STP520

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

    Published: Jan 1973


      Format Pages Price  
    PDF Version (504K) 13 $25   ADD TO CART
    Complete Source PDF (21M) 13 $166   ADD TO CART


    Abstract

    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.

    Keywords:

    fluidized bed processors, fatigue (materials), failure, cracking (fracturing), crack propagation, crack initiation, plastic deformation, coatings, stress concentration, thermal fatigue


    Author Information:

    Howes, MAH
    Manager, Physical and Ferrous Metallurgy, IIT Research Institute, Chicago, Ill.


    Paper ID: STP38843S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP38843S


    CrossRef ASTM International is a member of CrossRef.