engleski

The influence of microstructural characteristics and temperatures on the toughness of ferritic ductile iron

The influence of microstructural characteristics and temperatures on the as-cast ferritic ductile iron toughness was analyzed in this paper. The toughness of ductile iron samples in as-cast condition was examined by Charpy method at room temperature (20°C) and low temperatures (0°C, -20°C, -40°C) according to EN 10045-1. It was found that the toughness of ferritic ductile iron increases with the increase of the amount of ferrite in the metal matrix at all testing temperatures. As the nodularity increases, the toughness of ferritic ductile iron increases at 20°C, 0°C and -20°C. At -40°C there is no correlation between toughness and nodularity due to the dominant influence of metal matrix. At 20°C and 0°C the ferritic ductile iron toughness increases with the increase of the nodule count to the certain maximum, afterwards the further increase of nodule count results in decreasing of toughness. At low temperatures (-20°C and -40°C), the ferritic ductile iron toughness constantly increases with increase of nodule count. In order to achieve optimal performance, a microstructural characteristics of ductile iron castings need to be adapted to specific working conditions.

ductile iron ; microstructure properties ; temperature ; toughness

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