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Abstract
The fatigue properties of connecting rods made by the powder-forging process have been studied. Plain iron powder was used in their production and the carbon content adjusted to ∼0·45% by addition of graphite. Heat-treatment raised the strength to ∼700–850 N/mm2. Fatigue performance under alternating tensile and compressive stress was investigated using a ‘push/pull’-type machine, standard drop-forged rods being tested for comparison. In addition, tests were made on parallel sided test pieces of forged iron-carbon powder and En 15 wrought bar stock.
The endurance limits of the powder-forged rods were superior to those of the drop-forged rods although the results for the latter showed considerable scatter. However, the fatigue performance of polished test pieces showed wrought steel to be slightly the better. Reasons for the differences are discussed. A low-alloy steel of higher fatigue performance is under development specifically for connecting-rod application.
Notes
* Manuscript received 9 July 1973. Contribution to a Symposium on ‘PM Alloys and Properties’, to be held in Eastbourne on 19–21 November 1973.