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Comparison of the Dislocation Structure of a CrMnN and a CrNi Austenite after Cyclic Deformation

1
Product and Process Development, voestalpine BÖHLER Edelstahl GmbH & Co KG, 8605 Kapfenberg, Austria
2
AGD Seibersdorf, University of Leoben, 2444 Seibersdorf, Austria
3
Österreichisches Gießerei-Institut, University of Leoben, 8700 Leoben, Austria
4
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, 8700 Leoben, Austria
*
Author to whom correspondence should be addressed.
Metals 2019, 9(7), 784; https://doi.org/10.3390/met9070784
Received: 14 May 2019 / Revised: 19 June 2019 / Accepted: 19 June 2019 / Published: 13 July 2019
(This article belongs to the Special Issue Physical Metallurgy of High Manganese Steels)
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Abstract

In the literature, the effects of nitrogen on the strength of austenitic stainless steels as well as on cold deformation are well documented. However, the effect of N on fatigue behaviour is still an open issue, especially when comparing the two alloying concepts for austenitic stainless steels—CrNi and CrMnN—where the microstructures show a different evolution during cyclic deformation. In the present investigation, a representative sample of each alloying concept has been tested in a resonant testing machine at ambient temperature and under stress control single step tests with a stress ratio of 0.05. The following comparative analysis of the microstructures showed a preferred formation of cellular dislocation substructures in the case of the CrNi alloy and distinct planar dislocation glide in the CrMnN steel, also called high nitrogen steel (HNS). The discussion of these findings deals with potential explanations for the dislocation glide mechanism, the role of N on this phenomenon, and the consequences on fatigue behaviour. View Full-Text
Keywords: austenitic high nitrogen steel (HNS); cold deformation; fatigue austenitic high nitrogen steel (HNS); cold deformation; fatigue
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Fluch, R.; Kapp, M.; Spiradek-Hahn, K.; Brabetz, M.; Holzer, H.; Pippan, R. Comparison of the Dislocation Structure of a CrMnN and a CrNi Austenite after Cyclic Deformation. Metals 2019, 9, 784.

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