Operating parameters for the continuous unidirectional solidification of the Al-1wt.% Si alloy drawn to fine wire

2000 ◽  
Vol 6 (6) ◽  
pp. 491-495
Author(s):  
M. H. Kim ◽  
H. H. Jo ◽  
H. Y. Cho
Keyword(s):  
Unidirectional Solidification ◽  
Operating Parameters ◽  
Fine Wire

Precipitation and growth of MnS inclusion in an austenitic hot-work die steel during ESR solidification process

2019 ◽  
Vol 116 (3) ◽  
pp. 322 ◽  
Author(s):  
Yongfeng Qi ◽  
Jing Li ◽  
Chengbin Shi ◽  
Hao Wang ◽  
Dingli Zheng
Keyword(s):  
Cooling Rate ◽  
Solidification Process ◽  
Unidirectional Solidification ◽  
Electroslag Remelting ◽  
Operating Parameters ◽  
Number Density ◽  
Die Steel ◽  
Solidification Model ◽  
Starting Time ◽  
Hot Work Die

This study follows a previous presentation of metallurgical results and operating parameters about the comparison between conventional ESR and continuous unidirectional solidification of electroslag remelting (ESR-CDS) and more precisely the effect of cooling rate on the precipitation and growth of inclusions in an austenitic hot-work die steel [Y.F. Qi, J. Li, C.B. Shi, R.M. Geng, J. Zhang, Effect of directional solidification in electroslag remelting on the microstructure and cleanliness of an austenitic hot-work die steel, ISIJ Int. 58, 1275–1284 (2018)]. A thermodynamic study, a classical solidification model and a growth model for MnS inclusions were used orderly to interpret the metallurgical results. Optical microscopy (OM) and scanning electron microscopy (SEM) were used to characterize microstructure and inclusions (i.e. number, size, morphology and distribution) in the as-cast ingots. The results showed that the as-cast microstructure was refined and the dendritic arm spacings were reduced through ESR-CDS process. The characteristics of inclusions showed that the number density and the size of inclusions in ingot were much more reduced through ESR-CDS process in comparison with ESR process. The starting time for the precipitation of MnS inclusion is retarded, which is due to the segregation of elements Mn and S lowered by higher cooling rate in ESR-CDS in comparison with that in ESR. The starting time for the precipitation of MnS inclusion in ESR was fs = 0.92, while that in ESR-CDS was fs = 0.95.

Application of Improved Voltage Compensation in the SEM to Imaging of Organic Materials

1973 ◽  
Vol 31 ◽  
pp. 444-445
Author(s):  
P.J. Killingworth ◽  
M. Warren
Keyword(s):  
Electron Beam ◽  
Organic Materials ◽  
Operating Parameters ◽  
Low Density ◽  
Beam Diameter ◽  
Incident Electron Beam ◽  
Specimen Material ◽  
Voltage Compensation ◽  
Selection Of ◽  
Scanning Electron

Ultimate resolution in the scanning electron microscope is determined not only by the diameter of the incident electron beam, but by interaction of that beam with the specimen material. Generally, while minimum beam diameter diminishes with increasing voltage, due to the reduced effect of aberration component and magnetic interference, the excited volume within the sample increases with electron energy. Thus, for any given material and imaging signal, there is an optimum volt age to achieve best resolution.In the case of organic materials, which are in general of low density and electric ally non-conducting; and may in addition be susceptible to radiation and heat damage, the selection of correct operating parameters is extremely critical and is achiev ed by interative adjustment.

Electron sources: Past, present, and future

1993 ◽  
Vol 51 ◽  
pp. 764-765
Author(s):  
David C Joy
Keyword(s):  
Glass Tube ◽  
Source Size ◽  
Electron Gun ◽  
Operating Parameters ◽  
Operational Parameters ◽  
Electron Sources ◽  
Difficult Decision ◽  
Probe Size ◽  
Wide Range ◽  
Overall Performance

The electron source is the most important component of the Scanning electron microscope (SEM) since it is this which will determine the overall performance of the machine. The gun performance can be described in terms of quantities such as its brightness, its source size, its energy spread, and its stability and, depending on the chosen application, any of these factors may be the most significant one. The task of the electron gun in an SEM is, in fact, particularly difficult because of the very wide range of operational parameters that may be required e.g a variation in probe size of from a few angstroms to a few microns, and a probe current which may go from less than a pico-amp to more than a microamp. This wide range of operating parameters makes the choice of the optimum source for scanning microscopy a difficult decision.Historically, the first step up from the sealed glass tube ‘cathode ray generator’ was the simple, diode, tungsten thermionic emitter.

RESEARCH ON OPERATING PARAMETERS OF COPPER-WATER LOOP HEAT PIPES WITH FLAT EVAPORATOR

2014 ◽  
Vol 5 (1-4) ◽  
pp. 327-334
Author(s):  
M. Chernysheva ◽  
Svetlana I. Yushakova ◽  
Yury F. Maydanik
Keyword(s):  
Heat Pipes ◽  
Operating Parameters ◽  
Loop Heat Pipes ◽  
Copper Water ◽  
Flat Evaporator

THE INFLUENCE OF OPERATING PARAMETERS ON THE TEMPERATURE DISTRIBUTION IN FLIGHTED ROTARY DRUMS

2018 ◽  
Author(s):  
Jakob Seidenbecher ◽  
Fabian Herz ◽  
Eckehard Specht ◽  
S. Wirtz ◽  
A. Berndt ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Operating Parameters

Devices for Synchronized Phasor Measurements of Electric Power System Operating Parameters under Different Conditions of Their Operation

2018 ◽  
Vol 6 (6) ◽  
pp. 16-23
Author(s):  
Boris K. MAKSIMOV ◽  
◽  
Tat’yana G. KLIMOVA ◽  
Andrei V. ZHUKOV ◽  
Dmitrii M. DUBININ ◽  
...  
Keyword(s):  
Power System ◽  
Electric Power ◽  
Electric Power System ◽  
Operating Parameters ◽  
Phasor Measurements ◽  
System Operating

An Algorithm for Calculating the Operating Parameters of Hydroelectric Power Plants in the Power System Load Curves Using Compensated Electrical Runoff Regulation

Vestnik MEI ◽  
2018 ◽  
Vol 2 (2) ◽  
pp. 14-20
Author(s):  
Aleksey Yu. Aleksandrovskiy ◽  
◽  
Vladimir V. Klimenko ◽  
Dmitriy M. Volkov ◽  
◽  
...  
Keyword(s):  
Power System ◽  
Power Plants ◽  
Operating Parameters ◽  
Hydroelectric Power ◽  
System Load ◽  
Runoff Regulation ◽  
Hydroelectric Power Plants

The Identification of Pre-Failure Conditions of Oil Coolers of NPP MCP by Operating Parameters

2020 ◽  
Vol 37 (4) ◽  
pp. 82-90
Author(s):  
V.V. Krivin ◽  
V.Ya. Shpicer ◽  
V.A. Tolstov ◽  
I.O. Ishigov
Keyword(s):  
Operating Parameters ◽  
Failure Conditions
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