|
Editorial office and administration: Editura Științifică F.M.R.,
Calea Griviței,
nr. 83, sector 1, O.P.12, cod 010705, Bucharest,
ROMANIA Tel.:
+(40)-1-650 60 59, +(40)-1-0722 665 071 Fax: +(40)-1-650
60 59 E-mail: redactia@metalurgia.ro www.metalurgia.ro Readers from abroad can subscribe
through Editura Științifică F.M.R. Contul
EDITURII ȘTIINȚIFICE F.M.R.: Lei: BCIȚ, Sucursala Rosetti,
București Cod IBAN: RO55 CBIT
4260 1037 4300 1000 USD: BCIT
Sucursala rosetti,
București Cod IBAN: RO21 CBIT
4260 1037 4300 2000 Euro: BCIT
Sucursala rosetti,
București Cod IBAN: RO84 CBIT
4260 1037 4300 3000 Banca Comercială Ion Țiriac, ROSETTI BRANCH, Bucharest, Romania Copyright © 2005 editura Științifică F.M.R.-Bucharest,
Romania The copyright of parts from this
publication is allowed with the written agreement
of the editor. The price for annual subscription: USD
100
EURO 120 |
Metalurgia INTERNATIONAL English version, published by romanian metallurgical
foundation Honorary president of scientific publishing house f.m.r. Dr. ec. Lepădatu v. gheorghe
(2005) no.2 romanian metallurgical
foundation Scientific publishing house |
|
romanian metallurgical foundation Scientific publishing house scientific board staff Professor AVRAM NICOLAE Ph. D. professor Costin
Scorțea Ph. D Managing Director: Professor Costin Scorțea Ph.
D. Editor-in-chief: Professor Nicolae
Avram Ph. D. Professor Maria Nicolae Ph. D editorial board: Prof.
dr. ing. bejan Mircea Prof.
dr. ing. bunea Daniel Prof.
dr. ing. cănănău
nicolae Prof.
dr. ing. GEORGETA COȘMELEAȚĂ Prof.
dr. ing. CIUCĂ ION Prof.
dr. ing. gaba aurel Prof.
dr. ing. GĂLUȘCĂ DAN GELU Prof.
dr. ing. hepuț teodor Prof.
dr. ing. IONIȚĂ GHEORGHE Prof.
dr. ing. mănescu tiberiu Conf. univ. dr. ing. TODERIȚA NEMEȘ Prof.
dr. ing. samoilă Corneliu Prof.
dr. ing. SCORȚEA COSTIN Prof.
dr. ing. SIMITI IOAN VIDA Prof. dr. ing. SOFONEA GALAFTION Prof.
dr. ing. Șaban Rami Manager Scientific Publishing
House F.M.R.: eng. Florentina Brândușa Scorțea |
Contents Issn 1582 2214 Bujoreanu
gh.-Leandru, Stanciu Sergiu, Ioniță Iulian, Munteanu Corneliu, Gălușcă
Dan-Gelu: Effects of a α-phase preferred precipitation
during the heating of a Cu-Zn-Al shape memory alloy
...
.
..3 Cojocaru V. Dănuț: Ball-milling
synthesis of nanostructured nanoperm
alloys
..
.
.11 KISS
Imre, MAKSAY Stefan, RATIU Sorin: The
triple correlations theory and the optimal form of molding in the case of the semihard cast nodular
iron rolls hardnesss
.
14 Ana Josan: Determination
of the mechanical and micro-structural characteristics of the adamite-type, hypereutectoid steel of
the rings sampled from cylinders cast at S.C. SIDERURGICA S.A. Hunedoara
...22 Ana Doniga: Recrystallization
influence on the texture and microstructure of the microalloyed 3% Si steels
.
.30 scorȚea Costin : Comparaison entre les solutions
techniques adoptées pour lusine sidérurgique de galatzi, et les solutions aux usines de dunkerque et fos-sur-mer
.36 ? Press release
....
.
............I
- VI ? New books, published by romanian metallurgical foundation..
.
..
