Behera, Gourahari and Sohala, Soumya Ranjan (2012) Effect of copper on the properties of austempered ductile iron castings. BTech thesis.
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Abstract
Two
types of ductile iron has been taken for the present investigation.
Both austempering time and temperature are considered as the main
variables for structure property correlation of Austempered Ductile
Iron. The two types of spheroidal graphite iron (differ by copper
percentage) were austempered at four differing austempering temperatures
viz. 250oC, 300oC, 350oC and 400oC for 60min, 90 min and 120 min
respectively. The effect of austempering variables on the mechanical
properties of spheroidal graphite iron was investigated as a function of
austempering time and temperature. The cooling rate and the quenching
techniques followed in the present study plays an important role for the
property development of spheroidal graphite iron. The tensile
properties have been correlated with the graphite morphology for both
grades of ADI. SEM micrographs have been taken from fracture surfaces of
the tensile specimen under different austempering conditions. It has
been found from the result that ADI having the alloying element (copper)
achieved significant mechanical properties as compared to ADI without
having copper throughout the different austempering processes adopted in
this study.
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RépondreSupprimerAs my knowledge Austempered ductile iron ADI is a almost new engineering material with exceptional sequence of mechanical properties. And the Ductile Iron Society's objective is to advance the technology, art, science of ductile iron production and to disseminate all such information to the members..