http://arthra.ugal.ro/handle/20.500.14043/25490 2026-04-05T22:02:06Z http://arthra.ugal.ro/handle/20.500.14043/25511 Aspects of Nitrated Layer Structure for Some Types of Austenite Stainless Steel Dima, Ovidiu; Levcovici, Sanda; Gheorghieș, Constantin The analysis of nitrated layer diffractograms and the structure marked out the presence of complex nitrides combinations layer for all types of steel except for code 6 steel type 2CuMoNiCr200 which because of the very high index of austenite stability, 29.9, presented a layer made of nitrogen solid connate solution in austenite. In the case of stainless austenite steel types nitrogen diffusion and, consequently nitrated layer formation depends on the concentration of alloying elements in steel, on austenite stability indices. Code 2 and code 3 steel types that have the smallest stability indices have the thickest layer and are followed by code 3 and code 4 steel types. On the fifth place is code 1 steel type which has a thinner layer, approx. 21 jam and on the last place there is code 6 steel type that, as it was shown, does not form a nitrides layer. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science ISSN 1453 – 083X. N0. 1 – 2006 2006-01-01T00:00:00Z http://arthra.ugal.ro/handle/20.500.14043/25510 The Laboratory Experiments Regarding the Intercritical Heat Treatments Applied an the Low-Alloyed Steel Vasilescu, Elisabeta; Neacșu, Marian The paper presents the research results regarding the influence of the intercritical thermal treatments carried out on some hypoeutectoid steel castings. The purpose of this research at the laboratory scale is to measure the effect of the thermal treatment which precedes the intercritical thermal treatment as well as to establish the optimum experimental variant in order to replace the classical thermal treatments. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science ISSN 1453 – 083X. N0. 1 – 2006 2006-01-01T00:00:00Z http://arthra.ugal.ro/handle/20.500.14043/25509 Experimental Results at Modelling of the Flow and Deformation Fields at the Profiles Rolling Cănănău, Nicolae; Petrea, Ionel This paper presents the results for modeling of the rolling process based at the deformable continuous medium mechanics, the theory of field lines. The rolling of the profiles and plates may be evaluated as the plane strain state process. Using the equations of the continuous medium and the initial conditions and the limits conditions we solved the speed field, the strain rate field, the strain field. Applying an adequate computation program we obtained the values of the field factors of modeling process. The results are showed into this paper The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science ISSN 1453 – 083X. N0. 1 – 2006 2006-01-01T00:00:00Z http://arthra.ugal.ro/handle/20.500.14043/25508 Selective Organic Reactive for Determination of Several Heavy Metals from Different Materials Mitoșeriu, Olga; Levcovici, Dan T.; Filip, Gabriela The research regarding the synthesis and characterization of tiobis-β- naphthol have established that it can be used as an efficient analytical reactive for separating through extraction the heavy metals in watery environments. These studies have been presented in the CALIST program. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science ISSN 1453 – 083X. N0. 1 – 2006 2006-01-01T00:00:00Z