Under-stoichiometric cementite in decomposing binary Fe-C pearlite exposed to rolling contact fatigue

Reconstructing dual-phase nanometer scale grains within a pearlitic steel tip in 3D through 4D-scanning precession electron diffraction tomography and automated crystal orientation mapping

“…Multiple planar (001) 𝜃 ∥ (112 ̅ ) 𝛼 relationships between cementite particles and neighbouring ferrite grains were observed and are further detailed in SI 6. These represent partial Bagaryatsky-type orientation relationships [41]. The lack of complete cementite-ferrite orientation relationship observed within the sample is likely due to the large amounts of plastic deformation within the sample due to the cold-drawing processing technique.…”

Formation Mechanism of Brown Etching Layers in Pearlitic Rail Steel

“…The acquired APT datasets were analyzed with the CAMECA AP Suite 6.1 software. The ranging of mass spectra was conducted according to Tung et al [14] and widely applied standard protocols [17][18][19][20][21] . To extract more accurate compositions, we conducted separate analyzes on regions of interest (ROIs) using the built-in peak decomposition algorithm in the AP Suite software, where all overlapping peaks (including all ion types) are separated and unmixed in the mass spectrum.…”

Formation mechanism of brown etching layers in pearlitic rail steel

“…Therefore, in Ref. [14] , we investigated the mechanical and thermal effects individually under controlled laboratory conditions. To decouple these two factors, we used a binary Fe-C pearlitic steel, employed a rolling contact fatigue test at a controlled temperature of 60 °C to investigate the impact of mechanical deformation separately, and then conducted heat treatments on the same specimen to investigate the effect of elevated temperatures solely.…”