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 Metalurgia

INTERNATIONAL

(magazine set-up in 1995)

 

English version, published by

romanian metallurgical foundation

 

Honorary president of  scientific publishing house f.m.r.

Dr. ec. Lepădatu v. gheorghe
 
                       

                                                        vol. XII

                                                                  (2007)

                                                                  no.4

 

romanian metallurgical foundation

Scientific publishing house

Honourary Staff

(in alphabetical order)

 

bensabra    hakim    (algeria),    BORDEA MARIUS, chabour    salem    (algeria),     gencang    yang    (china), 

  R.  S.     HOUK     (S.U.A.), I. IMRIŠ  (TECHNICAL  UNIVERSITY  OF  KOŠICE,  SLOVAK  REPUBLIC),      puşici miho (Slovenia), roşescu     gheorghe  (grecia),     roxana  ruxandra     (california),   w.m. nicola (tri. state university angola, indiana, s.u.a.), xianqing you (china)

 

 

romanian metallurgical foundation

Scientific publishing house

 

editorial  board :

 

Prof. colan horia Ph. D., member of Romanian Academy of Technical    Sciences

Prof. Coşmeleaţă georgeta Ph. D.

Prof. Elena drăgulănescu Ph. D., Catedra GDGI,  Aerospatial Engineering Faculty, Bucharest Politechnical University

Prof. Dumitrescu Constantin Ph. D., deputy member of Romanian Academy of Technical Science

Prof. French David Ph. D., CSIRO Energy Technology, Australia

Prof. Găluşcă Dan-Gelu Ph. D.

Prof. Mihaela Grigore Ph. D., University of New South Wales, Sydney, Australia

Prof. Lawson Cristopher Ph. D., Copenhague Technical Institute, Denmark

Prof. Nicolae Avram Ph. D.

Prof. Maria Nicolae Ph. D.

Prof. doc. Oprea Florea Ph. D., member of Romanian Academy of Technical Sciences

Prof. Veena Sahajwalla Ph. D., University of New South Wales, Sydney, Australia

Prof. Sakurovs Richard Ph. D., CSIRO Energy Technology, Australia

Prof. Salvo Luc Ph. D., Grenoble National Politechnical Institute, France

Prof. Saiter Jean-Marc Ph. D., Rouen University, France

Prof. Scorţea Costin Ph. D.

Prof. Simiti Ioan Vida Ph. D.

Prof. Sofroni Laurenţie Ph. D., member of Romanian Academy of Technical Sciences

Prof.  Şaban Rami Ph. D., Dean of  Materials Science Faculty, Bucharest Politechnical University

Prof. ŞTEFĂNESCU DORU Ph. D, Ohio State University   Columbus, S.U.A.

 

advisory board :

 

Prof.  bejan Mircea Ph. D

Prof.  cănănău nicolae  Ph. D

Prof.  hepuţ teodor Ph. D

Prof. Miloşan Ioan Ph. D.

Prof.  Doina Răducanu Ph. D

Prof.  samoilă Corneliu  Ph. D

Prof.  SOFONEA GALAgTION Ph. D

 

Managing Director:

Editor-in-chief:

Professor Scorţea Costin Ph. D.

 

Manager Scientific Publishing House F.M.R.:

eng. Florentina Brânduşa Scorţea

Contents

 

Issn 1582 – 2214

 

Teisanu Florin, Sontea Sever: Researches on the

utilization  of  pressurized  gases to cool the high

 speed steels when tempering ………………...… 5

 

Sofroni Laurentie, Ciobanu Ioan, Stomff Speranţa,   Maşniţă   Mihai: The   environmental

 protection by casting in sand moulds hardened

by vacuum …………………………………….... 13

 

Agop Maricel, VIZUREANU Petrică, GAVANAS-Pahome I., Ioannou  P. D.: Hydrodinamic model of

 scale relativity theory for nanomaterials (III).

