Abstract
The influence of hydroextrusion on structural changes in Invar high-carbon alloy 1N31 with a graphite component has been studied by metallography, microhardness measurements, and transmission electron microscopy. This process is accompanied by an almost twofold increase in microhardness up to a depth of 270–300 μm measured along scratches applied across the longitudinal section of the sample in the last cycle of the second hydrodynamic extrusion pass. It has been proved by means of transmission electron microscopy that the achieved strengthening of the near-surface layers is connected not only with additional solid-solution strengthening of austenite owing to a complete dissolution of the graphite component in it, but also with the extreme dispersion level of structural elements that form twin orientations in two mutually normal directions. The results are discussed in the scope of the model proposed earlier for the formation and features of the hydrodynamic state of the sample material in the course of hydrodynamic extrusion.
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