PRODUCTION OF MO-Nİ STEEL BY POWDER METALLURGY WHICH IS USED AS COUPLING MATERIAL
AbstractIn this work, the effect of Mo and Ni (3 wt.) on the microstructures and tensile behaviors of powder metallurgy (PM) steels were investigated. Comparing in terms of mechanical properties, C ratios in Mo-Ni PM steels are kept constant and the effects of Mo and Ni are examined. Before the mixing process, the powders were prepared by weighing on a digital precision scale of 0.0001 g precision. The mixing process was conducted without ball using a Turbula T2F mixer for 1 hour. Having mixed homogeneously, the powders were pressed with cold under 700 MPa unidirectionally with a Hidroliksan press of 96 ton pressure capacity according to ASTM (E8M) standards of powder metal material tension test sample. The pressed samples were sintered at 1400 °C for 1 hour in argon atmosphere. Tensile test was made at 0.5 mm/min crosshead speed with Shimadzu tensile device that has 50 KN capacity. The tensile strength and elongation % of the tensile test samples were determined. After sintering, density (%)were measured. Microstructure examinations were carried out with Nikon Epiphot 200 brand optical microscope. Density of the samples was measured with the density measurement tool according to Archimedes principle. It is clear that the mechanical properties of 3 wt. % Mo and Ni added PM steel is better than that of 0 and 3 wt. % Mo added PM steels.