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Understanding the microstructure-properties relationship of low-temperature carburized austenitic stainless steels through EBSD analysis
Chalmers, Sweden.
Chalmers, Sweden; Uddeholms AB, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, Faculty of Science & Engineering.
Chalmers, Sweden.
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2017 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 322, 141-151 p.Article in journal (Refereed) Published
Abstract [en]

The present article is dedicated to the microstructural characterization of the surface layer of two different austenitic stainless steels, 304L and 9041, subjected to a low-temperature carburizing process (Kolsterising (R), Bodycote) and a subsequent annealing at high-temperature. The carburizing treatment forms a hard expanded austenite in both materials. However, thermal decomposition occurs at high temperatures through precipitation of chromium-carbides, hence compromising the surface hardness of the treated materials. The purpose of this paper is to explore the potential applicability of electron backscatter diffraction (EBSD) technique to reveal the correlation between phase transformation and hardness. First of all, EBSD was used to create kernel average misorientation (KAM) maps of the modified surface layers to identify the internal strains. Moreover, the preferential sites for precipitation of chromium-compound during annealing were identified. We prove here that EBSD can provide useful information to distinguish the main hardening mechanisms within modified surface layers at different annealing conditions. When combined with nano-indentation, X-ray diffraction (XRD) and glow discharge optical emission spectrometry (GDOES), an effective bridge between macro and microanalysis can be obtained. Solid solution hardening was found to be the dominant mechanism in as-carburized materials, with pre-existing strain promoting a higher supersaturation. In the annealed materials, the alloy composition and surface finish can also dictate the preferential sites of precipitation and can therefore affect the residual hardening. (C) 2017 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2017. Vol. 322, 141-151 p.
Keyword [en]
Surface modification; Kolsterising; Expanded austenite; S-phase; Austenitic stainless steel; EBSD; Kernel average misorientation
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-139255DOI: 10.1016/j.surfcoat.2017.05.036ISI: 000403995700019OAI: oai:DiVA.org:liu-139255DiVA: diva2:1120990
Note

Funding Agencies|National Graduate School of Materials Science; Royal Society of Arts and Sciences in Gothenburg, Sweden

Available from: 2017-07-07 Created: 2017-07-07 Last updated: 2017-07-07

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