The objective of the present paper is to evaluate the fatigue life of nodular cast iron EN-GJS-
500-7, used for railway brake discs. Tension and low-cycle fatigue properties were examined
at room temperature (RT), 300 C and 400 C. Microstructure of the material was
documented at RT and 400 C. Tensile stress–strain curves, cyclic hardening/softening
curves, cyclic stress–strain curves, stress–strain hysteresis loops and fatigue life curves
were obtained for all temperatures. Young’s modulus remained quite temperature stable,
while proof stress and ultimate tensile strength decreased with increasing temperature.
Fatigue life decreased for around 50% at 300 C, while at 400 C samples endured to only
10% of strain reversals of those at RT.
The objective of the present paper is to evaluate the fatigue life of nodular cast iron EN-GJS-500-7, used for railway brake discs. Tension and low-cycle fatigue properties were examinedat room temperature (RT), 300 C and 400 C. Microstructure of the material wasdocumented at RT and 400 C. Tensile stress–strain curves, cyclic hardening/softeningcurves, cyclic stress–strain curves, stress–strain hysteresis loops and fatigue life curveswere obtained for all temperatures. Young’s modulus remained quite temperature stable,while proof stress and ultimate tensile strength decreased with increasing temperature.Fatigue life decreased for around 50% at 300 C, while at 400 C samples endured to only10% of strain reversals of those at RT.
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