EFFECT OF COLD SWAGING ON THE MECHANICAL AND MICROSTRUCTURE CHARACTERISTICS OF TUNGSTEN HEAVY ALLOY

R.Osama, A.S.abdalla, W.M.Elthalabawy, G.M.Abdo, M.T.Sallam

Abstract: In this experimental investigation, the post sintering mechanical treatment was implemented by cold swaging the produced tungsten alloy rods with composition (90W-7Ni-3Fe %wt) by cold isostatic press with 300 MPa, and appling different reductions of cross sectional area varying from 10% up to 50%. On the mechanical and microstructure properties of the tungsten heavy all oy (89.97W-7Ni-3Fe-0.03 Y2O3 %wt). Elemental powders were mixed for 120 min. Green compacted by cold isostatic press with 300 MPa, and Finally the specimens were sintered at 1480ºC for 90 min under vacuum atmosphere. It was found that the ultimate tensile strength and hardness were remarkably increased by about 39% and 45% respectively, by the application of 50% area reduction by swaging, relative to the sintered specimens. On the other hand, ductility and impact resistance were deeply decreased by about 75% and 53% respectively, by also, the application of 50% area reduction by swaging.

Keywords: Cold Swaging, Liquid Phase Sintering, Tungsten Heavy Alloy, Powder Metallurgy

DOI: https://doi.org/10.15623/ijret.2016.0504060