Some aspects of atom-probe analysis of FeC and FeN systems

Atom probe tomography characterization of nitrogen induced decomposition in low temperature plasma nitrided 304L austenitic stainless steel

“…The measured concentrations of substitutional elements are in good agreement with the expected ones, although, N concentration is much lower. The reason of this underestimation might be potential evaporation of molecular N 2 ions [19] or overlapping with Fe main peak, as mentioned above.…”

“…The Si content has been estimated from isotopic abundance of minor Si isotope at 14.5 Da [18]. In addition, N potentially evaporates as 14 N þ 2 and 14 N 2 þ 2 and overlaps with the 56 Fe 2 þ and 14 N þ 2 peaks, respectively [19]. This results in an underestimation of the actual nitrogen concentration.…”

Surface Hardening and Nitride Precipitation in the Nitriding of Fe-M1-M2 Ternary Alloys Containing Al, V, or Cr

“…Peaks in the mass spectrum were assigned as follows: Fe +++ (18.7 Da), Fe ++ (27, 28, 28.5 (32,33 Da). For the sake of simplicity, the N 2 + peaks at 28 and 29 Da [26] are ignored. When the specimen contains both Cr and V, the peak at 33 Da was assigned to CrN ++ .…”

On the Decomposition of Martensite during Bake Hardening of Thermomechanically Processed Transformation-Induced Plasticity Steels

“…Previous atom probe studies of martensite decomposition have used atom probe field ion microscopes, which have a severe limitation on the volume of material analyzed. [9][10][11][12][13][14][15][16][17] Development in recent years of the latest generation of atom probes, namely, the local electrode atom probe, now allows for much faster data gathering from much larger volumes than was possible 5 to 7 years ago. [18,19] This development results in the direct determination of chemical composition, shape, and distribution of fine microstructural features present in the material, even in low densities, such as nanoscale precipitates, clusters, and other solute segregations.…”