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Cyclic deformation behavior of austenitic stainless steels in the very high cycle fatigue regime—Experimental results and mechanism-based simulations

Published online by Cambridge University Press:  08 August 2017

Philipp-M. Hilgendorff ,
Andrei C. Grigorescu ,
Martina Zimmermann ,
Claus-Peter Fritzen  and
Hans-Juergen Christ
Philipp-M. Hilgendorff
Affiliation:
Institut für Mechanik und Regelungstechnik—Mechatronik, Universität Siegen, Siegen 57068, Germany
Andrei C. Grigorescu
Affiliation:
Institut für Werkstofftechnik, Universität Siegen, Siegen 57068, Germany
Martina Zimmermann
Affiliation:
Institut für Werkstoffwissenschaft, Technische Universität Dresden, Dresden 01069, Germany
Claus-Peter Fritzen
Affiliation:
Institut für Mechanik und Regelungstechnik—Mechatronik, Universität Siegen, Siegen 57068, Germany
Hans-Juergen Christ*
Affiliation:
Institut für Werkstofftechnik, Universität Siegen, Siegen 57068, Germany
*
a)Address all correspondence to this author. e-mail: hans-juergen.christ@uni-siegen.de
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Abstract

Two austenitic stainless steels of strongly different stacking fault energies (SFEs) and correspondingly different stabilities of the austenite phase were studied with respect to their very high cycle fatigue (VHCF) behavior. The metastable austenitic stainless steel 304L shows a very pronounced transient behavior and a fatigue limit in the VHCF regime. The higher SFE of the 316L steel results in a less pronounced transient cyclic deformation behavior. The plastic shear is more localized, and the formation of deep intrusions leads to microcrack initiation. However, the propagation of such microcracks is impeded by α′-martensite formed very localized within the shear bands. A comprehensive description of the microstructural changes governing the cyclic deformation including the transient resonant behavior was developed and transferred into a mechanism-based model. Simulation results were correlated with the observed deformation evolution and the change of the resonant behavior of specimens during VHCF loading providing a profound understanding of the VHCF-specific deformation behavior.

Keywords

austenitic stainless steelsfatiguephase transformationsimulation
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 23: Focus Issue: Mechanical Properties and Microstructure of Advanced Metallic Alloys—in Honor of Prof. Haël Mughrabi PART A , 14 December 2017 , pp. 4387 - 4397
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Mathias Göken

References

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