Mechanical properties of heat treated iron based compacts
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In this study, powder metal (PM) compacts were prepared by mixing iron powder with 1-6 wt.% ratio of Cu and 0.2-0.8 wt.% ratio of graphite. The 20 different PM compacts compositions were prepared with a 0.8 wt.% ratio of zinc striate as the lubricant. The dimension of compacts were 10 x 10 x 55 mm. All the compacts were pressed at 600 MPa and, sintered at 1120 degrees C for 30 min using a conventional sintering furnace and then boronizing, steaming and carbo-nitriding heat treatments were applied. The results of all compacts for the bending test, microstructure images and HV microhardness results were compared. As a result of the experiments, it was concluded that, the highest bending strength was obtained at carbo-nitrided samples, the highest surface hardness was measured at boronized samples and all these heat treatments increase the densities of iron based samples. (C) 2014 Elsevier Ltd. All rights reserved.