Mössbauer characterisation of bearing steels and dark etching regions
Sebastián Echeverri Restrepo (King’s College London, SKF Research & Technology Development)
H. Huang (SKF Research & Technology Development, TU Delft - Team Maria Santofimia Navarro)
Mohamed Y. Sherif (SKF Research & Technology Development)
A.I. Dugulan (TU Delft - RID/TS/Instrumenten groep, TU Delft - RST/Fundamental Aspects of Materials and Energy)
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Abstract
Dark etching regions (DERs) are a widely studied phenomenon in the context of sub-surface microstructure decay in rolling bearings. These regions result from dislocation motion (plasticity) and carbon migration due to rolling contact fatigue (RCF). We conducted a systematic study using Mössbauer spectroscopy to identify phase evolution during tempering and DER formation. Our findings resolve a long-standing debate in the literature by demonstrating that fine temper carbides dissolve during DER formation. A slight decrease in non-stoichiometric carbides was observed in the DERs, indicating the dissolution of fine carbides. The released carbon is believed to back-diffuse into ferrite and/or martensite.
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