Influence of grain size on nitrogen diffusivity in austenitic stainless steel

Ion nitriding of austenitic stainless steel with the aim to improve the tribological properties while retaining the excellent corrosion resistance is a well-established method. At the same time, strongly varying microstructures can be obtained depending on the pretreatment. In this work, the influen...

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Bibliographic Details
Published in:Surface & coatings technology 2007-04, Vol.201 (15), p.6686-6689
Main Authors: Manova, D., Mändl, S., Neumann, H., Rauschenbach, B.
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Diffusion
Exact sciences and technology
Expanded austenite
Grain size
Materials science
Other topics in materials science
Physics
PIII
SIMS
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Summary:Ion nitriding of austenitic stainless steel with the aim to improve the tribological properties while retaining the excellent corrosion resistance is a well-established method. At the same time, strongly varying microstructures can be obtained depending on the pretreatment. In this work, the influence of prior heat treatment in the temperature range between 950 and 1200 °C on the microstructure, especially the grain size, and the corresponding observed nitrogen diffusivity in austenitic stainless steel DIN 1.4301 (AISI 304, X6CrNi18.10) after nitrogen plasma immersion ion implantation (PIII) is studied. Cross-section and plan view samples were prepared and investigated. With increased annealing temperature, both larger grains and slower diffusion was observed, despite diffusion ranges much smaller than the average grain size. Another, still hidden effect of dislocation densities or other defects on both secondary parameters is suggested.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2006.09.104