Frontiers of Mechanical Engineering >
Microstructure investigation of dynamic recrystallization in hard machining: From thermodynamic irreversibility perspective
Received date: 10 Jul 2020
Accepted date: 14 Sep 2020
Published date: 15 Jun 2021
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The drastically changed thermal, mechanical, and chemical energies within the machined surface layer during hard machining tend to initiate microstructural alteration. In this paper, attention is paid to the introduction of thermodynamic potential to unravel the mechanism of microstructure evolution. First, the thermodynamic potential-based model expressed by the Helmholtz free energy was proposed for predicting the microstructure changes of serrated chip and the machined surface layer. Second, the proposed model was implemented into a validated finite element simulation model for cutting operation as a user-defined subroutine. In addition, the predicted irreversible thermodynamic state change in the deformation zones associated with grain size, which was reduced to less than 1 mm from the initial size of 1.5 mm on the machined surface, was provided for an in-depth explanation. The good consistency between the simulated results and experimental data validated the efficacy of the developed model. This research helps to provide further insight into the microstructure alteration during metal cutting.
Binxun LI , Xinzhi ZHANG , Song ZHANG . Microstructure investigation of dynamic recrystallization in hard machining: From thermodynamic irreversibility perspective[J]. Frontiers of Mechanical Engineering, 2021 , 16(2) : 315 -330 . DOI: 10.1007/s11465-020-0612-4
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