SYMPOSIA PAPER Published: 01 January 1993
STP24250S

Thermomechanical Fatigue of the Austenitic Stainless Steel AISI 304L

Source

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.

Author Information

Zauter, R
Institut für Werkstoffwissenschaften, Lehrstuhl I, Universität Erlangen-Nürnberg, Erlangen, Germany
Petry, F
, Augsburg, Germany
Christ, H-J
Institut für Werkstoffwissenschaften, Lehrstuhl I, Universität Erlangen-Nürnberg, Erlangen, Germany
Mughrabi, H
Institut für Werkstoffwissenschaften, Lehrstuhl I, Universität Erlangen-Nürnberg, Erlangen, Germany
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: E08
Pages: 70–90
DOI: 10.1520/STP24250S
ISBN-EB: 978-0-8031-5239-7
ISBN-13: 978-0-8031-1871-3