Abstract
The variations of cooling stresses in a tungsten target of a medical X-ray tube which fractured as the result of overloading have produced within a distance of 6 mm areas in which: (a) cooling from the recrystallisation temperature has caused the fracture of a large number of grains into crystallites; (b) cooling from a temperature in excess of the re-crystallisation temperature has caused the fracture of larger grains into smaller ones with large differences of orientation; (c) the fracture of a large grain into crystallites orientated about a cylindrical axis has occurred. A secondary fragmentation of some of the crystallites has taken place.
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