Abstract
Thermomechanical treatments for steels involve deformation produced during or before an allotropic change in the microstructure. The treatments are often associated with an increase in the mechanical properties. It was found that improvement in mechanical properties was produced by the formation of a microstructure which consisted of spheroidal cementite in a ferritic matrix containing a very fine subgrain substructure. The experimental method is delineated with respect to the spheroidization process in the 823–973 K range. The mechanical properties of steel spheroidized at these temperatures have been correlated with the microstructure. It was verified that the flow stress and the ultimate tensile stress were significantly enhanced when the rolling temperature was decreased in the temperature range of 823–973 K. The greatest ductility obtained in the material was about 6 % and the ductility decreased with decreasing rolling temperature. The findings of this study indicated that for a constant carbide volume fraction, the flow stress and ductility were controlled by the interparticle spacing of spheroidized cementite.
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