Segregation and Precipitation Behavior of Phosphorus in a Ni-Fe-Cr Base Wrought Superalloy

2018 ◽  
Vol 913 ◽  
pp. 150-156 ◽  
Author(s):  
Sha Zhang ◽  
An Wen Zhang ◽  
Wei Yang Wang ◽  
Xin Xin ◽  
Kai Zhang
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Grain Boundaries ◽  
Energy Dispersive Spectroscopy ◽  
Peak Temperature ◽  
Energy Dispersive ◽  
Precipitation Behavior ◽  
Temperature Range ◽  
Precipitation Temperature ◽  
Scanning Electron

The segregation and precipitation behavior of phosphoruswas studied in aNi-Fe-Cr base wroughtsuperalloy. The precipitation behavior of phosphides in the alloy contained 0.025% Pwas examined after soaking at 750-1080°C to determine the precipitation temperature range of MNP-type phosphide. The microstructuresunder these various conditions wereinvestigated by scanning electron microscope(SEM) and energy dispersive spectroscopy (EDS). The precipitation temperature of the phosphide in the alloy was determined to be in the range of 850-1040 °C and the precipitation peak temperature was around 980°C.In addition, the melting temperatureof the phosphide was determined to be between 1200 °C and 1250 °C. The current results indicate the tendency of phosphorus segregated at grain boundaries.

scholarly journals ANALISIS PENGARUH LAJU PUTAR TERHADAP KOROSI BAJA KARBON API 5LX65 MENGGUNAKAN METODE ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY

2012 ◽  
Vol 2 (1) ◽  
pp. 1
Author(s):  
Agus Solehudin ◽  
Asep Lukman
Keyword(s):  
Electron Microscope ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Scanning Electron Microscope ◽  
Energy Dispersive Spectroscopy ◽  
Electrochemical Impedance ◽  
Energy Dispersive ◽  
X Ray ◽  
Scanning Electron

Pada percobaan ini, telah dipelajari pengaruh laju putar terhadap laju korosi baja karbon API 5LX65 yang direndam selama 24 jam dalam larutan NaCl 3,5% + 500 mg/L H2S menggunakan metode EIS (Electrochemical Impedance Spectroscopy) pada suhu 50oC dan pH 4 dengan variasi laju putar 50 rpm, 150 rpm, dan 250 rpm. Hasil percobaan memperlihatkan pergeseran dan penyempitan kurva setengah lingkaran impedansi imaginer terhadap impedansi real, dengan meningkatnya laju putar dari 50 rpm sampai dengan 250 rpm. Hal ini mengindikasikan bahwa aktifitas pelarutan baja meningkat dengan percepatan laju putar. Nilai Cdl meningkat dengan meningkatnya laju putar. Nilai tahanan polarisasi (Rp) semakin menurun dengan meningkatnya laju putar, sementara nilai tahanan larutan (Rs) relatif tidak berubah. Potensial korosi pada laju putar 50 rpm, 150 rpm dan 250 rpm stabil  pada -517 mV hingga -508 mV terhadap Ag/AgCl. Gabungan pengamatan Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS) dan X-Ray Diffractomer (XRD) menunjukkan terbentuknya lapisan produk korosi. Hasil analisis XRD spesimen uji yang dikorosikan pada suhu 50oC selama 24 jam menunjukkan bahwa lapisan produk korosi mengandung besi sulfida (FeS). Morfologi permukaan spesimen ini memperlihatkan adanya korosi sumuran.Kata kunci: laju putar, korosi, baja karbon, EIS, H2S

scholarly journals Karakterisasi Membran ZSM-5 yang Disintensis dengan Variasi Jenis dan Ukuran Kasa Penyangga

2020 ◽  
Vol 16 (1) ◽  
pp. 1
Author(s):  
Ana Hidayati Mukaromah ◽  
Tulus Ariyadi ◽  
Inas Hasna Azizah ◽  
Mifbakhuddin Mifbakhuddin
Keyword(s):  
Fourier Transform ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Energy Dispersive Spectroscopy ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Aisi 316 ◽  
Scanning Electron

