Studies Regarding the Influence of Boron Addition on the Hardness and Friction Coefficient of the Mn, Mo and Cr Ecological Alloyed Sintered Steels
Journal Title: RECENT - Year 2011, Vol 12, Issue 33
Abstract
In this paper are presented the experimental results regarding the elaboration of the Fe-Mn-Mo-Cr-B-Graphite and Fe-Mn-Mo-Cr-Graphite ecological alloyed sintered steels. There have been produced mixes containing 3% Mn, 1%Mo, 1.5%Cr, 0.5%B, 0.45Grafit and Fe which were exposed to the process of Mechanical Alloying (MA) for 20, 40, and 60 hours. The mixtures were pressed in a cylindrical die at three pressures (600,700 and 800 MPa), after that the green densities were calculated. The compacts were sintered in a furnace with protective atmosphere (Ar) at different temperatures (1050, 1100 and 1150 °C) and the dwell time was 120 minutes. The samples obtained after sintering treatment were investigated by optical and electronic microscopy. The mechanical properties such as hardness and friction coefficient were studied too. It is observed that high values of hardness (HV0.2) and friction coefficient μ = 0.158 were obtained for the Fe-Mn-Mo-Cr-B-Graphite ecological steels obtained after 60 h of mechanically alloying, pressed at 800 MPa and sintered at 1150 [sup]o[/sup]C.
Authors and Affiliations
Ionela BUCŞE, Adela IONESCU, Claudiu NICOLICESCU, Jeni GHERCIOIU
Keywords
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