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In modern industrial world, engineering components are prone to
more rapid surface degradation such as erosion-corrosion,
overheating, wear, solid particle abrasion, high temperature
corrosion, etc. Due to above surface degradation, major problems
causes tube wall thinning, results in premature failure of the
super heater and reheater tubes. Alloys used at high temperature
should possess good mechanical properties along with erosion -
corrosion resistance. The present study behavior of boiler steel
ASTM-SA213 T-22 (used in most of the power plants in the Northern
India) has been investigated for high temperature erosion-corrosion
behavior in the uncoated as well as coated condition. Detonation
Gun thermal spraying process was used for coating on boiler steel.
SEM/EDAX, XRD and X-ray mapping analysis done to reveal the
microstructure and compositional features of boiler steel. The
microstructure indicates uniform and dense coating.
Thermogravimetric techniques is used to investigate the
erosion-corrosion behavior at 900 C for 1000 hours. SEM/EDAX, XRD
and X-ray mapping techniques were used to analyze the corrosion
products."
There is extensive work on the fracture of steel with ferrite and
austenite structure, but little on fracture behaviour of ADI, whose
microstructure also comprises austenite and ferrite. The present
work is aimed in this direction. The role of austempering
tempeature on the fracture behaviour of Ni-Mo austempered ductile
iron has been studied. In present work, the fractographic and
fractomicrographic features of the fractured specimens austempered
at 270, 330, 380 C for 1 hr and broken in tensile test and impact
test, respectively, have been studied. The matrix of ADI is a
complex mixture of austenite, bainitic ferrite needles with or
without carbide particle depends upon the austempering temperature.
The matrix of ADI can withstand a certain amount of deformation
before fracture during tensile or impact testing, however the
graphite nodules in the matrix cannot deform and hence are barrier
to matrix deformation and give rise to crack initiation. The crack
propagation is influenced by the orientation of bainitic ferrite
with respect to load direction, also by the presence of carbide
particles inside the needles. Thus producing characteristic
features."
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