Abstract
It is well known that surface conditions have much influence on the fatigue strength of steel. This fact cannot be too much emphasized for springs, because nearly all springs have an as-rolled surface condition and function under repeated stress.The author has investigated the relation between the thickness of decarburized layer and reduction in fatigue strength of Si-Mn spring steel.The results obtained are as follows:(1) Reduction in fatigue strength is not proportional to the thickness of decarburized layer. Only slight amount of decarburized layer causes sudden reduction in fatigue strength to a certain value and no distinct reduction is observed even when its thickness increases further.(2) Fatigue strength of this steel when decarburized in surface is 50 to 60 per cent of nondecarburized steel.(3) This reduction is considered to due to notches which break out in the decarburized layer.
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