode ensured the drilling precision. So this technology should be studied. This paper took 304 stainless steel and high temperature alloy GH710 to do study, at last the reasonable and high efficient process parameters were found in the experiment. The high quality holes of better roundness and small taper angle were drilled. The results showed that the study of NC electrochemical mechanical drilling difficult-to-machine materials was very meaningful.

Preparation of cell adhesive micropores by one-step potentiostatic polarization on 304 stainless steel

2018 ◽  
Vol 233 (8) ◽  
pp. 1914-1919 ◽  
Author(s):  
Yu Li ◽  
Lei Guan ◽  
Hongyu Wei ◽  
Zhongning Guo ◽  
Guan Wang
Keyword(s):  
Stainless Steel ◽  
Cell Density ◽  
Electrochemical Machining ◽  
304 Stainless Steel ◽  
Machining Accuracy ◽  
Machining Parameters ◽  
Machining Time ◽  
Cell Adhesive ◽  
One Step ◽  
Potentiostatic Polarization

Non-conventional electrochemical machining in micro-manufacturing has atomic-scale machining accuracy only in theory. By taking full advantage of the material heterogeneity, the micropores which most easily initiate at the surface stoichiometric inhomogeneities for stainless steel can be prospectively obtained with the size kept under control by adjusting the machining parameters. Taking the economy and efficiency into account, a one-step potentiostatic polarization method was established. Optimization of the machining parameters for achievement of microporous structure required by cell adhesive surface on 304 stainless steel in natural 15 wt% NaNO3 solution was confirmed. Based on the potentiodynamic polarization curve, a DC voltage of 5 V in the region of secondary passivation was selected due to the porous secondary passivation film which results in the initiation of large amounts of pores. The effects of the machining time on the pore size, coverage ratio, density, unevenness degree and adhesive cell density on the porous surface were investigated through statistical analysis. The results show that there is a maximum value of machining time, tm, when the surface has a maximum pore density, and minimum pore unevenness degree. Meanwhile, adhesive cell density increases to significant level at tm then levels off over time. Therefore, this approach has been testified possible through the novel use of material microdefects and electrochemical machining to obtain cell adhesive micropores.

Experimental Research on Fiber Laser Underwater Cutting of 1 mm Thick 304 Stainless Steel

2016 ◽  
Vol 43 (6) ◽  
pp. 0602001
Author(s):  
李倩 Li Qian ◽  
孙桂芳 Sun Guifang ◽  
卢轶 Lu Yi ◽  
张永康 Zhang Yongkang
Keyword(s):  
Stainless Steel ◽  
Fiber Laser ◽  
Experimental Research ◽  
304 Stainless Steel ◽  
Underwater Cutting

scholarly journals Theoretical And Experimental Research On 3D Ultrasonic Vibration-Assisted Turning Driven By a Single Actuator

2021 ◽  
Author(s):  
Shiyu Wei ◽  
Ping Zou ◽  
Jiahao Zhang ◽  
Jingwei Duan ◽  
Rui Fang
Keyword(s):  
Stainless Steel ◽  
Theoretical Analysis ◽  
Ultrasonic Vibration ◽  
Experimental Research ◽  
Three Dimensional ◽  
304 Stainless Steel ◽  
Machined Surface ◽  
Theory And Experiment ◽  
Dimensional Surface

Abstract In this paper, the peak heights of several turning methods were analyzed theoretically. Based on the results of theoretical analysis, a 3D-UVAT device driven by a single actuator was developed. To validate this design, the theory and experiment of 3D-UVAT have been undertaken. The FEA results show that design is safe, and can achieve obvious displacements in X-axis, Y-axis, and Z-axis. In the experiment, 304 stainless steel was chosen as experimental material. For comparison, CT, UVAT, and UEVT experiments were also carried out. The experimental results show that with the help of ultrasonic vibration, the surface grooves and defects are significantly reduced. This phenomenon is more obvious on machined surface obtained by 3D-UVAT. Three-dimensional surface topography shows that the roughness value Sa obtained by 3D-UVAT is smaller than CT and UVAT. Under some cutting conditions, the roughness value Sa of machined surface obtained by 3D-UVAT is smaller than UEVT. Thus, the results of theory and experiment proved that the 3D ultrasonic vibration-assisted turning driven by a single actuator has a great potential in improving the quality of machined surface.

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