Abstract
Controlling grain size plays an important role in optimizing hot-working process and achieving the desirable mechanical properties. This paper focuses on a series of pre-stress dry grinding experiments to investigate the microstructure evolution of AISI 1045 steel considering the dynamic recrystallization (DRX) behavior. In order to reveal the effect mechanisms of grinding parameters and pre-stress on microstructural evolution, the simulation model is built. The model considers the effect of deformation temperature, grain size and pre-stress on DRX. By multiple linear regression analysis of the flow stress-strain datas, the DRX model parameters and volume fraction are determined. Than the nucleation mechanism of DRX is investigated by observing surface microstructure. The predicted average grain size and volume fraction of the DRX grains are in good agreement with the experimental ones. The results indicate that the pre-stress dry grinding technology can promote DRX nucleation, refine grain size and decrease workpiece surface roughness.
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