Abstract
Overheating is the main concern in steam generating system because of the deposition of oxalates on the water side resultant of high-temperature which creates localized spallation/cracking in normally protective oxide scale, leads to catastrophic failures. This research article, therefore, focused on oxidation kinetics, oxide cracking of HAZs and weld-metal of Shielded Metal Arc (SMA) weldment in T22 steel after exposure to thermal-cyclic conditions at 900 °C in air. Thermogravimetry method was applied to examine the kinetics-of oxidation. The scale thickness on HAZs was merely higher than weld-metal because the formation of higher extent of surface cracks, and non-availability of Cr-in inner-scale as confirmed by EDX, provides the easy diffusion path for ionic-transport. Oxide-scale of these regions of weldment obeys the parabolic-kinetics.
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