<p>Telah dilakukan sintesis dan karakterisasi membran ZSM-5 dengan penyangga kasa jenis 304 ukuran 200 dan 400 mesh dan jenis kasa AISI 316 ukuran 180 mesh. Tujuan penelitian ini adalah mensintesis membran ZSM-5 dengan penyangga kasa jenis 304 ukuran 200 dan 400 mesh dan jenis kasa AISI 316 ukuran 180 mesh dan mengkarakterisasi membran ZSM-5 hasil sintesis. Sintesis membran dilakukan dengan cara melapiskan prekursor ZSM-5 (<em>coating)</em> pada penyangga kasa yang telah diberi perlakuan dan dipanaskan pada suhu 90 °C selama 4 hari. Selanjutnya, membran yang dihasilkan dikarakterisasi engan metoda <em>X-ray diffraction</em> (XRD), <em>scanning electron microscope-energy dispersive spectroscopy</em> (SEM-EDS) dan <em>Fourier-transform infrared</em> (FTIR). Hasil citra SEM-EDS menunjukkan bahwa ukuran membran ZSM-5 yang semakin besar, menghasilkan jumlah lubang atau pori semakin banyak dengan luasan pori yang semakin kecil. Pola difraksi XRD menunjukkan bahwa membran yang dihasilkan mempunyai intensitas tertinggi pada 2 8º dan 23º yang merupakan karakteristik dari ZSM-5. Hasil spektra FTIR menunjukkan adanya serapan pada bilangan gelombang 450 cm<sup>-</sup><sup>1</sup>yang merupakan ciri khas membran ZSM-5.</p><p class="Text"><strong>Characterization of ZSM-5 Membranes Synthesized by Variation of Support Types and Sizes.</strong> Synthesis and characterization of ZSM-5 membrane were carried out with 304 type 200 and 400 mesh gauze supports and 180 mesh AISI 316 gauze types. The purpose of this study was to synthesize ZSM-5 membrane with 304 type 200 and 400 mesh gauze support and AISI 316 type 180 mesh size 180 mesh and characterize the synthesized ZSM-5 membrane. Membrane synthesis was carried out by coating the pre-treated gauze support with the ZSM-5 precursor and was heated at 90 °C for 4 days. Furthermore, the resulting membrane was characterized by X-ray diffraction (XRD), scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) dan Fourier-transform infrared (FTIR). The SEM-EDX analysis shows that the increasing of ZSM-5 membrane size allowed pores number to increase with smaller pore surface area. The X-ray Diffraction pattern (XRD) shows that the resulting membrane has the highest intensity at 2  of 8º and 23º as the characteristics of ZSM-5. The FTIR spectra results show absorption at wavenumbers 450 cm<sup>-1</sup> which is a characteristic of ZSM-5 membranes.</p>

scholarly journals Continuidad en la técnica de elaboración de moldes para el vaciado de plata en el área centro andina desde la época precolombina hasta la actualidad

2019 ◽  
pp. 54-61
Keyword(s):  
Electron Microscope ◽  
Technology Transfer ◽  
Scanning Electron Microscope ◽  
Energy Dispersive Spectroscopy ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Continuidad en la técnica de elaboración de moldes para el vaciado de plata en el área centro andina desde la época precolombina hasta la actualidad Continuity of the technique of manufacturing molds for casting silver at the Center Andean Area, from Precolumbian times Luisa Vetter Parodi Museo Nacional Sicán; Programa de Estudios Andinos-PUCP Av. Manuel Villarán 192, Dpto. 302, Urbanización Aurora, Miraflores DOI: https://doi.org/10.33017/RevECIPeru2011.0010/ RESUMEN En la época precolombina, los orfebres del área centro andina manejaban distintas técnicas de vaciado para elaborar piezas de metal. Una de estas técnicas era el vaciado en moldes bivalvos elaborados en arcilla y con temperantes orgánicos. Esta misma técnica de elaboración de moldes la podemos apreciar hoy en día en San Pablo de Canchis, donde los plateros cusqueños elaboran sus piezas vaciadas de plata en moldes elaborados con técnicas muy parecidas a la de los orfebres precolombinos. Para poder determinar si hubo transferencia de tecnología entre los orfebres precolombinos y los sanpablinos, hemos analizado moldes procedentes del cementerio inca de Rinconada Alta en La Molina en Lima y moldes de San Pablo de Canchis por microscopia electrónica de barrido con espectroscopia de energía dispersa (MEB-EED), fluorescencia de rayos X (FRX) y difracción de rayos X (DRX). Descriptores: Plata, moldes, vaciado, época precolombina, San Pablo de Canchis, arqueometría. ABSTRACT In Precolumbian times, silversmiths used different casting techniques to make their metal works. One of them was casting with bivalve molds made with clay and organic temper. The same technique can be seen nowadays at San Pablo de Canchis, where Cuzco silversmiths made their works with similar techniques to those of Precolumbian times. In order to determine if there was a technology transfer between Precolumbian silversmiths and San Pablo's, we have analized molds from the Inca cemetery of Rinconada Alta, La Molina, in Lima, and also molds from San Plablo de Canchis, using scanning electron microscope and energy dispersive spectroscopy (SEM-EDAX), X ray fluorescence (XRF) and X ray diffraction (XRD). Keywords: Silver, molds, casting, Precolumbian times, San Pablo de Canchis, archeometry.

