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Impact strength of as-cast and heat-treated nodular cast iron

Soiński M. S., Będkowski P.

Archives of Foundry Engineering

2008

Vol. 8, iss. 1

113-118

The paper deals with comparing the impact strength of as-cast nodular cast iron with ferritic-pearlitic matrix (pearlite fraction up to 20%) and of the same material subjected to graphitising (one- or two-stage process) in order to achieve ferritic structure. It has been found that the impact strength of cast iron samples is significantly higher after the heat treatment than in the as-cast state. The two-stage process increases the impact strength at any of examined temperature values to a greater degree than the one-stage graphitising. Also the character of impact strength changes against the change of temperature (from 20°C to -40°C) is different depending on the type of the previously applied treatment. It has been also found that the impact strength value strictly depends on the position within the test bar from which a sample has been taken.