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preşedinTii colegiilor de redacţie Prof. dr. ing. NICOLAE AVRAM Prof. dr. ing. SCORŢEA COSTIN colegiul onorific (în ordine alfabetică) I.Ågren (Suedia), dieter ameling (GERMANIA), borş ionel, bordea marius, chiriac cornel, constantin radu, dobra gheorghe, dumitrescu constantin, R. S. HOUK (S.U.A.), T.Y.Hsu (China), ioan romulus, christopher lawson (danemarca), y. matsubara (Japonia), moldovan petre, nicolae avram, D. R. J. OWEN (SWANSEA, UK), radu nicu, roşescu gheorghe (grecia), roxana ruxandra (california), sofroni laurenţie, Jean-marc saiter (franţa),tudor paul, văzdăuţeanu vasile
Preşedinte al colegiului executiv de redacţie Prof. dr. ing. SCORŢEA COSTIN Colegiul executiv Prof. dr. ing. bejan Mircea Prof. dr. ing. bunea Daniel Prof. dr. ing. cănănău nicolae Prof. dr. ing. GEORGETA COŞMELEAŢĂ Prof. dr. ing. CIUCĂ ION Prof. dr. ing. gaba aurel Prof. dr. ing. GĂLUŞCĂ DAN GELU Prof. dr. ing. hepuţ teodor Prof. dr. ing. IONIŢĂ GHEORGHE Prof. dr. ing. mănescu tiberiu Conf. dr. ing. TODERIŢA NEMEŞ Prof. dr. ing. samoilă Corneliu Prof. dr. ing. SCORŢEA COSTIN Prof. dr. ing. SIMITI IOAN VIDA Prof. dr. ing. SOFONEA GALAFTION Prof. dr. ing. Şaban Rami Corpul referenţilor ştiinţifici Prof. dr. ing. anişoara ciocan, Prof. dr. ing. Crişan Aurel, Prof. dr. ing. constantin Nicolae, Prof. dr .ing. Miloşan Ioan, Prof. dr. ing. Nagy Emil, Prof. dr. ing. Maria Nicolae, Prof. dr. ing. Tamara radu, Prof. dr. ing. Doina Răducanu, Conf. dr. ing. Semenescu Augustin, Conf. dr. ing. Vizureanu Petrică Director General Editura Ştiinţifică F.M.R. Redactor Şef. Ing. BRÂNDUŞA FLORENTINA SCORŢEA Asistent Editura Ştiinţifică F.M.R. Procesare -tehnoredactare: ANCA ION	SUMAR ISSN 0461-9579 Potecaşu Octavian, Florentina Potecaşu, Alexandru Petrică: Compozite cu matrice polimerică durificate cu roci din munţii Macin ................................................................................................. 5 Alexandru Petrică, Florentina Potecaşu: Deformarea plastică a tablelor din oţel pentru emailare şi tendinţa de formare a defectelor de tip “solzi de peşte” în stratul de email ............................................ 10 Ciobanu Ioan, Munteanu Sorin Ion, Crişan Aurel: Modelarea matematică ID a macrosolidificării pieselor turnate din fonte cenuşii hipoeutectice ......................................................................................... 18 Burlacu Gabriel: Tehnologia de fabricaţie şi fiabilitatea coturilor forjate utilizate în instalaţii industriale ..................................................... 30 Alina Adriana Minea: Optimizarea funcţionării unui cuptor electric cu radiaţie, prin schimbarea regimului de circulaţie al aerului ........................................................................................................ 42 + Informaţii din metalurgia mondială …………….……........……………………...…… I + Ştiri ……………………………………………...……………………..…………………... II + Semnalăr i……………………………………………………………………..…………… III +Evenimente Internaţionale …………………...……………..……….………… IV ª Congrese-întâlniri-conferinţe-târguri-expoziţii-manifestări …………………… IV + Cărţi apărute la Editura Ştiinţifică F.M.R ………….………......…………............. VII-X + Revista revistelor …………………………………………………………………... 9, 17, 48

