Thermogravimetry and insitu mass spectrometry at high temperatures compared to thermochemical modelling – The weight loss during selective decarburisation at 800°C

Effect of Annealing Temperature on the Selective Oxidation and Reactive Wetting of a 0.1C-6Mn-2Si Advanced High Strength Steel During Continuous Galvanizing Heat Treatments

“…At the surface, however, since most of the Si was already bound to the internal oxides and also due to the continuous supply of O from the process atmosphere, the competition between Mn and Si for O was less than in the subsurface, enabling the formation of MnO in the lower Si/Mn ratio environment. 9,31) As discussed above, of particular interest was the exploration of the effect of the surface oxide microstructural development in relation to its impact on reactive wetting of the steel by the 0.20 wt% Al (dissolved) continuous galvanizing bath. As was seen in Figs.…”

Modelling and experiment of selective oxidation and nitridation of binary model alloys at 700 °C – The systems Fe, 1 wt.%{Al, Cr, Mn, Si}

“…Within the past decades, many efforts have been taken to shine light on the mechanisms of material degradation and precipitate formation in iron-based alloys, both from an experimental side [17][18][19][20][21][22][23], as well as by using theoretical simulations [24][25][26]. However, many works in this area either consider technical alloys, possessing rather complex steel compositions or investigate corrosion in complex gas mixtures (e.g.…”

“…Time evolution of oxidation and nitridation depth (left) and calculated phase distributions[23,36] of Fe, 1 wt.% Cr, exposed to N2=H2=H2O (97.5/2.5/1.07, v/v/v, +8°C dew point) at 700°C for 1 h (right). Experimental values for the corrosion depth are represented by blue dots.…”

Influence of Gas Composition and Exposure Cycle on the Formation of Surface and Subsurface Oxides in Iron-Aluminum-Based Alloys at High Temperatures

“…Remarkably, the depth of the internal corrosion zone in TRIP steel is bigger than that in pure iron-aluminum, but both values do not exceed the predictions from numerical simulations. [6,8] This suggests that manganese slightly accelerates internal oxidation in reheat furnace conditions but forms round-shaped precipitates instead of grain boundary oxides. Although selective oxidation of pure ternary Fe-2Mn-1Al samples [8] exhibits a clear tendency toward grain boundary oxide formation, it needs to be pointed out that this discrepancy is likely to be caused by the different oxygen fugacities in these atmospheres and the presence/absence of an outer iron oxide layer that affects oxidation kinetics.…”

“…However, it is often readily possible to remove an external iron oxide scale layer in silicon-free steels, formed during casting, reheating, and hot rolling. [7] If the internal oxidation underneath the oxide layer is too heavy, [8,9] this can cause problems during downstream processing (e.g., crevice corrosion in pickling solutions [10] or uncoated spots during galvanizing). By designing the gas composition in a reheat furnace in such a way that an outer scale layer may form, the internal oxide formation could be reduced.…”