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An oxide scale formed at 900℃for 60sin dry air was subjected to the simulated coiling processed with different coiling temperatures.The phase transformation behavior,especially the orientation distribution of the oxide scale,was analyzed using electron backscattered diffraction(EBSD)technique.When cooling from the coiling temperature of 650℃,the scale consists of Fe3O4layer,FeO layer and Fe3O4seam.The Fe3O4precipitates are observed in the FeO grains of the scale formed with the coiling temperature of 550and 450℃.With the coiling temperature of 350℃,the decomposition of FeO is suppressed due to the low temperature.The Fe3O4grains,which are decomposed from FeO,has the same orientation as the parent FeO grains.Moreover,the FeO grains,of which the growth direction is parallel to<001>,is easier to decompose into Fe3O4than the grains with other orientations.
An oxide scale formed at 900 ° C for 60 sin dry air was subjected to the simulated coiling process with different coiling temperatures. Particularly the orientation distribution of the oxide scale, was analyzed using electron backscattered diffraction (EBSD) technique. from the coiling temperature of 650 ° C, the scale consists of Fe3O4layer, FeO layer and Fe3O4seam.The Fe3O4precipitates are observed in the FeO grains of the scale formed with the coiling temperature of 550and 450 ℃ .With the coiling temperature of 350 ℃, the decomposition of FeO is suppressed due to the low temperature. The Fe3O4grains, which are decomposed from FeO, has the same orientation as the parent FeO grains. Moreover, the FeO grains, of which the growth direction is parallel to <001>, is easier to decompose into Fe3O4than the grains with other orientations