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Modeling nanostructural surface modifications in metal cutting by an approach of thermodynamic irreversibility: Derivation and experimental validation

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Abstract

Performance and operational safety of many metal parts in engineering depend on their surface integrity. During metal cutting, large thermomechanical loads and high gradients of the loads concerning time and location act on the surfaces and may yield significant structural material modifications, which alter the surface integrity. In this work, the derivation and validation of a model of nanostructural surface modifications in metal cutting are presented. For the first time in process modeling, initiation and kinetics of these modifications are predicted using a thermodynamic potential, which considers the interdependent developments of plastic work, dissipation, heat conduction and interface energy as well as the associated productions and flows of entropy. The potential is expressed based on the free Helmholtz energy. The irreversible thermodynamic state changes in the workpiece surface are homogenized over the volume in order to bridge the gap between discrete phenomena involved with the initiation and kinetics of dynamic recrystallization and its macroscopic implications for surface integrity. The formulation of the thermodynamic potential is implemented into a finite element model of orthogonal cutting of steel AISI 4140. Close agreement is achieved between predicted nanostructures and those obtained in transmission electron microscopical investigations of specimen produced in cutting experiments.

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Authors and Affiliations

  1. Laboratory of Machine Tools And Production Engineering (WZL), RWTH Aachen University, Steinbachstr. 19, 52074, Aachen, Germany

    S. Buchkremer & F. Klocke

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  1. S. Buchkremer
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Correspondence to S. Buchkremer.

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Communicated by Andreas Öchsner.

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Buchkremer, S., Klocke, F. Modeling nanostructural surface modifications in metal cutting by an approach of thermodynamic irreversibility: Derivation and experimental validation. Continuum Mech. Thermodyn. 29, 271–289 (2017). https://doi.org/10.1007/s00161-016-0533-y

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  • DOI: https://doi.org/10.1007/s00161-016-0533-y

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