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Licensed Unlicensed Requires Authentication Published by De Gruyter December 30, 2021

Microstructure, Plastic Deformation Characteristics, and Mechanical Properties of As-cast and Ferritic Heat-treated SG-Iron in a Wide Range of Solidification Cooling Rates

Nabil Fatahalla, Taha Gomaa, Sherif Bahi and Mazen Negm


The ferritic heat-treated SG-iron showed a decrease in strength by an average of 15 %, relative to the respective as-cast ingots. Meanwhile, an average increase in ductility of 30 % for sand mould ingots and of 240 to 490 % for the metal mould ingots was observed. Additionally, toughness improved for all investigated ingots due to the heat treatment (for metal mould ingots it showed an improvement range of 155 to 320 %). The, comparatively, drastic increase in ductility and toughness of the heat-treated ingots is discussed. The slip traces observed on the as-cast sand mould and ferritic heat-treated ingots were dominantly localised in the neighbourhood of graphite nodules and among them. A butterfly-like pattern of slip covered neighbouring ferrite grains revealing their grain boundaries. Differences in plastic deformation between ferrite and pearlite revealed the phase boundaries.

N. Fatahalla, T. Gomaa, S. Bahi, M. Negm Mechanical Department Faculty of Engineering Al Azhar University Cairo, Egypt


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Received: 1998-03-30
Published Online: 2021-12-30

© 1998 Carl Hanser Verlag, München