Abstract

The complicated service conditions of components of steam boilers operating at moderate temperatures (bends of nonheated boiler pipes, drums, etc.) lead in some cases to premature damage in these components. The identification of this damage in metallographic and fractographic investigations is a complicated problem because this type of damage is caused by the combined effect of a number of factors. This problem can be solved efficiently be comparing service failures with those obtained in tests in testing units. However, this method is not as yet used extensively because it is difficult and complicated to reproduce service damage in the laboratory conditions and there is insufficient experience with these experiments.

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