Iron Systems, Part 1

The Estimation of Stability and Growth of F.C.C. Iron Nanocluster Containing the Impurity Atoms

“…Therefore, we took into account the statics only, when energy changes were evaluated using the method of molecular mechanics (MM+). We regarded such nanocluster as the nanosize analogy of the microscopic metastable γ-phase of the Fe-Ni-C alloy that was able to form under the influence of the non-equilibrium conditions and has been studied well before [21][22][23][24][25]. We performed the evaluation of energy empirically using the solution of the Newton equations' set:…”

The effect of hot-stamping process on the local electrochemical behaviour of the 22 MnB5 steel coated with hot-dip aluminium-silicon

“…Lemmens [49] have highlighted the difficulty in determining these ternary intermetallics due to their very similar chemical composition. Consequently, different studies have been done in order to characterise the intermetallic phases in the Fe-Al-Si system [37,49,51,53,[55][56][57][58]. Nevertheless, contradictory results related to the stoichometry of the intermetallics in the Al-Fe-Si system can be often found in the literature.…”

“…This can be ascribed to the absence of standard X-ray diffraction parameters in the conventional software that did match the measured ones, for most of the phases present in the Fe-Al-Si system found in the software libraries. On the other hand, many of these phases already have their crystalline structure, symmetries and lattice parameters reported and available [58]. These parameters enable the direct determination of the possible reflexion positions for each family of crystallographic planes [74].…”

“…The main peaks presented in the X-ray patterns for both AR and PHS samples were indexed in Python, where a specific data base, based on the literature [56][57][58], was built to characterise the possible phases of the Al-Fe-Si system. The results for AR sample are seen in Table 9.1.…”

“…The steel substrate of AR condition was composed of ferrite and pearlite, which was hot dipped in an Al-Si molten bath at temperature range from 600 °C -750 °C. For these reasons, martensite could not be considered as a suitable phase as well as the intermetallic FeSi2, which resulted from an invariant equilibrium between iron and silicon at 937 °C: FeSi2 ↔ FeSi2 + Si [58]. The θ and η phases were not selected as the most suitable phases for the AR sample, though they have been suggested as possible phases.…”