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Effect of Nickel and Aluminium on Solid State Transformations in SG Iron

Published online by Cambridge University Press:  21 February 2011

A. C. Ganguli ,
A. K. Chakrabarti  and
S. C. Dasgupta
A. C. Ganguli
Affiliation:
Regional Engineering College, Durgapur, India
A. K. Chakrabarti
Affiliation:
Indian Institute of Technology, Kharagpur, India
S. C. Dasgupta
Affiliation:
Regional Engineering College, Durgapur, India
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Abstract

The individual and combined addition of nickel and aluminium to S.g. iron influences several solid state transformations. Nickel depresses the temperature range for reversion of ferrite and pearlite to austenite on heating, while aluminium raises it. Combined addition of nickel and aluminium restores the temperature range closer to that for unalloyed iron. But nickel enhances the kinetics of ferritisation during tempering and weakly retards recrystallisation of ferrite grains. Aluminium strongly retards both the ferritisation and recrystallisation processes. Ferritisation kinetics is enhanced and recrystallisation of ferrite grains is also hastened in alloys containing nickel and aluminium. Alloys containing nickel and aluminium also respond to agehardening treatment in the temperature range 450–550°C after a solution treatment-cum-ferritising anneal at 700°C. On the basis of X-ray diffraction and electron microscopic studies, a probable mechanism of ageing has been proposed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 34: Symposium – Physical Metallurgy of Cast Iron , 1984 , 325
Copyright
Copyright © Materials Research Society 1985

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References

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