VII
- VIII |
abstract
metalurgia International
2/2005
|
D.C.: 621.744; 669.018 Bujoreanu
gh.-Leandru, Stanciu Sergiu, Ioniță Iulian, Munteanu Corneliu, Gălușcă
Dan-Gelu: Effects
of a α-phase preferred precipitation during the heating of a Cu-Zn-Al
shape memory alloy Metalurgia International
(vol. X), no.2, 2005, p. 3 D.C.: 621.771; 669.017 Cojocaru V. Dănuț: Ball-milling synthesis of nanostructured nanoperm alloys Metalurgia International
(vol. X), no.2, 2005, p. 11 Over
the last decade, nanocrystalline materials were investigated for applications
in magnetic devices that require soft magnetic materials (transformers,
inductive devices, etc). The benefits of nanocrystalline alloys stem from
their chemical and structural variations over nanometer scale which are
important for developing optimal magnetic properties. High induction bulk
materials, including NANOPERM-type alloys, were investigated, however less
attention has been paid to the stability of nanostructured materials under
extreme conditions of pressure and temperature. The main aim of the present
work is to study the synthesis of soft-magnetic nanostructured materials.
NANOPERM-type alloy powders were prepared by high-energy ball-milling. The
evolution of crystallinity and grain-size during the ball-milling process was
evaluated using synchrotron radiation X-ray diffraction. D.C.: 669.131.622 Keywords: semihard
cast nodular iron rolls, alloying elements, hardness, molding, mathematical
correlations, graphical addenda KISS Imre, MAKSAY Stefan, RATIU Sorin: The
triple correlations theory and the optimal form of molding in the case of the semihard cast nodular
iron rolls hardnesss Metalurgia International
(vol. X), no.2, 2005, p.14 The
technical conditions, which are imposed to the cast iron rolls in the
exploitation period, are very different and often contradictory. The
obtaining of various physical and mechanical properties in the different
points of the same foundry product meets difficult technological problems in
the industrial condition. This
supposes us to know many technological factors, which lead to this deformation
equipment. The
rolls must present high hardness at the crust of rolls and lower hardness in
the core and on the necks, adequate with the mechanical resistance and in the
high work temperatures. If
in the crust the hardness is assured by the quantities of cementite from the
structure of the irons, the core of the rolls must contain graphite to assure
these properties. One
of the parameters, which determine the structure of the irons destined for
rolls casting, is the chemical composition. |
If
we not respect this composition, which guaranties the exploitation properties
of the each roll in the stand of rolling mill, it will lead to rejection. Alloying
elements have in principle the same influence on structure and properties. This
article explains how the chemical composition, through the main alloying
elements (Ni, Cr, Mo), influencing on a structure and the expected mechanical
properties of the nodular cast irons, and presents also some graphical
addenda. We
suggest a mathematical shaping of the influence of the main alloy elements
over the mechanical characteristics (the hardness on the crust of the rolls)
of this nodular irons, resulting the average values and average square
aberration of the variables HS, and the main alloying elements (Cr, Ni, Mo),
the equations of the hyper surface in the four dimensional space. For
the statistical and mathematical analysis, there were used 23 industrial
cases. D.C.: 621.771 Keywords: Adamit-type steel, ring cutting, hardness,
microstructure Ana
Josan: Determination of the mechanical and micro-structural
characteristics of the adamite-type,
hypereutectoid steel of the rings sampled from cylinders cast at S.C.
SIDERURGICA S.A. Hunedoara Metalurgia International (vol. X), no.2, 2005, p.
22 The
paper introduces the possibilities of determining the material
characteristics of the Adamit-type steel meant for casting hot rolling
cylinders. The experiments have been carried out on 17 test rings cut off the
cylinders that are to be used. We
determined the hardness cross section variations, the traction resistance, as
well as the micro-structural characteristics. D.C.: 620.186 Ana
Doniga : Recrystallization influence on the
texture and microstructure of the microalloyed 3% Si steels Metalurgia International (vol.X), no.2, 2005,
p.30 In
this paper frame work a Nb mycroalloyed silicon steel was made and it was
hot and cold processed in same working condition as an unalloyed steel made
in industrial conditions. The influence of the primary and secondary
annealing and recrystallization conditions on the structure and Goss texture
was studied. It was noted that Nb steel strip shows a
higher level of Goss texture, that means, finally higher magnetically
characteristics as against to unalloyed steel. D.C.: 669. scorȚea Costin : Comparaison entre les solutions techniques adoptées pour lusine sidérurgique
de galatzi, et les solutions
aux usines de dunkerque et fos-sur-mer Metalurgia International (vol.X), no.2, 2005, p.
36 |