1958 Volume 22 Issue 3 Pages 132-136
A series of experiments were carried out about the corrosion-fatigue properties in a 3%NaCl aq. solution and the notched-fatigue properties (theoretical stress concentration 3.15) of some annealed brasses and condenser tube alloys with a rotating-beam fatigue tester. The effects of aluminum contents on the fatigue properties of aluminum brass were also studied with a Schenck’s plane-bending fatigue tester. The relations between the fatigue strength at 108 cycles and zinc or zinc equivalents of the specimens are shown in Fig. 6. The increases of zinc or zinc equivalents improve the mechanical properties and the unnotched-fatigue strength in air, but excessive increments of these contents will not effect any improvement on the corrosion-fatigue and the notched-fatigue resistances. The corrosion-fatigue strength of copper-zinc binary alloy increases with zinc contents and then decreases with a rise over 20 per cent of zinc contents. In the case of aluminum brass, Albrac alloy, Admiralty metal and arsenical Admiralty metal, the materials with rich zinc equivalent contents showed lower notched-fatigue and corrosion-fatigue strengths than that the materials poor in zinc equivalent contents. These results show that the corrosion-fatigue strength is related to the notched-fatigue strength.