Investigation of The Effect of Ball Diameter on Tensile Strength of Nonalloyed Powder Metallurgy Steels in Mechanical Alloying
Mehmet Akif Erden Selim Erman Harun ÇUĞ
AbstractIn this study, a mixture of unalloyed steel material in the desired composition via powder metallurgy method is obtained by adding 0.5% by weight of graphite element in Fe matrix. The powders obtained were mixed by using a 4, 5 and 6 mm ball in the mechanical mixing device and the mixture was mixed with powder and ball ratio 1/10 for 1 hour. Powders obtained after mixing were squeezed at pressures of 700 MPa at 1350⁰C sintering temperature in 1 hour in the molds designed as tensile specimens. The particle size of the produced steels and the distribution of the phases were determined by optical microscope. After microstructure analysis, tensile test was applied to steel samples prepared in tensile specimen dimensions. The elongation, yield-tensile strength of the samples are explained depending on the ball diameter. As a result, steel samples with a ball diameter of 5 mm exhibited the highest yield and tensile strength.