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000824694 1001_ $$0P:(DE-Juel1)129727$$aHuczkowski, P.$$b0$$eCorresponding author
000824694 245__ $$aEffect of Gas Flow Rate on Oxidation Behaviour of Alloy 625 in Wet Air in the Temperature Range 900-1000 °C
000824694 260__ $$aWeinheim [u.a.]$$bWiley-VCH$$c2017
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000824694 520__ $$aIn many industrial processes, the flow rate of hot gaseous service environments may be in the range of several m/s. In the present paper, the effect of gas flow rate on the high temperature oxidation behaviour of alloy 625 in wet air is presented. The gas velocity was varied from near static conditions to linear gas flow rates up to 6 m/s. The oxidation kinetics were studied by gravimetry during cyclic/discontinuous testing at 900 and 1000 °C. The oxide scales and the subsurface depletion zones formed during exposure were studied by light optical microscopy, scanning electron microscopy with energy dispersive X-ray analysis and, for selected specimens, by electron backscatter diffraction. It was found that Cr loss due to formation of volatile species is substantially enhanced by high gas flow rates thus significantly influencing the oxidation limited life time of the oxidising component. Within the studied range of flow rates no plateau value was reached, the Cr loss being substantially larger at a flow of 6 m/s than at 0.7 m/s. Additionally, it was found that geometrical factors of the test specimen substantially affected the extent of volatile species formation. Especially the leading edge of the specimen exhibited more extensive Cr loss than the other specimen areas.
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000824694 7001_ $$0P:(DE-Juel1)129883$$aLehnert, W.$$b1
000824694 7001_ $$0P:(DE-HGF)0$$aAngermann, H.-H.$$b2
000824694 7001_ $$0P:(DE-Juel1)129701$$aChyrkin, A.$$b3
000824694 7001_ $$0P:(DE-Juel1)156565$$aPillai, R.$$b4
000824694 7001_ $$0P:(DE-Juel1)145209$$aGrüner, D.$$b5
000824694 7001_ $$0P:(DE-Juel1)145343$$aHejrani, E.$$b6
000824694 7001_ $$0P:(DE-Juel1)129782$$aQuadakkers, W. J.$$b7
000824694 773__ $$0PERI:(DE-600)1481051-7$$a10.1002/maco.201608831$$n2$$p159-170$$tMaterials and corrosion$$v68$$x0947-5117$$y2017
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