The reversible bending of certain carbon-molybdenum steam turbine shafts is shown to be caused by expansion coefficient differences existing in the steel from which the shafts were made. This difference is a function of the heat treatment of the steel and it is shown that the magnitude required could be obtained in shafts of the size considered by faulty normalizing conditions. A defective shaft has been cured by a second normalizing treatment in which the uniformity of the austenitizing temperature was improved. The modifications of the expansion characteristics of this steel are associated with different carbide structures.
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