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Information Journal Paper

Title

FABRICATION OF ULTRA-FINE GRAINED PLAIN LOW CARBON STEEL THROUGH DYNAMIC STRAIN INDUCED TRANSFORMATION DURING INTEGRATED EXTRUSION EQUAL CHANNEL ANGULAR PRESSING

Pages

  73-85

Abstract

 In the present research, an effective thermo-mechanical processing route in the temperature range of metastable austenite region (Ae3<T<Ar3) was employed to achieve ultra-fine grain size in a plain low carbon steel during integrated extrusion equal channel angular pressing. At first, the effect of preheating temperature on the strain and temperature distributions inside the deformed samples were investigated using 3D FINITE ELEMENT SIMULATION. According to the result of FEM simulation, the preheating temperature of 930oC was selected as an appropriate temperature for fabrication of ultra-fine ferrite structure. SEVERE PLASTIC DEFORMATION was then imposed on samples with the predicted preheating temperature and the results showed a great consistency with FEM simulation predictions. Optical micrographs taken from the center point of the samples showed that the ferrite grains could be refined from 32 mm to 1-3 mm by different mechanisms.

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