Redacţia, administraţia: Calea Griviţei, nr.83, Sector 1, O.P. 12, Cod 010705, Bucureşti

Tel.: 004 021/650 60 59

GSM: 0722 665 071; 0724 537 051

Fax: 004 021/650 60 59,

E-mail: redactia@metalurgia.ro; www.metalurgia.ro

Contul EDITURII ŞTIINŢIFICE F.M.R.:

Lei: BCIŢ, Sucursala Rosetti, Bucureşti

Cod IBAN: RO55 CBIT 4260 1037 4300 1000

USD: BCIT Sucursala rosetti, Bucureşti

Cod IBAN: RO21 CBIT 4260 1037 4300 2000

Euro: BCIT Sucursala rosetti, Bucureşti

Cod IBAN: RO84 CBIT 4260 1037 4300 3000

Costul unui abonament: lei 4 800 000

Nici un material din această revistă nu poate fi reprodus, difuzat sau folosit în orice alt mod decât cu aprobarea scrisă a editorului.

Manuscrisele şi documentele nepublicate (fotografii, pliante, cărţi) expediate pe adresa redacţiei, din iniţiativa autorilor, nu se restituie.

Potrivit art.206 CP, responsabilitatea juridică pentru conţinutul articolului aparţine autorului. De asemenea, în cazul unor agenţi de presă şi personalităţi citate, responsabilitatea juridică le aparţine.

Reproducerea de părţi din această revistă este permisă cu acordul scris al editorului

The copyright of parts from this publication is allowed with the written agreement of the editor

Metalurgia

revistă fondată în 1948

Revistă editată de editura ştiinţifică f.m.r.

preşedintele onorific al

editurii ştiinţifice f.m.r.

Dr. Ec. Lepădatu V.Gheorghe

Nr.11

septembrie

2004

Preşedinte al colegiului executiv de redacţie

Prof. dr. ing. COSTIN SCORŢEA

colegiul onorific

(în ordine alfabetică)

I.Ågren (Suedia), dieter ameling (GERMANIA),ionel borş,

marius bordea, cornel chiriac, radu constantin, gheorghe dobra, constantin dumitrescu, , ,R. S. HOUK (S.U.A.),

T. Y. Hsu (China), romulus ioan,

christopher lawson (danemarca), y. matsubara (Japonia),

petre moldovan, avram nicolae, D. R. J. OWEN (SWANSEA, UK),

nicu radu, gheorghe roşescu (grecia),

roxana ruxandra (california), laurenţie sofroni,

Jean-marc saiter (franţa), paul tudor, vasile văzdăuţeanu

preşedinTii colegiilor de redacţie

Prof. dr. ing. AVRAM NICOLAE

Prof. dr. ing. COSTIN SCORŢEA

Corpul referenţilor ştiinţifici

Prof. dr. ing. anişoara ciocan, Prof. dr. ing. Aurel Crişan, Prof. dr. ing. Nicolae constantin, Prof. dr. ing. Emil Nagy,

Prof. dr. ing. MARIA NICOLAE, Conf. dr. ing. Tamara radu, Prof. dr. ing. DOINA RĂDUCANU,

Conf. dr. ing. AUGUSTIN SEMENESCU,

Prof. dr. ing. PETRICĂ VIZUREANU

Colegiul executiv

Prof. dr. ing. Mircea bejan

Prof. dr. ing. Daniel bunea

Prof. dr. ing. nicolae cănănău

Prof. dr. ing. GEORGETA COŞMELEAŢĂ

Prof. dr. ing. ION CIUCĂ

Prof. dr. ing. aurel gaba

Prof. dr. ing. DAN GELU

Prof. dr. ing. teodor hepuţ

Prof. dr. ing. GHEORGHE IONIŢĂ

Prof. dr. ing. tiberiu mănescu

Prof. dr. ing. Corneliu samoilă

Prof. dr. ing. COSTIN SCORŢEA

Prof. dr. ing. IOAN VIDA SIMITI

Prof. dr. ing. Rami Şaban

Director General Editura Ştiinţifică F.M.R.

Redactor Şef. Ing. BRÂNDUŞA FLORENTINA SCORŢEA

Asistent Editura Ştiinţifică F.M.R.

Procesare -tehnoredactare:

ANCA ION

SUMAR ISSN 0461-9579

Tudor Paul, Nicolae Avram: Fierul vechi – deşeu metalic sau materie primă……………………………………………………………………………5

Doina Răducanu, Lucia Angelescu, Cincă Ion, Cojocaru Dănuţ: Comportarea la deformare plastică a titanului comercial utilizat pentru implanturi dentare. Partea a II-a. Deformarea plastică la rece……...……10

Tamara Radu, Olga Mitoşeriu, Maria Popescu: Cromatarea şi fosfatarea acoperirilor cu Zinc şi aliaje de Zinc………………………………………..16

Adriana Neag, Monica Sas-Boca: Aspecte ale deformării în stare semisolidă………………………………………………………………….….22

Ana-Luciana Rus: Superplasticitatea aliajelor de titan………………………….26

Roxana Nedelcu: Aspecte privind optimizarea alegerii parametrilor tehnologici la călirea cu radiaţie laser…………………………………………………....32

