scholarly journals Effect of Cerium on the Microstructure and Inclusion Evolution of C-Mn Cryogenic Vessel Steels

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5262
Author(s):  
Liping Wu ◽  
Jianguo Zhi ◽  
Jiangshan Zhang ◽  
Bo Zhao ◽  
Qing Liu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Heterogeneous Nucleation ◽  
Energy Dispersive Spectrometer ◽  
Energy Dispersive ◽  
Vessel Steel ◽  
Cryogenic Vessel ◽  
Central Segregation ◽  
Scanning Electron

The effects of Cerium (Ce) were studied on the casting slab quality, microstructure, and inclusion evolution of cryogenic vessel steel. An optical metallographic microscope, scanning electron microscope, energy dispersive spectrometer, and Thermo-calc thermodynamic software were used for characterization and analysis. The results indicated that the central segregation was significantly improved after adding Ce and reached the lowest level when the content of Ce was 0.0009 wt.%. Meanwhile, the presence of Ce reduces the size of ferrite and improves pearlite morphology. Ce also enables the modification of Al2O3 and MnS + Ti4C2S2 inclusions into ellipsoid CeAlO3 and spherical Ce2O2S + Ti4C2S2 composite inclusions, respectively, which are easier to remove. The formed Ce2O2S inclusions are fine and can work as heterogeneous nucleation points to refine the microstructure of steel.

scholarly journals Calorimetric study on Bi-Cu-Sn alloys

2019 ◽  
Vol 38 (2019) ◽  
pp. 541-546
Author(s):  
Jolanta Romanowska
Keyword(s):  
Differential Scanning Calorimetry ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Temperature Interval ◽  
Energy Dispersive Spectrometer ◽  
Energy Dispersive ◽  
Calorimetric Study ◽  
Calorimetric Investigation ◽  
Scanning Calorimetry ◽  
Scanning Electron

AbstractThe paper presents results of calorimetric investigation of the Bi-Cu-Sn system by means of differential scanning calorimetry (DSC) at the temperature interval 25-1250∘C, Values of liquidus, solidus and invariant reactions temperatures, as well as melting enthalpies of the selected alloys were determined. Microstructure investigation of the alloys were performed by the use of a scanning electron microscope (SEM) equipped with an energy-dispersive spectrometer (EDS).

Analysis on Bursting of Rupture Disc Made by Inconel 600 Alloy

2019 ◽  
Vol 795 ◽  
pp. 290-295
Author(s):  
Jian Qun Tang ◽  
Lu Yang Geng ◽  
Jian Ming Gong
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Fatigue Fracture ◽  
Energy Dispersive Spectrometer ◽  
Energy Dispersive ◽  
Chemical Compositions ◽  
Inconel 600 ◽  
Rupture Disc ◽  
Inconel 600 Alloy ◽  
Scanning Electron

One conventional domed slotted rupture disc, which was fabricated with Inconel 600 alloy, was used in reaction kettle. It was burst after only 2000 times of operational circles. The burst causes were investigated. Morphologies of the fracture were observed by scanning electron microscope and the relatively chemical compositions were analyzed by energy dispersive spectrometer. Meanwhile, metallographic microstructures were also observed and analyzed for the material of the failure of the rupture disc. The results show that the bursting of the rupture disc was caused by fatigue fracture.

Research on Pinholes in Aluminum Foil

2014 ◽  
Vol 884-885 ◽  
pp. 308-311
Author(s):  
Qing Wei Dai ◽  
Ding Fei Zhang ◽  
Xi Chen ◽  
Jing Ren Dong ◽  
Fu Sheng Pan
Keyword(s):  
Heat Treatment ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Optical Microscopy ◽  
Energy Dispersive Spectrometer ◽  
Aluminum Foil ◽  
Energy Dispersive ◽  
Treatment Processes ◽  
Scanning Electron

To investigate pinholes in 8079 Aluminum foil, optical microscopy and scanning electron microscope with energy dispersive spectrometer were adopted. Results show that four types of pinholes in 8079 aluminum foil, (1) small size, rod-shaped, (2) pinhole in groove, (3) hole with big size, (4) crumpled pinholes. Big compounds along with all rolling and heat treatment processes cause the small rod-shaped pinhole. The big compound contains elements of Al-Fe-O.

scholarly journals Identification and Determination of Metal Elements of Dates Syrup Extracted from Various Varieties Using SEM-EDS Technique

2019 ◽  
Vol 32 (2) ◽  
pp. 126-134
Author(s):  
Mohammad K. Al Hilfi ◽  
Dhia F. Al-Fekaiki ◽  
Asaad R. Al-Hilphy
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Energy Dispersive Spectrometer ◽  
Mineral Elements ◽  
Energy Dispersive ◽  
Hydraulic Pressure ◽  
Metal Elements ◽  
Date Syrup ◽  
Scanning Electron

