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Microstructural characterization of cyclic deformation behavior of metastable austenitic stainless steel AISI 347 with different surface morphology

Published online by Cambridge University Press:  29 August 2017

Marek Smaga ,
Robert Skorupski ,
Dietmar Eifler  and
Tilmann Beck
Marek Smaga*
Affiliation:
Institute of Materials Science and Engineering, University of Kaiserslautern, Kaiserslautern D-67653, Germany
Robert Skorupski
Affiliation:
Institute of Materials Science and Engineering, University of Kaiserslautern, Kaiserslautern D-67653, Germany
Dietmar Eifler
Affiliation:
Institute of Materials Science and Engineering, University of Kaiserslautern, Kaiserslautern D-67653, Germany
Tilmann Beck
Affiliation:
Institute of Materials Science and Engineering, University of Kaiserslautern, Kaiserslautern D-67653, Germany
*
a) Address all correspondence to this author. e-mail: smaga@mv.uni-kl.de
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Abstract

In the present work, specimens of the metastable austenitic stainless steel AISI 347 with different surface morphologies were investigated in stress-controlled fatigue tests in the high cycle fatigue (HCF) regime at ambient temperature. Specific surface morphologies were generated by cryogenic turning with CO2 snow cooling. As a result of the metastable austenite microstructure, phase changes from paramagnetic austenite to ferromagnetic martensite take place in the near-surface regime during cryogenic turning as well as in the whole specimen volume during monotonic and/or cyclic elastic–plastic deformation. The metastability of AISI 347 was characterized according to the M S-temperature determined from the chemical composition and by X-ray diffraction measurements with in situ cooling. Microhardness and strength of both phases were measured. Near-surface microstructure was analyzed by optical and scanning electron microscopy after focused ion beam preparation. Besides a partially martensitic surface layer, a thin nanocrystalline layer, both induced by cryogenic turning, was observed. In case of cyclic loading, the martensitic surface layer leads to a reduction of plastic strain amplitude as well as a retardation of crack initiation and consequently to an increase in fatigue life.

Keywords

fatiguephase transformationmicrostructure
Type
Article
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. 4452 - 4460
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Mathias Göken

References

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