Evaluation of Mechanical Properties of Sintered Hot Upset Forged Square Cross Section Bars of Chromium-Molybdenum Low Alloy Steels
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2014, Vol 4, Issue 6
Abstract
Present investigation pertains to evaluate the tensile properties of sintered hot forged and oil quenched and also homogenized, but furnace cooled specimens which were machined from square cross section bars of approximate dimensions of ~13mm x ~13mm x~100±5mm of Fe-0.16%C, Fe-0.16%C-0.7%Mn, Fe-0.16%C-1.0%Cr-0.55%Mo and Fe-0.16%C-2.25Cr-1.05%Mo P/M steels prepared from elemental powders. Green compacts of homogeneously blended powders of all compositions were prepared with initial aspects ratio of 1.34 with diameter being 27.5mm using suitable compaction die set assembly on 1.0MN capacity UTM to a density level of 0.85±0.01 of theoretical employing controlled pressures in the range of 490±10MPa and taking pre – weighed powder blends. All green compacts were protected during sintering by applying thin film of indigenously developed ceramic coating on the entire surfaces. Ceramic coated compacts were sintered in an electric muffle furnace at 1373±10K for a period of 120 minutes. All sintered preforms of each com position were hot forged on a 1.0MN capacity friction screw press to square cross section bars of afore mentioned dimensions. Once the forging operation was completed 10-12 bars were quenched in linseed oil and nearly 12 bars were homogenized at sintering temperature for one hour and then cooled inside the furnace itself. Standard tensile specimens were machined and tested on Hounsfield Tensometer for evaluating tensile properties which were appreciably close to the properties reported in literature for the above steels. Microstructure of specimens containing chromium and molybdenum exhibited few un-dissolved particles along with the presence of fine pores. SEM Fractography revealed mixed mode failure mostly ductile and partly brittle. These steels also exhibited adequate ductility as is exhibited by conventionally produced steels. Thus, this investigation shows the way how to produce high density P/M steels which can be used in structural applications.
Authors and Affiliations
Hemlata Nayak, C. M. Agrawal, K. S. Pandey
Keywords
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