Abstract
The effect of precipitated austenite on the fracture of an Fe-8Ni-2Mn-0. 1Ti steel was investigated. The study attempted to correlate microstructure, mechanical properties, and the fracture surface appearance of specimens heat treated to contain austenite or to be austenite free. The fracture surfaces were quantitatively studied using a 3D imaging technique in the SEM. It was found that the presence of austenite had a beneficial influence of lowering the ductile-to-brittle transition temperature. Part of this decrease was found to be due to the austenite gettering deleterious elements off the grain boundaries. Specimens that contained precipitated austenite were also found to have a smaller median facet size, when fractured in a brittle transgranular mode, than specimens with no austenite. The smaller facet size is shown to be associated with a decrease in ductile-to-brittle temperature.
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Frear, D., Morris, J.W. A study of the effect of precipitated austenite on the fracture of a ferritic cryogenic steel. Metall Trans A 17, 243–252 (1986). https://doi.org/10.1007/BF02643900
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DOI: https://doi.org/10.1007/BF02643900