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© 2007 editura
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EURO 120 Manager Scientific Publishing House F.M.R.: eng. Florentina
Brânduşa Scorţea Assistant-secretary Editura Ştiinţifică F.M.R. ANCA ION |
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.8 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. 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) |
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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, Romania 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 Dr. Ec. Lepădatu
V.Gheorghe, Demetrius Cantemir Christian University,
Bucharest, Romania 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. 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. Prof.VASIU Teodor Ph. D., Faculty of „Engineering” in 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. semenescu
augustin ph. d Prof. SOFONEA GALAgTION
Ph. D Prof. VARGA
BELA Ph. D Managing Director: Editor-in-chief: Professor Scorţea
Costin Ph. D. |
Contents Issn 1582 – 2214 VARGA Bela, Bedő
Tibor, Cozma R., Bobancu S.: Wear
strenght of Al-Si alloys fused with low-melting elements ……… 5 GEAMĂN
Virgil: High pressure
processing of food ……………………………….…
10 Simona BOICIUC, Sanda LEVCOVICI, LEVCOVICI Dan T.: Structural modifications in laser cladding layers heating up at different
temperatures ……………...… 14 Ana Socalici, Erika Ardelean, Heput Teodor,
Ardelean Marius, Ana Josan: Solidification simulation of the continuous cast blanks with micro-coolants added in the mould
…………………………... 20 Ana-Luciana Rus, Frunză Dan: Grain refinement and superplasticity of 2024 aluminium
alloy ………………………. 26 ? FOSECO
Turbostop system – reference list… I-II ? Press
Release..............…..…………..…...... III-VII ? New books,
published by romanian metallurgical
foundation……………….……….....…..... VIII-IX |
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abstract
metalurgia International 8/2007
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Key words: Al-Si alloys, wear strength, anti-friction
properties VARGA Bela, Bedő
Tibor, Cozma R., Bobancu S.: Wear
strenght of Al-Si alloys fused with low-melting elements Metalurgia International (vol. XII), no.8, 2007,
p. 5 The paper discusses anti-friction and wear strength
properties of standard and non-standard Al-Si alloys, in dependence on their
conditions of smelting casting. The wear behaviour of the two alloys shows
that for the tested compositions wear strength is determined mainly by the
elements dissolved in the alpha solid solution, and less by the primary
segregations of silicon. Key words: Food processing, High Pressure Processing (HPP),
pasteurization GEAMĂN
Virgil: High pressure
processing of food Metalurgia International (vol. XII), no.8, 2007,
p. 10 In addition to traditional thermal pasteurization,
other technologies can satisfy the definition of pasteurization for certain
foods: ohmic heating, microwave heating, steam and hot water treatments, high
pressure processing (HPP), UV radiation, irradiation, pulsed electric field,
and chemical treatments. Other technologies, such as filtration, infrared and
high voltage arc discharge, may also have the potential to be used alone or
in combination with other treatments. The paper presents some experimental
data obtained by manufacturing due high processing of food – a new tendency
in the food industry. Key
words: laser cladding, nickel alloy,
microstructure Simona BOICIUC, Sanda LEVCOVICI, LEVCOVICI Dan T.: Structural modifications in laser cladding layers
heating up at different temperatures Metalurgia International (vol. XII), no.8, 2007,
p. 14 In hereby work paper it was reported the structural
modifications of several many-layer claddings achieved by powder injection of
Ni alloy from the Ni-Cr-B-Fe-Al system, in the bath melt by CO2 laser
in continuous wave, heating up at different temperatures. It was pursued the
variation of layer cladding hardness with the temperature, and with the
keeping time. Key words: casting, solidification, simulation, steel,
micro-coolants, mould Ana Socalici, Erika Ardelean, Heput Teodor,
Ardelean Marius, Ana Josan: Solidification
simulation of the continuous cast blanks with micro-coolants added in the
mould Metalurgia International (vol. XII), no.8, 2007,
p. 20 The paper presents the obtained results in case of
simulating the solidification of the continuous cast blank with micro-coolant
addition in the mould. The simulation was made with the help of our own
program TURNCON, carried out in the language C++ and which works under
platforms Win32 (that means Windows 95, 98, Me, NT4, 2000, XP – with an Intel
processor). The program allows both a uniform distribution of the micro-coolants
and a haphazard distribution, respectively a haphazard repeatable
distribution. The diagrams shown represent the |
blank
solidification simulation in case of the haphazard repeatable distribution of
the micro-coolants in the mould of the continuous casting machine, because
this case is the closest to their addition in the industrial practice. Key words: aluminum
alloy, superplasticity, thermomechanical processing, flow stress, strain rate Ana-Luciana Rus, Frunză Dan: Grain Refinement and superplasticity of 2024
aluminium alloy Metalurgia International (vol. XII), no.8, 2007,
p. 26 In recent years, there was a rapid growth in interest of superplastic
aluminum alloys. A few alloys have been designed for superplasticity but it
is likely that this approach is limited in view of the cautions, outlook of
designers and metal users, particularly those in the aerospace sector. The
dominant current approach is to take an alloy with well established service
properties and to process it to develop superplasticity.
The experiments were conducted using a commercial
2024-T3 aluminum alloys produced by S.C. ALPROM S.A. Slatina, Romania. The
material was produced in the form of extruded bar with a diameter of 22 mm.
Chemical composition (in wt%) of the received samples is: 4.955 Cu; 1.322 Mg;
0.437 Mn; 0.358 Zn; 0.300 Fe; 0.119 Si; 0.017 Cr; 0.005 Sn; 0.005 Sb; 0.005
Pb; 0.003 Ni; Al-balance. Because the ductility of 2024 aluminum alloy
as-received is small (tensile elongation smaller than 108% for round samples
with gauge length of 25 mm and diameter of 5 mm, testied by tensile testing
at the temperatures and strain rates used in this researches), the material
was processed thermomechanical (this is a method to increase the ductility
through grain refinement). A special thermomechanical processing was developed
for this alloy to obtain a fine structure before superplastic testing. The
specimens from the received material with length of 60 mm and diameter of 22
mm, were homogenized at 5000C for 8 hour, reduced by hot rolling
at 440÷4800C to 7 mm strip thickness and water quenched. Then the
samples were cold rolled to 3 mm thickness. The specimens were fast heated up
to high temperature (4800C), held for 10-15 minutes and then fast
quenched in water followed by 30 minutes soaked at 3500C in order
to make fine-grained structure stable. Fine stable microstructures can be developed by
thermomechanical processing of 2024 commercially aluminum alloy. The plastic
deformation of this material was investigated in a temperature range between
450÷4800C and the strain rate range of 1x10-3÷1x10-2
s-1. The deformation characteristics were correlated with the
results of microstructure investigation. The material have a potential for
superplastic behavior during deformation at temperatures of about 4600C
and 4800C. Tensile elongations to failure in excess of 200% were
obtained in strain rate range 1x10-3÷1.5x10-3 s-1
at 4600C and 5x10-3 s-1 at 4800C,
and materials may be bulge formed. The grain size after thermomechanical
processing was 5÷8 μm. The microstructure exhibited exceptional
stability at 4600C, due to the presence
of precipitates of Al-Mn. |
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