Studies on the Fatigue Strength of Aluminum Coated Steel : 1st Report, The Effect of Aluminum Coating Method on the Fatigue Strength

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Rotating bending fatigue tests were performed on three kinds of aluminum coated steels. The effect of three aluminum coating methods, namely electroplating, hot dip, and spraying on the fatigue strength of the steels were studied. The results obtained are as follows. (1) The effect of electroplating on the fatigue strength of the steel is not recognized at all. But a little effect of the spraying on the fatigue strength is observed. (2) In hot dip aluminum coating of the steels, a decrease of the fatigue strength is observed. This is considered to be due to the formation of cracks in a brittle alloy layer. Such cracks act as shape notches on the surface of steel base. Moreover, the formation of cracks decreases the effective area of specimen whic supports the alternating stress. (3) The addition of 1% beryllium to molten aluminum bath markedly improves the fatigue strength of hot dip materials.
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