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D.C.: 574

Avram Nicolae, Maria Nicolae, Cristian Predescu: Consideration on the “energy-metallurgy” relationship adjustment to the principles of the sustainable development concept

Metalurgia International (vol.IX), no.4, 2004, p.3

D.C.: 621-412

Vasile Caţarschi: Contribution considering the computer designed technologies for steel ingots heating, in “INCFOR” programs

Metalurgia International (vol.IX), no.4, 2004, p. 8

This work presents a number of seven types of technologies for manufactured cylindrical steel ingots heating computer designed. These technologies include: the case of carbon steel cold ingots; steel low allied or high allied; the case of semi-cold ingots; the case of semi-heated ingots and the case of warm ingots and they are part of the ”INCFOR” package of programs.

There are also presented both the input data for the program and output data showed on the heating diagrams, for each technology.

D.C.:621-771.06

Teodor Vasiu: Considerations on the role of the oxide layer on the dry friction of mild steels at relatively high temperatures and speeds

Metalurgia International (vol.IX), no.4, 2004, p. 14

The paper tries to explain the tribologic phenomena that appear at the guideway-billet interface during the hot rolling process. The attention is focused onto the iron oxides whose nature and rates influence considerably the wear of the rolling mill guides.

D.C.: 620.179.16

Marian Bordei, Aurel Ciurea: Experiments regarding the improvements of the continuous casting semifinished quality by using the air-fog process at the secondary cooling

Metalurgia International (vol.IX), no.4, 2004, p. 18

The cooling process by water atomizing consists in the splashing of the semifinished surface with mixed water-compressed-airjets, mixture where water is slightly sprayed and uniformy dispersed.

This process was quickly spread as a result of the special techo-economical efficiency, especially from a point of view of the quality improvement.

D.C.: 669.056.9

Tamara Radu, Olga Mitoseriu, Lucica Balint: Studies on Zn-Fe Alloy Electrodeposition on Steel support

Metalurgia International (vol.IX), no.4, 2004, p.23

The electrochemical deposition of metal alloys is a technique which enables application of thin alloy coatings featuring higher anticorrosion properties then the base metal.

In the last decodes an increasing interest has been shown to ward the Zn-Fe alloy coating for the protection of the steel bars employed in the automotive industry.

These   coatings   are   highly   corrosion resistant can be welded

cosily and do not exfoliate when subject to machining.

For Zn-Fe alloy electrodeposition, use was made of chloride- and sulphide / based salts with additives which increase the electrolyte conductivity, shielding of Fe³⁺ ions, as well as buffer substances. In order to obtain thin layers of known compositions, the Fe ²⁺/Zn ²⁺ mass ratio in solution is changed do that the total amount of Fe ²⁺ + Zn²⁺ remains constant.

 D.C.: 621.771.

Stela Constantinescu, Tamara Radu: The effect of the heat treatment parameters on the structure and properties of the thick plates made from steel X60

Metalurgia International (vol.IX), no.4, 2004, p. 28

The researches coined out to determine the effect of the heating temperature for macrolifing on both structure and properties of thick x 6 steel plates lead to interesting findings related to:

-  the microstructure (fig.1);                 

-  the mechanical properties, R_m (fig.2);      

-  the normedifing technological parameters                                       

D.C.: 669.018.25

Lucica Balint, Simion Balint, Tamara Radu: Research on the Thin films Composite with Soft Magnetic Properties

Metalurgia International (vol.IX), no.4, 2004, p. 33

Composite material presenting in this paper consist of a cobalt matrix in which case particles of ferrotitan are dispersed. Composite materials can be deposited on metallic support through electrodeposition procedure. After taking away the support, succeeded a thermal treats in argon and hydrogen atmosphere at 200⁰C, 350⁰C, 1050⁰C, 1150⁰C temperatures. The material obtained is a composite film with special properties and analysed him the leaf ferromagnetic properties: remanent induction, saturation induction and the coercitive field intensity.

D.C.: 621.778

Key words: dimensional precision, dieless drawing , “mechanical parameters, thermal parameters

Mariana Pop: Some aspects regarding the dimensional precision  in dieless drawing

Metalurgia International (vol.IX), no.4, 2004, p. 38

Dieless drawing of wires and bars and dieless banding of non circular pipes are two non conventional processes of plastic deformation of metals. Both of them are incremental processes of deformation where the deformation stress, power and energy consumed are lower then in the classical processes, where the deformation take place in the whole volume of material. These processes use for produce the local deformation a heating-cooling device. To cause necking the semiproduct is locally heated and to stop further deformation the necked part is rapidly cooled.

Because no die is present in the processes is very important to obtain an acceptable value of dimensional and shape precision of the products.

The aim of this paper is to present the main factors and their influence on the dimensional and shape precision of drawn and bend products.