4.5 Article

On modelling the influence of thermo-mechanical behavior in chip formation during hard turning of 100Cr6 bearing steel

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CIRP ANNALS-MANUFACTURING TECHNOLOGY
卷 50, 期 1, 页码 31-36

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ELSEVIER
DOI: 10.1016/S0007-8506(07)62064-2

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hard turning; work hardening; thermal softening

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This paper deals with turning of hardened alloy steels (up to HV800). First, the research focuses on the evaluation of flow stress in machining of 100Cr6 (AISI 52100) bearing steel. A material constitutive law including work hardening, thermal softening, and strain-rate sensitivity has been looked for. The work hardening effect has been determined with the help of quasi-static compression tests performed on standard test specimens. The dynamic compression tests performed at high strain-rates using the Hopkinson bars, have shown no tendency to viscosity effects. Hot compression tests show that thermal softening plays a significant role in the the process feasibility. Cutting tests performed under various cutting conditions have highlighted the conflicting work hardening-thermal softening processes. This balance is discussed with a shear instability criterion, presenting the work hardening to thermal softening ratio through a revised material behavior law.

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