Resumo

FIERRO, V.E. et al. Mechanical behaviour of spheriodal graphite cast iron in the temperature range Between -100°c and +100°c. Lat. Am. appl. res. [online]. 2003, vol.33, n.1, pp.7-12. ISSN 0327-0793.

Impact tests were done on spheroidal graphite cast iron samples, with five different microstructures. These were obtained by means of the following heat treatments: subcritical annealing, normalizing and two different austempering processes. Other samples were tested in their as-cast condition. The tests were carried out in a temperature range from -100°C to +100°C. Also, tensile tests and hardness measurements were performed to qualify the samples. Every specimen came from a single melt, cast in "Y" blocks of two different thicknesses. The impact test results showed an alteration in the fracture behaviour as a function of temperature. The transition temperature, in particular, showed a meaningful shift with the enlargement of the "Y" block. This feature can lead to lower performances than expected. The harder and tougher the matrix, the more important this shift was.

Palavras-chave : Cast iron; ADI; low temperature impact properties.

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