STP520

    Correlation of Substructure with the Elevated Temperature Low-Cycle Fatigue of AISI 304 and 316 Stainless Steels

    Published: Jan 1973


      Format Pages Price  
    PDF (540K) 11 $25   ADD TO CART
    Complete Source PDF (21M) 11 $166   ADD TO CART


    Abstract

    The dislocation substructure of AISI 304 and 316 stainless steels resulting from high strain fatigue for various strain rates at temperatures ranging from 430 to 816 C has been evaluated by transmission electron microscopy. The substructure is characterized quantitatively and correlated with the observed mechanical behavior. Dislocation cells or subgrains were observed for all test conditions with exception of one test where failure occurred in the high-cycle range. These results suggest that a change in deformation mechanisms appear to occur between 650 and 816 C. The Hollomon strain hardening equation is written in terms of the dislocation cell size for both monotonic and cyclic loading predicting higher strengths and strain hardening capabilities could be effected through cell size refinement.

    Keywords:

    thermal fatigue, stainless steels, dislocations (materials), strains, intergranular corrosion, substructures, breeder reactors


    Author Information:

    Challenger, KD
    Materials development engineer, General Electric Co., San Jose, Calif.

    Moteff, J
    Associate professor of Materials Science, University of Cincinnati, Cincinnati, Ohio


    Paper ID: STP38830S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP38830S


    CrossRef ASTM International is a member of CrossRef.