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Analysis of residual stress and work-hardened profiles on Inconel 718 when face turning with large-nose radius tools

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Abstract

Surface integrity (SI) and, particularly, the residual stress profile, has a great influence on the fatigue life of machined aeronautical critical parts. Among the different cutting parameters that affect the final SI, tool geometry is one of the most important factors. In particular, tool nose radius determines the surface roughness, as well as the thermoplastic deformation of the workpiece. Indeed, the use of large tool nose radius in the industry enables (1) increasing the feed rate while keeping the roughness values below specifications and (2) reducing the influence of the tool wear in the surface roughness. Therefore, in this study, the influence of tool nose radius in the induced residual stress profile and work-hardened layer when face turning Inconel 718 is analysed for a cutting speed range between (30–70 m/min) and a feed rate range of (0.15–0.25 mm/rev). For this purpose, residual stress profiles and work-hardened layer were measured by x-ray diffraction method after machining with a 4 mm nose radius. Then, results have been compared against different tool nose radius studies carried out by other authors for the specified working conditions. Results revealed that residual stress profiles varied when machining with different nose radius for the studied range. In particular, the increase of the nose radius brought to a higher difference between surface tensile stress and subsurface compressive peak stress, which is attributed to an increase of the thermal effect. Moreover, thicker work-hardened layer (around 100 μm) was observed when machining with large-nose radius for the studied working conditions.

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Authors and Affiliations

  1. Mechanical and Industrial Production Department, Faculty of Engineering, Mondragon Unibertsitatea, Loramendi 4, 20500, Mondragon, Spain

    A. Madariaga, J. A. Esnaola, E. Fernandez, P. J. Arrazola & A. Garay

  2. Arts et Métiers ParisTech, Angers, 49035, France

    F. Morel

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  1. A. Madariaga
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  2. J. A. Esnaola
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  3. E. Fernandez
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  4. P. J. Arrazola
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  5. A. Garay
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  6. F. Morel
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Correspondence to A. Madariaga.

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Madariaga, A., Esnaola, J.A., Fernandez, E. et al. Analysis of residual stress and work-hardened profiles on Inconel 718 when face turning with large-nose radius tools. Int J Adv Manuf Technol 71, 1587–1598 (2014). https://doi.org/10.1007/s00170-013-5585-6

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  • DOI: https://doi.org/10.1007/s00170-013-5585-6

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