STP1186

    Thermomechanical Fatigue of the Austenitic Stainless Steel AISI 304L

    Published: Jan 1993


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    Abstract

    The isothermal and thermomechanical fatigue (TMF) behavior of the austenitic stainless steel AISI 304L has been studied in plastic strain control between room temperature and 1073K at a plastic strain amplitude of Δεpl/2 = 0.5% in vacuum. The isothermal fatigue experiments showed a maximum of the stress amplitude connected with a change of the dislocation slip mode towards planar glide in an intermediate temperature region between about 550K and 800K as a result of dynamic strain ageing processes. The stress amplitudes in TMF tests are strongly influenced by the maximum temperature. When the maximum temperature lies below 873K and the temperature intervals extend over the full range of dynamic strain ageing, the stress amplitudes are very similar to the maximum values under isothermal conditions. With increasing maximum temperature, dynamic recovery by dislocation climb gains importance and the stress amplitudes decrease. When the maximum temperature of the TMF cycling exceeds a limit of about 1000K, dynamic recrystallization is observed. The numbers of cycles to fracture depend strongly on the phase between temperature and plastic strain. In particular, during in-phase cycling with a maximum temperature of 923K and higher, early failure occurs due to creep damage during the tensile half cycle. At maximum temperatures lower than 823K, the absence of creep phenomena results in similar cycle numbers to fracture in out-of-phase and inphase tests, respectively.

    Keywords:

    austenitic stainless steel, temperature dependence of cyclic stress-strain behavior, thermomechanical fatigue, dynamic strain ageing, microstructural development, dislocation arrangement


    Author Information:

    Zauter, R
    Research Assistant, Senior Research Associate and Professor, Institut für Werkstoffwissenschaften, Lehrstuhl I, Universität Erlangen-Nürnberg, Erlangen,

    Petry, F
    Development Engineer, Augsburg,

    Christ, H-J
    Research Assistant, Senior Research Associate and Professor, Institut für Werkstoffwissenschaften, Lehrstuhl I, Universität Erlangen-Nürnberg, Erlangen,

    Mughrabi, H
    Research Assistant, Senior Research Associate and Professor, Institut für Werkstoffwissenschaften, Lehrstuhl I, Universität Erlangen-Nürnberg, Erlangen,


    Paper ID: STP24250S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP24250S


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