SYMPOSIA PAPER Published: 01 January 1973

Evaluation of Thermal Fatigue Resistance of Metals Using the Fluidized Bed Technique


This paper presents details from the experience gained over the last twelve years with the fluidized bed method of thermal fatigue testing. The use of the fluidized bed is discussed, and comparisons are made with other methods of testing as to advantages and disadvantages. The design and construction of a fluidized bed test facility is described and performance characteristics noted. Configurations that have been used are disks, wedges, and “window” specimens. All of these specimens may be notched. Temperature gradients in the specimens may be controlled by bed temperatures, time of exposure, and fluidization conditions. The window specimen has been used to examine thermal fatigue resistance of welds between the same and dissimilar materials. The changes that occur during thermal cycling and the effects of thermal stresses on tempering and aging mechanisms are discussed. Finally, selection and treatment of materials to minimize thermal fatigue are considered.

Author Information

Howes, MAH
Physical and Ferrous Metallurgy, IIT Research Institute, Chicago, Ill.
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Developed by Committee: E08
Pages: 242–254
DOI: 10.1520/STP38843S
ISBN-EB: 978-0-8031-5576-3
ISBN-13: 978-0-8031-5528-2