Damage evaluation of fossil fuelled power plant boiler tubes through magnetic Barkhausen technique

摘要: Abstract The failure mechanism of two economizer tubes a fossil fuelled 260 MW power plant has been investigated through the magnetic Barkhausen emission (MBE) technique along with conventional and established materials characterization evaluation techniques (like microstructures, mechanical properties X-ray diffraction). longer service exposer period results in breaking ferrite–pearlite structure spheroidization lamellar cementite ferrite matrix, associating high r.m.s. voltage for former structure. was governed by cold end corrosion process presence sulfates, subsequent erosion hard quartz particles leads to localized thinning outer surface. Accordingly, hoop stress operative tube walls failed fish-mouth opening. MBE response pulse height distribution throw light on microstructural changes duration exposure as well leaked non-leaked regions tubes.