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Metalurgia
revistă fondată ξn 1948 Revistă editată de editura
ştiinţifică f.m.r. preşedintele onorific al editurii ştiinţifice f.m.r. Dr. Ec. Lepădatu
V.Gheorghe Nr.11 noiembrie 2005
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preşedinTii colegiilor de redacţie Prof. dr.
ing. NICOLAE AVRAM Prof. dr.
ing. SCORŢEA COSTIN |
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colegiul
onorific (ξn ordine alfabetică) I.Εgren (Suedia), ameling dieter (GERMANIA),
bensabra hakim (algeria), borş ionel,
bordea marius, chabour salem
(algeria), chiriac cornel, chiţu
gheorghe, constantin radu, dobra
gheorghe,dumitrescu constantin, FRANCISCA PORUSKI (OHIO STATE UNIVERSITY, U.S.A.),
gencang yang (china), P.D. hodgson (deakin university, Australia), R. S.
HOUK (S.U.A.),T.Y.Hsu (China), I. IMRI (TECHNICAL UNIVERSITY OF KOICE, SLOVAK
REPUBLIC), ioanromulus, jiang wan
(china), 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), TAKEHIDE
SENUMA (OKAYAMA UNIVERSITY), TATEO USUI (OSAKA UNIVERSITY),TOBIAS FRANKE
(COLORADO UNIVERSITY, U.S.A.), văzdăuţeanu vasile, xianqing
you (china) |
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Preşedinte
al colegiului executiv de redacţie Prof. dr. ing.
SCORŢEA COSTIN Colegiul
executiv Prof. dr. ing. bejan
Mircea Prof. dr. ing. cănănău
nicolae Prof. dr. ing. GĂLUŞCĂ DAN GELU Prof. dr. ing. hepuţ teodor Prof. dr. ing. IONIŢĂ GHEORGHE Conf.dr. ing. TODERIŢA
NEMEŞ Prof. dr. ing. MARIA NICOLAE Prof. dr. ing. Ripoşan Iulian 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. BRΒNDUŞA FLORENTINA SCORŢEA Asistent
Editura Ştiinţifică F.M.R. Procesare -tehnoredactare: ANCA ION |
SUMAR ISSN 0461-9579 NĂSTASE Constantin: Cercetări privind mişcarea ξn regim permanent, a
gazelor, ξn medii poroase cu
permeabilitate constantă
...
.. 5 Tintelecan Constantin Marius: Pierderea prin trefilare a straturilor de Zn respectiv de Zn-Al, depuse
pe suprafaţa sβrmelor de oţel
..... 9 BORDEA Marius: Raţionalizarea
consumurilor condiţie esenţială pentru conducerea optimală a
cuptoarelor metalurgice
.......................................................................................
16 Ana-Luciana Rus: Superplasticitatea
de microgranulaţie
...
. 20 Ciobanu Ioan, Crişan
Aurel, Munteanu Sorin IoN : Influenţa caracteristicilor termofizice ale
formelor de turnare asupra modulului de solidificare real
. 26 + Ştiri
........................................................................................................................................ I + Ştiri de presă
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III + Semnalări
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V + Producţia
mondială de oţel
.. IX +Evenimente Internaţionale
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XI ͺ
Congrese
Conferinţe Ξntβlniri
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. XI + Noutăţi din trecut
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XIII + Aniversări
siderurgice ξn trimestrul III-2005
... XV + Cărţi
apărute la Editura
Ştiinţifică F.M.R
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- XX + Revista revistelor
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8, 15, 25, IV, X, XII, XIV, XVI |
abstract metalurgia 11/2005
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D.C.:
543.27 NĂSTASE Constantin: Researches regarding permanent regime motion of gases in porous
environment with constant permeability Metalurgia
(57) 2005, nr. 11, p. 5 Gases, as compressible fluids, going out through pipe faults,
enter the porous environment surrounding them. In case of a fault having a long existence in a pipe,
the gas flow becomes stationary. Immediately after the formation of a fault,
gas flow through porous environment could be nonstationary. In this area, there are important permeability
variations, and Klinkenberg effect is present due to the low pressure under
which the flow is going on. D.C.: 621.778.1 Key words: drawing, steel wire, protective layer, Zn layer, Zn-Al
layer, loss by drawing Tintelecan Constantin Marius: The loss of Zn (respective Zn-Al) layers by drawing, layers deposited
on steel wires surface Metalurgia (57) 2005, nr. 11, p. 9 This paper evaluates the
loss rate of the protective layer (of Zn respective Zn-Al alloy, deposited on
steel wire surface from specific meltings, so in Hot Dip variant) recorded
for successive drawings of steel wire. Are necessary to be
emphasized from start three remarks: 1.
In Romania, in this moment, are produced only
galvanized-drawn wires (so only the first mentioned variant). 2.
The determination of the loss rate of protective layer
was realized by statistical analysis of great volume, of the protective
layers thickness resulted by successive drawings. 3.
Zn-Al alloy has chemical composition as to the eutectic
point from equilibrium diagram Zn-Al. In paper the term steel wire will be replaced with
the term OLC 50X wire, OLC 50X being the steel used for experiments. D.C.: 621.785.012 BORDEA Marius: Consuption rationalizing the essential condition for optimal
conducting of metalurgical furnaces Metalurgia
(57) 2005, nr. 11, p. 16 The consumption necessed for analyzing the |
efficient
functioning of EAF is defined. The problem of minimizing fuel and electrical power
consumption is approached. The mesures of rationalizind are detaoled: the
estensive heat using, the intensive using of energy, intensifing
technological processes, heat loss reduction, the expantion of mixt processes
(fuel+electrical power), using performant building materials. D.C.: 539.374 Key
words: superplasticity, flow stress,
strain rate, strain rate sensitivity exponent, grain boundary Ana-Luciana Rus: Micrograin superplasticity Metalurgia (57) 2005, nr. 11, p. 20 There are two types of superplastic
behavior in polycrystalline solids: micrograin superplasticity and
internal-stress superplasticity. The first type of superplastic behavior, and
the best known and studied, is the micrograin superplasticity. The structural
prerequisites for developing micrograin superplasticity are: size of grains,
nature, mobility and shape of grain boundaries, and strength, size and
distribution of second phase in the matrix. This paper attempts to review the
structural prerequisites for superplastic materials of micrograin and the
materials that exhibit micrograin superplasticity. D.C.: 621.746.628 Ciobanu Ioan, Crişan Aurel, Munteanu Sorin Ion: The influence of the thermal characteristics of moulds on the real
solidification module Metalurgia (57) 2005, nr. 11, p. 26 In some previous papers the authors defined the concept
of real solidification module. It is shown that the use of external coolers
or heat insulating collars in the moulds modifies the real solidification
module of some zones of the castings and implicit the total solidification
module of the casting. In this paper there are established the equations to
calculate the cooling coefficients used to calculate the real solidification
module in the case of using coolers or heat insulating materials. There were
established the equations to determine the thermal characteristics of the
special materials (coolers or heat insulating materials) and the surface that
must be covered with this kind of materials to obtain the multiplication of
the real solidification module with a factor
n in rapport with the geometric module (ideal). |