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In situ study of granular micromechanics in semi-solid carbon steels

This original study exploits the synergies between metal casting and soil mechanics. The micro-structural response of semi-solid carbon steel to loading is quantified by analysis of time-resolved synchrotron radiographs. The evidence provided of the austenite grains rearranging as quasi-rigid bodies, transmitting shear and compressive forces across grain-grain contacts and causing shear-induced dilation, supports the hypothesis that the behaviour of a semi-solid steel can be interpreted using a granular mechanics approach. This paper presents recommendations for rheology experiments and for development of novel manufacturing technologies, which will predict and prevent casting defects with direct economic and environmental benefits.