Functional Vibro Pressed Pavement with Ecological Benefits

2013 ◽  
Vol 787 ◽  
pp. 328-332
Author(s):  
Petr Novosad ◽  
Jan Přikryl ◽  
Pavel Louda ◽  
Michal Holák ◽  
Jaroslav Válek ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Energy Dispersive Spectroscopy ◽  
Energy Dispersive ◽  
Functional Tests ◽  
Ecological Benefits ◽  
Catalytic Materials ◽  
Scanning Electron

The paper describes results of functional tests of photo catalytic materials directly in matrix of prefabricated vibro pressed pavement blocks. Resulting surfaces of photo catalytic concrete products were tested with respect to conversion of NOx and surface was analyzed with Scanning Electron Microscope (SEM), so called element maps were elaborated by means of Energy Dispersive Spectroscopy (EDS).

The microstructural location of impurities in ice

2003 ◽  
Vol 81 (1-2) ◽  
pp. 1-9 ◽  
Author(s):  
I Baker ◽  
D Cullen ◽  
D Iliescu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Grain Boundaries ◽  
Energy Dispersive ◽  
River Ice ◽  
X Ray ◽  
Vostok Station ◽  
Accretion Ice ◽  
Scanning Electron

The microstructural locations of impurities in natural ice have been of interest for over a century, but only in recent years have efforts been made to determine their location. Here, we outline the few measurements that have been performed. The focus is on a technique that we developed, which has also been subsequently used by others, that involves the controlled sublimation of uncoated ice in a low-vacuum scanning electron microscope. This process leaves behind concentrated impurities, in both the grain boundaries and the grain interiors, which are then identified using energy dispersive X-ray microanalysis. An overview of observations on meteoric ice from both Greenland and Antarctica; on accretion ice from Vostok Station, Antarctica; and on temperate pond and river ice is presented. PACS No.: 61.72-y

Using Metallography,Scanning Electron Microscope and Energy Dispersive Spectroscopy Techniques to enhance failure analysis on aerospace componets

2006 ◽  
Vol 12 (S02) ◽  
pp. 196-197
Author(s):  
WE Heady
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Failure Analysis ◽  
Energy Dispersive Spectroscopy ◽  
Energy Dispersive ◽  
Scanning Electron

Extended abstract of a paper presented at Microscopy and Microanalysis 2006 in Chicago, Illinois, USA, July 30 – August 3, 2005

PHAX-SCAN: Functional integration of a Scanning Electron Microscope and an energy-dispersive x-ray analyser

1989 ◽  
Vol 47 ◽  
pp. 56-57
Author(s):  
Marc H. Peeters ◽  
Max T. Otten
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
Functional Integration ◽  
Energy Dispersive ◽  
X Rays ◽  
X Ray ◽  
High Speed Analysis ◽  
Scanning Electron

Over the past decades, the combination of energy-dispersive analysis of X-rays and scanning electron microscopy has proved to be a powerful tool for fast and reliable elemental characterization of a large variety of specimens. The technique has evolved rapidly from a purely qualitative characterization method to a reliable quantitative way of analysis. In the last 5 years, an increasing need for automation is observed, whereby energy-dispersive analysers control the beam and stage movement of the scanning electron microscope in order to collect digital X-ray images and perform unattended point analysis over multiple locations.The Philips High-speed Analysis of X-rays system (PHAX-Scan) makes use of the high performance dual-processor structure of the EDAX PV9900 analyser and the databus structure of the Philips series 500 scanning electron microscope to provide a highly automated, user-friendly and extremely fast microanalysis system. The software that runs on the hardware described above was specifically designed to provide the ultimate attainable speed on the system.

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