Abstract
In order to elucidate the failure mode, the load carrying capacity and the relation between tooth profile change and dynamic performance in the fatigue process of carbonitrided steel gears, a carbonitrided chromium steel gear with a shallow hardened depth was fatigue-tested using a power circulating gear testing machine here. The failure modes of this carbonitrided gear were spalling on the tooth surface and tooth breakage due to spalling near the pitch point. The fatigue strength of this carbonitrided gear agreed almost with the lower limit of that of case-hardened gears and the upper limit of that of nitrided gears. The changes in the tooth profile and the dynamic characteristics during the fatigue process of this gear were slight.
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