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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

Publication de 4  numéros par an

ISSN Imprimer: 1093-3611

ISSN En ligne: 1940-4360

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 0.4 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.1 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00005 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.07 SJR: 0.198 SNIP: 0.48 CiteScore™:: 1.1 H-Index: 20

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ANALYSIS OF SOME ELECTRICAL DISCHARGE MACHINING MECHANISMS

Volume 5, Numéro 3, 2001, 15 pages
DOI: 10.1615/HighTempMatProc.v5.i3.140
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RÉSUMÉ

Electric Discharge Machining (EDM) is a process in which an electric discharge in a dielectric liquid involves electrodes erosion of the device. Generally, erosion of one of the electrodes is faster than for the other. A current impulse generates an electric discharge that evolves of a spark toward an arc discharge, provided that the length of the current impulse is sufficiently long. The constituting material of treated electrodes is present in the created plasma, as attests apparition of emitted spectral lines.
In the EDM process, the copper anode is not eroded. In contrary, the steel cathode can be eroded when the current impulse is sufficiently high. To have a better understanding of processes caused by EDM plasmas which play a role in erosion, including the physical and chemical transformations in electrodes, it is important to analyse the materials issued of erosion: i.e. ejected particles and electrodes after treatment. Their observation and study by techniques usual in material science has been undertaken. Composition studies have shown enrichment with carbon for the steel ejected residual particles and cathode surface, on a depth of around 20 mm. The electrode surface suffers also a morphological evolution with cavities formation. Chemical analysis of residual particles shows chromium vaporisation during the EDM process. The liquid metal surface tension could be modified by migration of carbon and chromium what may be important in erosion efficiency.

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