Ermina Ţapu, Nicoleta-liliana frăţilă: Cercetări privind influenţa geometriei structurii asupra performanţelor materialelor……………..….36

+ Informaţii din metalurgia mondială……………………..…..………………….………….I

+ Ştiri………………………………..……………....…………...…………...……….…...…III

+ Semnalări………..……………….……….…….…………………………..…….…....…..IV

+ Noutăţi din trecut……………………………………….……………………...………….VI

+ Aniversări siderurgice. …….……………………………………………….….…....….VIII

+ Evenimente internaţionale …...………...………..………...…………….….…X

ª Congrese- târguri-expoziţii-simpozioane-conferinţe-seminarii………….....….X

+ Producţia de piese turnate în anul 2002……………………..……………...............…..XII

+ Cărţi noi…………...…......................................................................................................XIII

+ Cărţi apărute la Editura Ştiinţifică F.M.R…………………….…....…………XV-XVIII

+ Revista Revistelor …..…………………………………..………9, 15, 21, 31, VII, IX, XIV

abstract metalurgia 11/2004

D.C.: 574; 669.

Paul Tudor, Avram Nicolae: Scrap – metallic waste or raw material

Metalurgia (56) 2004, nr.11, p.5

The increasing importance of scrap on a restrictive market induces a very important question: how should be scrap considered? As a raw material or recyclable by-product? The authors try to demonstrate scrap must be considerat as raw material, which represents a reason to important quality modifications in the areas of collecting, distribution and utilisation of this material.

D.C.: 539.374

Doina Răducanu, Lucia Angelescu, Ion Cincă, Dănuţ Cojocaru: Plastic Deformation Behaviour of Commercially Titanium used for Dental Implants. Part II. Cold plastic deformation

Metalurgia (56) 2004, nr.11, p.10

In previous part of this article, effects of hot plastic deformation on elastic component of commercially titanium were presented. This time, the researches are focused on the effects of cold plastic deformation on elastic component.

The experiments are based on the micromechanics behaviour when a rigid indentor penetrates a flat surface of a material which has the ability to deform elastic or plastic. The deformation was performed by micromechanical testing, using an indentation device which can work with spherical indentors.

Data about the penetration depth can be used to express the quantum of elastic deformation.

D.C.: 669.58;

Tamara Radu, Olga Mitoşeriu, Maria Popescu: Zn and Zn alloys coating chromatizing and phosphatizing

Metalurgia (56) 2004, nr.11, p.16

The researches were focused on the identification of some passivation procedures aimed at increasing corrosion resistance of coatings of the zinc-iron alloys obtained by diffusion white improving their aspect as well. The experiments lead to three optimal solutions of passivation for zinc-iron alloys coatings with 7-15%Fe.

D.C.: 539.374

Keywords: rheology, structure, viscosity, semi-solid

Adriana Neag, Monica Sas-Boca: Aspects of Semi-Solid Deformations

Metalurgia (56) 2004, nr.11, p.22

Growing demands in recent years, for near-net-shape manufacture and increasing production within the automotive industry, improved part quality, reduced

tolerances and higher production output are gaining more importance within the “forming industry”.

D.C.: 669.2/.8.018; 669.295

Keywords: superplasticity, grain refinement, strain rate sensitivity, strain rate, alpha-beta titanium alloys, fully beta titanium alloys

Ana- Luciana Rus: Superplasticity of titanium alloys

Metalurgia (56) 2004, nr.11, p.26

Titanium alloys were among the first commercial alloys to be recognized as having an interesting degree of superplasticity. Many commercial titanium alloys are designed to have a two-phase alpha-beta microstructure, t give the desired combination of mechanical properties, and it is precisely this two-phase microstructure that frequently led to a fine stable grain size in some of the first superplastic alloys to be studied. The commercial availability of superplastic titanium alloys, without the aid of special processing, has led to the early application of these materials in aerospace structures. The paper reviews briefly the titanium alloys, the superplastic properties of these and the methods for grain refinement.

D.C.: 621.785.6

Roxana Nedelcu: Aspects regarding optimization of technological parameters for laser radiation quenching

Metalurgia (56) 2004, nr.11, p.32

The main results presented in the paper concerning the interaction process studies for carbon steel laser hardening. The basic characteristic of laser radiation action on surfaces consist in local nature of temperature source that allow a hard thermal duty, high speed of heating and cooling. Due to diversity and complexity of the processes involved in the effect of laser radiation, its results are not strictly determined by the parameters having the most straight-tha type of target material and irradiation regime.

D.C.: 621.382;621.315.592

Ermina Ţapu, Nicoleta-liliana frăţilă: Researches Regarding the Influence of the Geometrical Structure on the Materials Performances

Metalurgia (56) 2004, nr.11, p.36

In the present paper it is described the methodology of obtaining the semiconductor materials by modifying the germanium crystal structure. We started from the presumption that in the semiconductor the electrons could stay only in certain allowed areas, separated by interdicted areas, and because for the conduction phenomenon the only interesting areas are the high energy, allowed once.