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218 Marian Teodor Popescu et al. These observations have permitted the surfaces wear proceeding knowledge, the confirmation of the detachable particules presence or absence and the wear surface dimension. In order to compute the wear brought during the test, the topographic characterization of the surface was used. This characterization was made by interferometry with white light VEECO NT 1100 on a disc portion. The device permitts the surfaces visualization in 2 or 3 D and gives the posibility of assesing the material volumes set on one side and the other from a reference plain (see fig. 5 and Table 5). Nr. Wear volume (net missing volume) μm 3 Fig, 5 Table 5 Wear values Damage volume (total displaced volume) μm 3 Width of the surface μm 1 -809652 112703056 2,40E+03 2 -896144 109160720 2,40E+03 3 -957504 141512048 2,40E+03 4 -687784 110011512 2,40E+03 5 -819720 110514248 2,40E+03 Total -4170804 583901584 ------- Average -834161 116780316,8 2.0E+03 Total wear volume µM3 -2.95E+07 Wear ratio (µm 3 .N -1 .m -1 ) -1.22E+03 Total damage volume µm 3 4.13E+09 Damage ratio (µm 3 .N -1 .m -1 ) 171437.8707
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 219 4. Conclusions 1. At the beginning of the test, with the low speed, the friction quotient tends to increase from a low value to a maximum value of 0,58. 2. The speed increasing (0.25; 0.5m/s), the friction quotient increases with a variation between 0.9 and 0.56; at the speed of 0.75; 1; 1.25 and 1.5 m/s the friction quotient stabilises at an average value of 0.62, with oscillations around 0,65. 3. In the same test conditions but with a temperature of 400°C, the average value of the friction quotient was 0.56. REFERENCES Adamou A.S., Thèse de l’Institut National Polytechnique de Toulouse, France, 2005. Dalverny D., Thèse de l’Universitè de Bordeaux, France, 1998 Denape J., Introduction a la Triboligie. Frottement et usure des Materiaux. ENI Tarbes (2008-2009). Popa N., et al., Elemente de Tribologie. Ed. Univ. Piteşti, 2007. Popescu M.T., Alexis J., Recherches concernant le comportement des aciers revêtus au frottement sec et à haute temperature. Ingineria Automobilului, 14 (2010). Popescu M.T., Popa N., Dobrescu R.N., Denape J., Onescu C., The Rough Chromates Steel XC45 Wear Behaviour at Dry Friction and High Temperature. Proceedings of the 7th BALKANTRIB’11 International Conference on Tribology, Thessaloniky, Grecce, 3-5 oct 2011, pp. 81-87. CONSIDERAŢII PRIVIND COMPORTAREA OŢELULUI XC45 LA FRECARE USCATĂ LA TEMPERATURA DE 80 0 C (Rezumat) Una din tehnologiile de modificare a proprietăţilor mecanice ale materialelor este şi cromarea dură. Deoarece se obţin avantaje cu acest procedeu s-a utilizat cromarea dură a oţelului XC45 pentru a se obţine şi proprietăţi tribologice bune. Pentru obţinerea de date privind comportarea la frecare uscată s-a utilizat un tribometru pion-disc. Rezultatele experimentale şi concluziile sunt prezentate în această lucrare.
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