abstract metalurgia 3/2005

D.C.: 669.018.25 Potecaşu Octavian, Florentina Potecaşu, Alexandru PetricĂ:: Composites with polymeric matrix, hardened with Măcin Mountains granite rock particles Metalurgia (57) 2005, nr.3, p.5 The paper presents the results of the authors’ scientific research on a composite material with polymeric matrix, hardened with rock particles, granite type. It was studied the influence of the hardened phase grain and the quantity of resin on the compression resistance of the product. These weather resistant materials have a long period of ageing, a permanent finishing and require almost no maintenance. For the research granite from the Măcin Mountains, Dobrogea Romania with greenish shade was used, which was crushed and then granulometric sorted. Granite is an acid volcanic rock, with over 65% SiO2 in its components, to which CaO, MgO, R2O2, MnO2, TiO2, Fe2O3, etc. in different rates is added; it has granular structure and massive texture. Polyesteric thermorigid resin was used for the matrix. These resins can be characterized by: easy obtaining, and accessibility of the raw materials, quick strengthening without side-off products, good coloring features, transparency, good chemical resistance at unrusty acids and alcohols. Composite samples were made through shaping in steel matrix. After shaping and maturation, the samples were tried at compression. D.C.: 539.374 Alexandru Petrică, Florentina Potecaşu: The plastic deformation of steel sheets and sensibility for “fishscale” defects of the enamelling layer Metalurgia (57) 2005, nr.3, p.10 The paperwork presents, at first, in principle enamelling technology for products obtained from sheet-iron then is described the mechanism formation of defects called " fishscales", the manner of act avoided the appearance, method of measure the sensibility for this defect and the own researches: the connection among the degree of cold-working and the “fishscales” probability appearance. D.C.: 669.162.275.144 Keywords: mathematical model, solidification, hypoeutectic cast iron, casting. Ciobanu Ioan, Munteanu Sorin Ion, Crişan Aurel :1D mathematical modeling for the macro-solidification of cast parts in hypoeutectic grey cast irons Metalurgia (57) 2005, nr.3, p.18 The paper presents a model and a software for the

macro-solidification of parts cast in hypoeutectic cast iron. There are presented the hypothesis that lay on the base of the realized mathematical model. The model uses the finite differences method and is initially conceived in 1D, following to be extended to 2D and 3D. The mathematical model starts from thermal balance equation for an elementary layer of xi thickness and an elementary time interval Dt. In the case of hypoeutectic cast iron there were stand out 16 situations for which it was necessary to detail the thermal balance equation. There are presented the mathematical equations that form the mathematical model and their usage in the software. There are presented two, the software structure and the possibilities of using this software during the research about the solidification of parts cast from hypoeutectic alloys. D.C.: 621.73 Burlacu Gabriel: Process and reliability of forged elbows utilised in industrial systems Metalurgia (57) 2005, nr.3, p.30 D.C.: 669.041.38 Alina Adriana Minea: Radiation electrical furnace optimization by changing the air circulation Metalurgia (57) 2005, nr.3, p.42 An actual trend in hot working industrial processes development it consists in computer assisted technologies and heat treatment furnaces, combined with reduced energetically consumptions. The proposed methodology, for studying the functional optimization of the radiation electrical furnaces is: - adapting for the furnace a command and control equipment, assisted by computer, - constructive and functional modification of the furnace heat chamber, - programmed experiment and analytical interpretation of the results. Constructive and functional modification of the furnace heat chamber consists in variation of the distance between panels and furnace walls. This variation is given by an angle of variation. Experimentally, it can be observed that by changing the heat chamber geometry – modifying the panels angle – we obtained energetical advantages. In conclusion, adopting of an adequate constructive design for the two radiative panels leads to remarkable economical effects, concomitant with assuring of the technical conditions imposed to heat treatment operations.