This study has been conducted to determine and identify the metal elements of dates syrup extracted from Khstawy, Zehdy and Shukary using Scanning electron microscope-Energy dispersive Spectrometer (SEM-EDS) technique. The results showed that dates syrup was rich in both metal and non- metals elements. The obtained results showed some different trends in the date syrup content of mineral elements. The results showed the availability of Carbon (C) element in dates syrup extracted via hydraulic pressure from Khstawy (80.73%), Zehdy (65.28 %) and Shukary (68.49%) varieties while in dates syrup produced thermally (80.59%) and dates syrup produced without thermal (72.16%). Oxygen (O) ratio in Khstawy, Zehdy, Shukary, dates syrup produced thermally, and dates syrup produced without thermal were 18.92, 35.27, 15.26, 19.09 and 27.46 respectively. Moreover, the results showed the availability of sodium (Na) (0.17 %), sulphur (S) (0.11 %), potassium (K) (0.05%), silicon (Si) (0.03%) in the dates syrup extracted from Khstawy, while in Zehdy variety there was Aluminum (Al) (0.33%), potassium (K) (0.08%), chloride (Cl) (0.03%), magnesium (Mg) (0.01%). In Shukary variety, Al (5.24%), K (0.05%), nitrogen (N) (10.73%), (S) (0.06%), copper (Cu) (0.18%). Additionally, the results showed that the quantity of metal elements available in dates syrup produced thermally were found as follow as follows: Na (0.22%), S (0.1%) as well as O and C. Yet, the number of the metal elements in the dates syrup produced by hydraulic pressure was more that the dates syrup produced thermally are as follows: Na (0.1%), Al (0.1%), K (0.1%), S (0.02%), Si (0.03%) and phosphor (P) (0.02%).

Techniques for microdrop analysis of fluids (sweat, saliva, urine) with an energy-dispersive X-ray spectrometer on a scanning electron microscope

1978 ◽  
Vol 234 (3) ◽  
pp. F255-F259
Author(s):  
P. M. Quinton
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Quantitative Methods ◽  
Energy Dispersive Spectrometer ◽  
Energy Dispersive ◽  
X Ray ◽  
Low Concentrations ◽  
Biological Interest ◽  
Wide Range ◽  
Scanning Electron

Volumes of 10(-10) liter of sweat, saliva, and urine were analyzed with an energy-dispersive spectrometer (EDS) X-ray analyzer on a standard scanning electron microscope (SEM). Results of the EDS analysis of diluted and undiluted samples were verified by comparison with results of analyses of the same sample prepared by conventional quantitative methods. Except for Cl in concentrated urines and Mg in low concentrations, good agreement was found between the methods. The analysis provides quantitation of most elements of biological interest present in concentrations of about 1 mM, while it demonstrates good linearity (r greater than 0.99) throughout a wide range of commonly encountered biological concentrations. Reproducibility of the analysis is on the order of 2% and the minimal determinable concentration is generally between 0.5 and 1.0 mM for S, P, K, and Ca and slightly more than 1.0 mM for Mg.

scholarly journals The effect of MgTiO3Adding on Inclusion Characteristics

2019 ◽  
Vol 38 (2019) ◽  
pp. 576-581
Author(s):  
Xu Chen ◽  
Zhang Mingya ◽  
Li Jianli ◽  
Ran Songlin ◽  
Shan Mengwei ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Molten Steel ◽  
Thermodynamic Calculation ◽  
Energy Dispersive Spectrometer ◽  
Energy Dispersive ◽  
Treated Sample ◽  
Scanning Electron

AbstractMgTiO3 powder was directly added into molten steel at 1873K, and its effect on inclusion characteristics was studied by a scanning electron microscope and an energy dispersive spectrometer. Thermodynamic calculation indicates that MgTiO3 is unstable in molten steel and may decompose into [Ti], [O] and MgO. However, only Ti-bearing inclusions were observed in the treated sample, and Mg-bearing inclusions were absent. This can be explained by the features of wettability and stability for MgO. Compared with a Non-treated sample, both oxide and coarse MnS in treated sample were refined. For the oxide, this originates from the formation of Ti-bearing inclusion. For coarse MnS, this may be due to the fact that Ti can aggravate S segregation. Besides, this aggravation makes coarse MnS less globular. After etching, it was found that in the treated sample, Ti-bearing inclusion can induce the nucleation of intragranular acicular ferrites. This appearance was totally different from that of Non-treated sample, and indicates the effectiveness of external adding method in oxide metallurgy.

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