http://arthra.ugal.ro/handle/20.500.14043/25969 2026-04-16T14:06:30Z http://arthra.ugal.ro/handle/20.500.14043/25981 Research on the Influence of the Complementary Phase Percentange on the Properties of Copper-Based Composites Boiciuc, Simona; Alexandru, Petrică The article presents the method to obtain copper matrix composite with Cu- Al-Fe alloy particles as complementary phase. The samples were obtained by powder metallurgy methods using different percentages of complementary phase: 10, 20, 30, 40, 50% Cu-Al-Fe of average size of 100 m. After cold pressing at a pressure of 863 MPa samples were sintered at 910 C for 90 minutes. Characterization of the samples was focused on the microstructural aspects and abrasive wear behavior. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science N0. 3 – 2014, ISSN 1453 – 083X 2014-01-01T00:00:00Z http://arthra.ugal.ro/handle/20.500.14043/25980 Correlation Between the Properties of Old Slags and the Recycling Solutions Ciocan, Anişoara; Potecaşu, Florentina; Radu, Tamara The blast furnace and basic oxygen furnace route of steel making (from iron ores and coke to steel) or the so called integrated steel production generates simultaneously solid waste products. The slag is predominant, consisting of blast furnace (BF) slag and basic oxygen furnace (BOF) slag. The major share of this has been stored with no control near industrial area forming a metallurgical waste dump. For solving the problems of metallurgical residues and wastes stored in the old dump, the authority develops an appropriate environment policy for a proper management. The landfilled slag is exploited under supervision. The paper presents the sustainable recycling solutions applied in correlation with the properties of old slags. The performance of recycling solutions for each slag type is discussed according to the chemical composition and structure. Specific cooling conditions (as well as the chemical composition) of slag dumped under the action of variable weather conditions are analysed. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science N0. 3 – 2014, ISSN 1453 – 083X 2014-01-01T00:00:00Z http://arthra.ugal.ro/handle/20.500.14043/25979 The Evolution of the Characteristics of Mechanical Resistance for the Nitro-Carburized Treated Steel, After Thermo-Magnetic Treatment Papadatu, Carmen Penelopi The aim of the research was to study the evolution of the characteristics of mechanical resistance for one type of steel. The material was subjected to the thermo-chemical (nitro-carburized treatment in plasma) treatment applied after thermo-magnetic treatments. The structural and diffractometric aspects of the superficial layers of the steel are studied after the wear process, using an Amsler type machine, taking two sliding degrees at different contact pressures and testing in time. The tests were done to detect the sustainability to the material, the evolution of the superficial layer characteristics through different tests and to establish the influence of these thermo-magnetic treatments regimes. The magnetic field modifies the grain size in the material structure. It was obtained a small grain size in the middle of the sample and the orientation of these grains is in the same direction with the lines of the magnetic field. It was made a balance sheet between classic treatment and unconventional (thermo-magnetic) treatment. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science N0. 3 – 2014, ISSN 1453 – 083X 2014-01-01T00:00:00Z http://arthra.ugal.ro/handle/20.500.14043/25978 Research on the Work Place Security and Environmental Factors Affected by Lathe Work Dragomir, Georgeta; Bordei, Marian; Dragomir, Ştefan Most work place risks are spatially and temporally determined, so a critical early need is to establish the risk of what (is happening) to whom (which part of the environment is affected), where (location) and when (in time). Environmental factors that can be damaged are: soil, water, air, noise, biodiversity, landscape and human settlement. Formulating the problem in clear and unambiguous terms will assist in selecting the level and types of assessment methodology used and will improve, in the context of sustainable development, the risk management decision. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science N0. 3– 2014, ISSN 1453 – 083X 2014-01-01T00:00:00Z