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Comparison of Hardness Enhancement and Wear Mechanisms in Low Temperature Nitrided Austenitic and Martensitic Stainless Steel

Published online by Cambridge University Press:  01 February 2011

S. Mändl ,
D. Manova ,
D. Hirsch ,
H. Neumann  and
B. Rauschenbach
S. Mändl
Affiliation:
Leibniz-Institut für Oberflächenmodifizierung, Permoserstr. 15, 04303 Leipzig, Germany
D. Manova
Affiliation:
Leibniz-Institut für Oberflächenmodifizierung, Permoserstr. 15, 04303 Leipzig, Germany
D. Hirsch
Affiliation:
Leibniz-Institut für Oberflächenmodifizierung, Permoserstr. 15, 04303 Leipzig, Germany
H. Neumann
Affiliation:
Leibniz-Institut für Oberflächenmodifizierung, Permoserstr. 15, 04303 Leipzig, Germany
B. Rauschenbach
Affiliation:
Leibniz-Institut für Oberflächenmodifizierung, Permoserstr. 15, 04303 Leipzig, Germany
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Abstract

Energetic nitrogen implantation into austenitic stainless steel or nickel alloys leads to the formation of a very hard and wear resistant surface layer with an expanded lattice, while similar results are reported for selected martensitic steels. A comparison of the phase formation under identical process conditions at 380 °C using an austenitic (304) and a martensitic (420) steel grade (in an annealed ferrite/cementite condition) shows that the initial microstructure is retained in both of them. As the formation of dislocations and stacking faults cannot account for the dramatic hardness increase, the build-up of compressive stress is proffered as an explanation covering these two steel types. Furthermore the energetic nitrogen implantation apparently stabilizes the expanded lattice with suppressing the chemical transition to iron nitrides and, for steel 420, the metallurgical transition towards austenite at high nitrogen contents.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 843: Symposium T – Surface Engineering-Fundamentals and Applications , 2004 , T3.9
Copyright
Copyright © Materials Research Society 2005

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References

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