Abstract
Hadfield steel, invented by Sir Robert Hadfield in 1882, has an exceptional hardness and toughness, which recommend it for the construction of executive elements of railway passages and digging equipment. In the former case, the structures are subjected mainly to dynamic deformation, when the texture of austenite is mainly controlled by slip. In a previous work on solution-treated T105Mn120, we observed a marked work hardening tendency during strain sweep cycles, with average rates of 5.3 GPa/μm, which was further augmented by frequency increase, causing storage moduli growth up to 176 GPa in the fifth cycle. In the present paper, the limit frequencies were chosen as 0.5 and 16.66 Hz, replicating the extreme dynamic loading conditions of the parts cast from Hadfield steel at minimum and maximum train wagons, respectively. Dynamic mechanical analysis (DMA) were performed in strain sweep mode, at the above two frequencies, at 233 K and 323K, aiming to reproduce the extreme weather conditions on the ground. The structural changes, observed by electron-scanning microscopy, were corroborated with strain sweep results.
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