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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.7 romanian metallurgical
foundation Scientific publishing
house |
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Honourary
Staff (in alphabetical order) bensabra hakim
(algeria), BORDEA MARIUS, chabour salem
(algeria), gencang yang
(china), R.
S. HOUK (S.U.A.), I. IMRI (TECHNICAL
UNIVERSITY OF KOICE,
SLOVAK REPUBLIC), pușici miho (Slovenia), roșescu gheorghe
(grecia), roxana ruxandra
(california), w.m. nicola
(tri. state university angola, indiana, s.u.a.), xianqing you (china) |
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editorial
board : Prof. colan horia Ph. D., member of Romanian Academy of
Technical Sciences Prof. Coșmeleață 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. Gălușcă 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. Scorțea Costin Ph. D. Prof. Simiti Ioan Vida Ph. D. Prof.
Sofroni Laurenție Ph. D., member of
Romanian Academy of Technical Sciences Prof. Șaban Rami Ph. D., Dean of Materials Science Faculty, Bucharest
Politechnical University Prof. ȘTEFĂNESCU DORU Ph. D, Ohio State University Columbus, S.U.A. advisory board : Prof. bejan Mircea Ph. D Prof. cănănău nicolae Ph. D Prof. hepuț teodor Ph. D Prof. Miloșan Ioan Ph.
D. Prof. Doina Răducanu Ph. D Prof. samoilă Corneliu
Ph. D Prof. SOFONEA GALAgTION
Ph. D Prof. VARGA
BELA Ph. D Managing Director: Editor-in-chief: Professor Scorțea
Costin Ph. D. Manager Scientific Publishing House F.M.R.: eng. Florentina
Brândușa Scorțea |
Contents Issn 1582 2214 Maria
NICOLAE, Irina VÎLCIU, Avram NICOLAE, Radu VÂRLAN: Improving
the lubrication process during cold rolling by using the cavitation phenomenon
in liquids
..
5 Avram NICOLAE, Maria NICOLAE, Netty
Brândușa MILEA,
Radu VÂRLAN: Contribution of double reversible cold
drawing to the increase of plates
quality for enamelling
... 10 Ciobanu Ioan, Mașniță Mihai, Monescu Vlad, Roșescu
gheorghe: Research concerning castings solidification with section T
. 18 VASIU Teodor, Diana STOICA: Methods to determine the preventive maintenance cycles of rolling mills
... 27 Munteanu
I. Sorin, Ciobanu Ioan, Crisan Aurel, Masnita Mihai, Avram Nengis, STROE
Florin: Experimental and computer simulation Researches about the hot spots position during the solidification of bars with
U section
...
35 LEVCOVICI LEVCOVICI
Dan T., Sanda LEVCOVICI, Simona BOICIUC: Studies and researches regarding
laser cladding of nickel alloys on a steel support
.... 41 MILOSAN Ioan: Study about
the mechanical properties
of a cryogenic S.G. cast iron
. 47 ? FOSECO
Turbostop system reference list
I-II ? Press
Release..............
..
..
...... III-V ? New books,
published by romanian metallurgical
foundation
.
........
..... VI-VII |
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abstract
metalurgia International 7/2007
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D.C.: 621.745.44 Maria NICOLAE, Irina
VÎLCIU, Avram NICOLAE, Radu VÂRLAN: Improving the lubrication process
during cold rolling by using the cavitation phenomenon in liquids Metalurgia International (vol. XII), no.7, 2007,
p. 5 One of the important parameters which have influence
on cold rolling is the stability of emulsions used for lubrication. When
launching the research theme, one considered that the stability of water-oil
emulsions can be improved using the effect of cavitation in liquids. One
performed researches on an original installation using the cavitation effect
for activation. The investigations results presented concern: the stability
of emulsion processed by cavitation, its application effect on the relative
reduction at a pass and on the
number of passes required by the
technology. D.C.: 574 Avram NICOLAE, Maria NICOLAE, Netty
Brândușa MILEA,
Radu VÂRLAN: Contribution of double reversible cold
drawing to the increase of plates quality for enamelling Metalurgia International (vol. XII), no.7, 2007,
p. 10 There
are researches aiming to substitute the simple cold drawing by the reversible
double cold drawing in order to manufacture plates for enamelling. The
experiments (running on small and on large scale) had in view to state the
quality of adherence to enamelling for both manufacturing versions (simple
cold drawing and double cold drawing). One presents, also, the results
concerning the connection between cold drawing and enamelling using the
metallographic structures and mechanical properties. D.C.: 621.746.628 Ciobanu Ioan, Mașniță Mihai, Monescu Vlad, Roșescu
gheorghe: Research concerning
castings solidification with section T Metalurgia International (vol. XII), no.7, 2007,
p. 18 It was made a research by
computer simulation of the solidification regarding castings solidification
with section T. It was analysed the influence of the rib thickness and
length at the T-shaped walls intersection over the solidification time,
over the shape coefficient and over the thermal nodes position. Key
words: the preventive maintenance
cycles of rolling mills VASIU
Teodor, Diana STOICA: Methods to
determine the preventive maintenance cycles of rolling mills Metalurgia International (vol. XII), no.7, 2007,
p. 27 This survey presents
two mathematical models of |
preventive
maintenance that take into account stochastic factors which influence the
failure rates and working life of an entity. The models are hybrid so that
they combine the reduction of proper operation time with failure rate. The
starty point consists in idea that preventive maintenance is done with
imperfections: it is not reduced the proper operation only but it is
increased the probability of entity failure as much as the number of
maintenance is increased. The target of this survey is to determine the
optimal graphic of planned maintenance activities either to reduce the
related costs or to maintain the reliability above a prescribed minimum level. Key
words: casting, simulation,
solidification. Munteanu
I. Sorin, Ciobanu Ioan, Crisan Aurel, Masnita Mihai, Avram Nengis, STROE
Florin: Experimental and computer simulation researches about the hot spots
position during the solidification of bars with U section Metalurgia International (vol. XII), no.7, 2007,
p. 35 There are shown the results of an
experimental research on the solidification of bars with U
section. It was analyzed the influence of inner opening of the U
profile on the hot spot position. The
experimental results are compared with the results obtained simulating the
solidification on computer. Key
words : laser cladding, nickel
alloy, microstructure LEVCOVICI T., Sanda LEVCOVICI, Simona BOICIUC: Studies and researches regarding laser cladding of
nickel alloys on a steel support Metalurgia International (vol. XII), no.7, 2007,
p. 41 In order to increase the wear and corrosion
resistance of 0.45% C surface steel layers, a multilayer
coating was tested by injection, in the melted bath produced using a CO2 continuous
wave laser, of a powder with 8.9%
Cr, 4.5% Fe, 5.1% B, 2.4% Al, 0.6% Cu, all remainder of Ni. To determine the
optimum melting regime, the layers obtained by different laser conditions
were characterized by HV5 hardness, macro and
microstructure analysis. Key
words: Materials Science, S.G. Cast
Irons, A.D.I., low temperature, mechanical properties MILOSAN Ioan: Study
about the mechanical properties of a cryogenic S.G. cast iron Metalurgia International (vol. XII), no.7, 2007,
p. 47 The paper
presents the influence of the temperature and the maintained time at the
isothermal level over the structure and properties of a nodular cast iron
maintained at some low temperatures. |
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1. The METALURGIA INTERNATIONAL magazine
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