Transport in nanostructures by means of a

fractal Korteweg - de Vries type equation ….... 26

 

Lechea Ionut, Ana Veteleanu, Sophie La Gallet : The characteristics of nanometric cobalt

ferittes ………………………………………...… 36

 

Alupei - Cojocariu Ovidiu, Semenescu Augustin: CIM  based   steel   profiles   processing

 systems ………………………………………… 42

 

LUCHIAN Cornelia, AMZA Gheorghe, CALEA Gheorghe, DUMITRACHE Florea, NICOLAE Avram: Contributions to weld forming when using

ultrasonic   welding   process  on   combined

materials ……………………………………..… 48

 

MILOSAN Ioan: Clean technologies applied in

 industrial ecology …………………………..…. 55

 

? FOSECO Turbostop system – reference list …I-II

? Press Release…….................………............ III - IV

? New books, published by romanian metallurgical

foundation……………….………........…...... V - VI

abstract

metalurgia International 4/2007

 

D.C.: 537

Teisanu Florin, Sontea Sever: Researches on the utilization of pressurized gases to cool the high speed steels when tempering

Metalurgia International (vol. XII), no.4, 2007, p. 5

The paper comparatively presents the classical thermal treatment of high speed steels (Rp5) at temperature below zero Celsius degrees. The results render obvious the beneficial effect of the low temperature air cooling, which could replace two the temperings from the classical cycle of thermal treatment, on the structure and properties of the tools made of high speed steels,. The research is also focused on the improvement of the working environment within the thermal treatment shops, by eliminating some processes of long time heating (annealing), with high energy consumption and noxious emissions in atmosphere by oxidation effects. The cold air is got by an ecological technology by means of a pneumatic generator, which uses compressed air as unique energy source.

 

D.C.: 621.746.628

Sofroni Laurentie, Ciobanu Ioan  , Stomff Speranţa, Maşniţă Mihai: The environmental protection by casting in sand moulds hardened by vacuum

Metalurgia International (vol. XII), no.4, 2007, p. 13

It is analysed the ecological advantages and disadvantages of some pouring procedures in temporary moulds. Is presented two versions of an ecological pouring procedure in combined moulds, experimented at ”Politechnica” University from Bucharest. The moulds are made from an active layer cold straining chemically and a support layer made from sand without bond, hardened by depressurisation. This procedure represents a combination of pouring in cold straining chemically moulds and a pouring procedure in depressurised moulds. It is shown the moulds execution stages. Also, it is presented the ecological, technological and economical advantages of this procedure in comparison with those used now (in present).

 

D.C.: 66.015.24

Agop Maricel, VIZUREANU Petrică, GAVANAS-Pahome I., Ioannou  P. D.: Hydrodinamic model of scale relativity theory for nanomaterials (III). Transport in nanostructures by means of a fractal Korteweg - de Vries type equation

Metalurgia International (vol. XII), no.4, 2007, p. 26

We suppose that the motion of micro-particles in the topological dimension DT=3 take place on continuous but non-differentiable curves, i.e. on fractals. Then, by applying the principle of scale covariance, and postulating that the passage from classical (differentiable) mechanics to a non-differentiable mechanics can be implemented by replacing the standard time derivative by time covariant derivative, a generalized Korteweg – de Vries    type   equation  is   obtained.  For an irrotational motion, case when the wave-function simultaneously becomes a complex speed potential, the correspondence with non-linear Schrödinger’s type equation is established.

The theoretical description of microphysical systems is generally based on Schrödinger’s wave mechanics, Heisenberg’s matrix mechanics, or on Feynman’s path-integral mechanics. Another approach is the hydrodynamic formulation of quantum mechanics. The scale relativity   theory (SRT) is  a  new approach   to   understand  quantum mechanics, and moreover physical domains involving scale laws, such as chaotic systems. It is based on a generalization of Einstein’s principle of relativity to scale transformations. Namely, one redefines space-time resolutions as characterizing the state of scale of reference systems, in the same way as

velocity characterizes their state of motion. Then one requires that the laws of physics apply whatever the state of the reference system, of motion (principle of motion-relativity) and of scale (principle of scale-relativity). The principle of scale-relativity is mathematically achieved by the principle of scale-covariance, requiring that the equations of physics keep their simplest form under transformations of resolution. In such conjecture, considering that the motion of micro-particles take place on continuous but non-differentiable curves, i.e. on fractals, it was demonstrated that, in the topological dimension DT=2, the geodesics of the space-time are given by a Schrödinger’s type equation. A natural generalization is the reconstruction of the previous theory in the topological dimension DT=3. Thus, postulating that the passage from classical (differentiable) mechanics to a non-differentiable mechanics can be implemented by replacing the standard time derivative by time covariant derivative, we obtain a generalized Korteweg – de Vries type equation. For an irrotational motion, case when the wave-function simultaneously becomes a complex speed potential, we establish the correspondence with non-linear Schrödinger’s type equation.

 

Key words : ferrites, cobalt, nanometer

Lechea Ionut, Ana Veteleanu, Sophie La Gallet : The characteristics of nanometric cobalt ferittes

Metalurgia International (vol. XII), no.4, 2007, p. 36

This paper presents a study made on nanometer cobalt ferrites for establishing the morphologic and structural characteristics. Also, this paper analyses the structure and the variation of grain’s size, considering the parameters of sintering.

 

Key words: steel profiles, CAD/CAM, CIM, cutting list optimization

Alupei-Cojocariu Ovidiu, Semenescu Augustin: CIM based steel profiles processing systems

Metalurgia International (vol. XII), no.4, 2007, p. 42

The growth of the steel profiles based products, used in small or larger metallic constructions induce great mutations in the fabrication systems that are forced to process an increasing number of fabrication lots with few repeating individual products. Grouping the similar parts as profiles, through a CIM based view; these products can be treated like a single product, with coded parts, and can be processed together with significant reducing costs. A Computer Aided Manufacturing concept for Steel profiles pats is introduced and illustrate with an AutoCAD based application.

 

D.C.: 621.791

LUCHIAN Cornelia, AMZA Gheorghe, CALEA Gheorghe, DUMITRACHE Florea, NICOLAE Avram: Contributions to weld forming when using ultrasonic welding process on combined materials

Metalurgia International (vol. XII), no.4, 2007, p. 48

This paper presents the main materials used in building oil distribution systems, their properties as well as the main quality standards used in building these oil distribution systems.

 

Key words: clean technology, environmental protection, industrial ecology.

MILOSAN Ioan: Clean technologies applied in industrial ecology

Metalurgia International (vol. XII), no.4, 2007, p. 55

The paper presents some aspects about the influention of the application of the clean technology over the industrial ecology. There are presented two industrial cases regarding the application of this technologies in metallurgical industry.

 

Attention!

 

E According to paragraph 2.6 of license agreement between EBSCO Publishing Inc. (U.S.A.) and FUNDAŢIA METALURGIA ROMÂNĂ   (ROMÂNIA) the  journals METALURGIA and METALURGIA INTERNAŢIONAL are  included in EP  Products, starting  from July 1st, 2006.

E These journals are included on EBSCO’s site: www.ebscohost.com , chapter „Computers and Applied Sciences Complete”, pozitions 1026 and  1027.

E Starting from January 1st  the  journal METALURGIA INTERNATIONAL is also in the SCOPUS database, belonging to ELSEVIER BIBLIOGRAPHIC DATABASES – Amsterdam (Netherlands).

 

1.      The “METALURGIA INTERNATIONAL” magazine receives manuscripts of papers including basic  scientific research and industrial  research in the following fields: metallurgy, materials science and engineering and different relating processes.

2.      Original papers not previously publishing  in any other journal, or not sent for publishing before, are accepted.

3.      After publication, the copyright is transferred to the publishing house.

4.      Every manuscript will be referred, their reports form the basis of the Editor’s decision.

5.      The manuscripts sent to the Editor  will not returned to the author, even  they are not published.

6.      The manuscripts will be sent to the following address:

METALURGIA INTERNATIONAL

83, Calea Griviţei, sector 1, Postal code 010705, postal office 12

Bucharest, Romania

Tel.:  +(40)-1-310 71 38; +(40)-1-0722 665 071; Fax: +(40)-1-310 71 38

E-mail: redactia@metalurgia.ro; See also web: www.metalurgia.ro

REDACTION

 

Copyright © 2007 The f.m.r. scientific publishing house, accredited by the romanian council for universitary research