Abstract
The goal of this article is to study the effect of the rolling direction on the fatigue resistance of electrical steel 3413 (All-Union State Standard 21 427.1-75), which contains 2.8-3.8% carbon. Specimens were annealed after bending, by the standard technology: heating to 1053/sup 0/K, holding for 2 h, further heating to 1153/sup 0/K, holding for 6 h, cooling (at 373/sup 0/K/h) to 873/sup 0/K, then cooling at 423/sup 0/K/h. Also, fatigue tests were conducted on a high-frequency magnetostriction unit of the resonance type. The first sign of speciman fracture was a reduction in the frequency of the steady-state resonance vibrations, which was followed by rapid crack propagation. It can be seen that the endurance confidence intervals for the specimens prepared along the rolling direction are considerably narrower than those for the speciman prepared across the rolling direction. Allowing for the fact that the safe life of the teeth of tubogenerator segments should exceed 10/sup 8/ load cycles, it can be concluded on the basis of the test data that the rolling direction does not significantly affect the endurance limit of stator segments.
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