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Multi-Response Optimization of Electrical Discharge Machining of 17-4 PH SS Using Taguchi-Based Grey Relational Analysis

Gerçekcioğlu Eyyup, Albaşkara Mehmed

Archives of Metallurgy and Materials

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2023

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Vol. 68, iss. 3

861--868

EN

Multiple response optimization of the machining of 17-4 PH stainless steel material, which is difficult to process with traditional methods, with EDM was made by Taguchi-based grey relational analysis method. Surface roughness (Ra), material removal rate (MRR), and electrode wear rate (EWR) were the responses, while current, pulse-on time, pulse-off time, and voltage were chosen as process parameters. According to the multi-response optimization, the experiment level that gave the best result was A1B2C2D2. optimum machining outputs were found as A1B3C1D1 using the Taguchi method. As a result of the Taguchi analysis and ANOVA, it was determined that the significant parameters according to multiple performance characteristics were current (56.22%) and voltage (22.40%). The surfaces of the best GRG and optimal sample were examined with XRD, SEM and EDX analysis and the effects on the surfaces were compared.

2

Surface Characterization of Metallic Fuel Slugs Prepared by Modified Injection Casting

Mun S.-U., Kim K.-H., Oh S.-J., Park J.-Y., Hong S.-I.

Archives of Metallurgy and Materials

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2018

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Vol. 63, iss. 2

1049--1053

EN

Metallic fuel slugs containing rare-earth (RE) elements have high reactivity with quartz (SiO2) molds, and a reaction layer with a considerable thickness is formed at the surface of metallic fuel slugs. The surface characterization of metallic fuel slugs is essential for safety while operating a fast reactor at elevated temperature. Hence, it is necessary to evaluate the surface characteristics of the fuel slugs so that chemical interaction between fuel slug and cladding can be minimized in the reactor. When the Si element causes a eutectic reaction with the cladding, it deteriorates the metallic fuel slugs. Thus, it is necessary to examine the characteristics of the surface reaction layer to prevent the reaction of the metallic fuel slugs. In this study, we investigated the metallurgical characteristics of the surface reaction layer of fabricated U-10wt.%Zr-Xwt.%RE (X = 0, 5, 10) fuel slugs using injection casting. The results showed that the thickness of the surface reaction layer increased as the RE content of the metallic fuel slugs increased. The surface reaction layer of the metallic fuel slug was mainly formed by RE, Zr and the Si, which diffused in the quartz mold.

3

Application of nuclear techniques for characterization of materials surfaces : own investigations examples

Sartowska B., Piekoszewski J., Waliś L., Starosta W., Barlak M., Nowicki L., Ratajczak R.

Nukleonika

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2012

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Vol. 57, No. 4

521-528

EN

Different methods and techniques for material characterization are often used as a standard procedure for the determination of material properties. Nuclear techniques provide new and more detailed information about the investigated materials. The main goal of the carried out experiments was to improve surface properties including wear, corrosion and high temperature oxidation resistance. Modification processes were carried out using high intensity pulsed plasma beams - HIPPB (106-108 W.cm-2) generated in a rod plasma injector (RPI). In most solid materials such treatment leads to a fast transient melting of the surface layer of the substrate followed by rapid crystallization. Heating and cooling processes are of non-equilibrium type. Initial and modified materials were characterized using different investigation methods including nuclear techniques. Results of the used nuclear techniques such as nuclear reaction analysis (NRA), Rutherford backscattered spectroscopy (RBS) and conversion electron Mössbauer spectroscopy (CEMS) are presented in the paper.

4

Auger Electron Spectroscopy for Materials Science: Examples of Applications

Pisarek M., Łukaszewski M., Janik-Czachor M.

Polish Journal of Chemistry

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2009

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Vol. 83, nr 8

1393-1412

EN

This paper summarizes the results of the investigations on selected topics from the field of materials science, such as: composition and stability of the passive films on metal alloys and the effect of electrochemical and chemical modifications on the catalytic activity and selectivity of Cu-based amorphous alloys as well as of Raney Ni catalysts doped with Cr. Microscopic and surface analytical techniques like scanning electron microscopy (SEM) and Auger electron spectroscopy (AES) provide an in sight into the mechanism of the functionalization of the materials studied. The local chemical and morphological inhomogeneities at a micro- and nano-scale have been monitored. An attempt has been made to find an interrelation between the composition, structure and morphology of materials and their specific behavior in the processes considered.

5

Surface characterization of palladium catalysts using time-of-flight secondary ion mass spectrometry (ToF-SIMS)

Grams J., Góralski J., Szczepaniak B., Paryjczak T.

Polish Journal of Chemical Technology

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2006

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Vol. 8, nr 2

106-108

EN

This paper presents potentialities of time-of-flight secondary ion mass spectrometry in surface characterization of palladium catalysts destined for hydrodechlorination reaction. The secondary ion mass spectra collected from the surface of the analyzed catalysts allowed to obtain useful information regarding surface composition, presence of contaminants and interactions between particular surface components. Moreover, the amount of Cl containing species formed on the catalyst surface during hydrodechlorination reaction was also estimated.

6

Sorbents for Trapping Organic Pollutants From Air

Ligor T., Górecka H., Buszewski B.

International Journal of Occupational Safety and Ergonomics

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1998

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Vol. 4, No. 2

153--167

EN

A series of siliceous adsorbents with chemically bonded phases (CBPs) of different polarity were tested as sorbents for trapping air pollutants (petroleum ether) using controlled setup. Moreover, special attention was paid to the potential role of metal impurities as strong adsorption sites. Sorbents were characterized by various physico-chemical methods, such as porosimetry, inductively coupled plasma (ICP) analysis, elemental analysis, derivatography, and gas hromatography. Trapping tubes were utilized for sorption of toxic pollutants from indoor air: