Untitled

Residual stresses in alumina scales grown on different types of Fe–Cr–Al alloys: effect of specimen geometry and cooling rate

“…[11]), the appearance of tensile growth stresses after longer exposure times (Figs. 7 and 8) observed for all systems, except for the 2 mm thick ODS alloy is at a first glance surprising.…”

“…Measured literature values for growth stresses in alumina scales determined by different experimental set-ups (e.g. high temperature X-ray diffraction (XRD), deflection/elongation testing of thin metal strips, ruby fluorescence or XRD at room temperature with subsequent subtraction of the thermal stresses) vary by one order of magnitude [5][6][7][8][9][10][11] or even in sign [12].…”

Influence of sample thickness and microstructure on metal dusting behavior of NiCrFeAl alloys

“…For oxide spalling a thickness dependence is caused by growth and thermal stresses together with stress relaxation. [63][64][65][66][67] Also for chromia forming NiCr alloys depletions of minor elements have been considered, but stresses were more important in. [61,63] In this paper there are four groups of samples (Rows 1, 2, 4, and 5 in Table 12), which have the sample thickness as only difference.…”

Internal stresses and textures of nanostructured alumina scales growing on polycrystalline Fe3Al alloy

“…The important factors that affect the integrity of the protective oxide scale are growth stresses that develop within the scale, intrinsic to the oxidation process, and also the residual stresses that result after cooling to room temperature from the differences in thermal expansion between the metal substrate and the oxide (Tolpygo and Clarke, 1999). For this reason, much effort has been put forth in the past years to characterize the evolution of growth stresses in oxide scales during oxidation (Schumann et al , 2000; Messaoudi et al , 2000; Mennicke et al , 2001; Clarke, 2002; Eschler et al , 2004; Huntz et al , 2007). In the specific case of Al 2 O 3 forming alloys, recent studies have focused on the in situ determination of growth stresses during high-temperature oxidation (above 1000 °C) of Ni-Al and Fe-Cr-Al alloys using synchrotron radiation (Specht et al , 2004; Veal et al , 2006; Reddy et al , 2007; Veal and Paulikas, 2008).…”