Atomic-scale investigation of carbon atom migration in surface induced white layers in high-carbon medium chromium (AISI 52100) bearing steel

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Atomic-scale investigation of carbon atom migration in surface induced white layers in high-carbon medium chromium (AISI 52100) bearing steel

Hosseini, Seyed, 1981 (author): RISE,Tillverkningsprocesser,Chalmers University of Technology, Sweden; AB SKF, Sweden

Thuvander, Mattias, 1968 (author): Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Sweden

Klement, Uta, 1962 (author): Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Sweden

Sundell, Gustav, 1985 (author): Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Sweden

Ryttberg, Kristina, 1977 (author): SKF Group,AB SKF, Sweden

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(creator_code:org_t)

Elsevier BV, 2017
2017
English.
In: Acta Materialia. - : Elsevier BV. - 1359-6454 .- 1873-2453. ; 130, s. 155-163

Related links:: http://dx.doi.org/10...; show more...; https://doi.org/10.1...; https://research.cha...; https://urn.kb.se/re...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

The microstructure and chemical composition of white layers (WLs) formed during hard turning of AISI 52100 steel were studied using atom probe tomography (APT) and transmission electron microscopy (TEM). APT analyses revealed a major difference in the re-distribution of the carbon (C) atoms between WLs formed above and below the Ac1 temperature, i.e. T-WL and M-WL, respectively. In T-WL, the C-atoms segregate to grain boundaries (GBs) forming interconnected or isolated C-rich clusters, ∼5 nm, with a concentration of 9.8 ± 0.3 at.%C. Apart from the GB segregation, in M-WLs, large C-rich regions were found with 24.8 ± 0.4 at.%C. Owing to the chemical composition (stoichiometry) and element partitioning of such regions, they were assigned as θ-carbides (cementite). The APT results reveal that the original θ-carbides remain un-dissolved in the M-WLs, but might be plastically deformed due to the excessive strain that exists in hard machining process. The obtained results are in good agreement with the temperatures that are reached during formation of M-WLs. The isolated nano-sized C-clusters were assigned as off-stoichiometric carbides whereas the interconnected C-rich clusters were attributed to Cottrell atmospheres, evident by the linear shape of the C-enrichment as observed in the APT reconstructions. The C-contents in the nano-sized martensitic and ferritic grains were estimated to 0.50 ± 0.06 at.%C and ∼0.46 ± 0.02 at.%C, respectively. The C-content in the ferritic grains, beyond the C-solubility limit in ferrite (

Subject headings

TEKNIK OCH TEKNOLOGIER -- Maskinteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Mechanical Engineering (hsv//eng)
TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
NATURVETENSKAP -- Fysik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences (hsv//eng)
TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)

Keyword

White layer
Martensite
Carbon diffusion
Nanocrystalline microstructure
Atom probe tomography

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art (subject category)
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