Abstract

The effect of carburizing on fatigue behaviour of smooth and notched specimens and corrosion fatigue behaviour was studied in a type 316 austenitic stainless steel. The fatigue strength of the smooth specimens was considerably increased by carburizing and the specimens with a thick case exhibited longer fatigue lives than the specimens with a thin case. The fatigue strength of the notched specimens was also increased by carburizing and the extent of increase in fatigue strength decreased with increasing stress concentration factor and then saturated. A slight increase in notch sensitivity by carburizing was seen. In 3%NaCl aqueous solution, the carburized smooth specimens showed no reduction in fatigue strength, indicating the excellent corrosion resistance of the carburized case.

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