Abstract
The tensile properties of a ferritic blackheart, a pearlitic, and two whiteheart malleable irons were determined at temperatures down to 77 K and stress-strain curves autographically recorded. Fracture characteristics have also been studied. Proof stress values and tensile strengths of malleable irons increase with decreasing temperature. The room temperature elongation of a blackheart and a quenched and tempered malleable iron is retained down to about 175 K. The temperature at which the elongation of a whiteheart malleable iron decreases is strongly dependent on microstructure.
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