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Tribology Letters

, 67:4 | Cite as

A Mechanochemical Route to Cutting Highly Strain-Hardening Metals

  • Anirudh Udupa
  • Koushik Viswanathan
  • Jason M. Davis
  • Mojib Saei
  • James B. Mann
  • Srinivasan Chandrasekar
Original Paper
  • 78 Downloads

Abstract

Highly strain-hardening metals such as Al, Ni, and stainless steels, although relatively soft, are well known as being difficult to cut, because of an unsteady and highly redundant mode of plastic deformation—sinuous flow—prevailing during chip formation. This difficulty in cutting is greatly ameliorated, if the workpiece surface ahead of the chip formation region is coated with certain chemical media such as glues, inks, and alcohols that are quite benign. High-speed imaging shows that the media effect a change in the local plastic deformation mode, from sinuous flow to one characterized by periodic fracture—segmented flow. This flow transition, due to a mechanochemical effect, results in significant reduction of deformation forces and energy, often > 50%, thus facilitating the cutting. The effect is mostly pronounced at smaller undeformed chip thickness, typical of finish and semi-finish machining regimes. The quality of the cut surface, as measured by defect density and surface roughness, improves by an order of magnitude, when the media are applied. Furthermore, this surface is relatively strain free in contrast to conventionally machined surfaces. The mechanochemical effect, with a strong coupling to the flow mode, is controllable, with the media showing similar efficacy across different metal systems. The results suggest opportunities for improving performance of machining processes for many difficult-to-cut gummy metals.

Keywords

Metal cutting Ductile-brittle transition Mechanochemical effect Large-strain deformation 

Notes

Acknowledgements

The authors would like to acknowledge support from NSF Grants CMMI 1562470 and DMR 1610094. JMD would like to acknowledge support from the DoD, Naval Surface Warfare Center, Crane Division, under the NISE Program and the DoD SMART Scholarship-for-Service Program.

References

  1. 1.
    Barlow, P.L.: Rehbinder effect in lubricated metal cutting. Nature 211(5053), 1076–1077 (1966)CrossRefGoogle Scholar
  2. 2.
    Bilby, B., Cottrell, A., Smith, E., Swinden, K.: Plastic yielding from sharp notches. Proc. R. Soc. A 279(1376), 1–9 (1964)CrossRefGoogle Scholar
  3. 3.
    Cassin, C., Boothroyd, G.: Lubricating action of cutting fluids. J. Mech. Eng. Sci. 7(1), 67–81 (1965)CrossRefGoogle Scholar
  4. 4.
    Fernandes, P., Jones, D.: Specificity in liquid metal induced embrittlement. Eng. Fail. Anal. 3(4), 299–302 (1996)CrossRefGoogle Scholar
  5. 5.
    Kohn, E.M.: Role of extreme pressure lubricants in boundary lubrication and in metal cutting. Nature 197, 895 (1963)CrossRefGoogle Scholar
  6. 6.
    Latanision, R.M.: Surface effects in crystal plasticity: general overview. In: Latanision, R.M., Fourie, J.T. (eds.) Surface Effects in Crystal Plasticity, pp. 3–48. Nordhoff, Leyden (1977)CrossRefGoogle Scholar
  7. 7.
    Mahato, A., Sundaram, N.K., Yeung, H., Lukitsch, M., Sachdev, A.K., Chandrasekar, S.: Quantitative in situ analysis of deformation in sliding metals: effect of initial strain state. Tribol. Lett. 60(3), 36 (2015)CrossRefGoogle Scholar
  8. 8.
    Montgomery, R.: The effect of alcohols and ethers on the wear behavior of aluminum. Wear 8(6), 466–473 (1965)CrossRefGoogle Scholar
  9. 9.
    Nakayama, K.: The formation of saw-toothed chip in metal cutting. In: Proceedings of International Conference on Production Engineering, pp 572–577 (1974)Google Scholar
  10. 10.
    Rehbinder, P.: New physico-chemical phenomena in the deformation and mechanical treatment of solids. Nature 159, 866–867 (1947)CrossRefGoogle Scholar
  11. 11.
    Rehbinder, P.A., Shchukin, E.D.: Surface phenomena in solids during deformation and fracture processes. Prog. Surf. Sci. 3, 97–188 (1972)CrossRefGoogle Scholar
  12. 12.
    Reynolds O.: Chem News 29, 117-118 (1874); mem. Proceedings of the Literary and Philosophical Society of Manchester 13:93 (1874)Google Scholar
  13. 13.
    Rice, J.R.: Mechanics of brittle cracking of crystal lattices and interfaces. In: Latanision, R.M., Jones, R.H. (eds.) Chem. Phys. Fract., pp. 23–44. Nijhoff, Martinus, Amsterdam (1987)CrossRefGoogle Scholar
  14. 14.
    Rice, J.R., Thomson, R.: Ductile versus brittle behaviour of crystals. Philos. Mag. 29(1), 73–97 (1974)CrossRefGoogle Scholar
  15. 15.
    Robertson, W.D.: Stress Corrosion Cracking and Embrittlement. Wiley, New York (1956)Google Scholar
  16. 16.
    Rostoker, W., McCaughey, J., Markus, H.: Embrittlement by Liquid Metals. Reinhold Pub. Corp., New York (1960)Google Scholar
  17. 17.
    Schneider, G.: Machinability of metals. American Machinist (2009)Google Scholar
  18. 18.
    Shaw, M.C.: Metal Cutting Principles. Oxford University Press, Oxford (2005)Google Scholar
  19. 19.
    Shchukin, E.D.: The influence of surface-active media on the mechanical properties of materials. Adv. Colloid Interface Sci. 123, 33–47 (2006)CrossRefGoogle Scholar
  20. 20.
    Song, J., Curtin, W.: Atomic mechanism and prediction of hydrogen embrittlement in iron. Nat. Mater. 12(2), 145 (2013)CrossRefGoogle Scholar
  21. 21.
    Spikes, H.: The history and mechanisms of ZDDP. Tribol. Lett. 17(3), 469–489 (2004)CrossRefGoogle Scholar
  22. 22.
    Sundaram, N.K., Guo, Y., Chandrasekar, S.: Mesoscale folding, instability, and disruption of laminar flow in metal surfaces. Phys. Rev. Lett. 109(10), 106,001 (2012)CrossRefGoogle Scholar
  23. 23.
    Sundaram, N.K., Mahato, A., Guo, Y., Viswanathan, K., Chandrasekar, S.: Folding in metal polycrystals: microstructural origins and mechanics. Acta Mater. 140, 67–78 (2017)CrossRefGoogle Scholar
  24. 24.
    Suresh, S.: Fatigue of Materials. Cambridge University Press, Cambridge (1998)CrossRefGoogle Scholar
  25. 25.
    Udupa, A., Viswanathan, K., Ho, Y., Chandrasekar, S.: The cutting of metals via plastic buckling. Proc. R. Soc. A 473(2202), 20160863 (2017)CrossRefGoogle Scholar
  26. 26.
    Udupa, A., Viswanathan, K., Saei, M., Mann, J.B., Chandrasekar, S.: Material-independent mechanochemical effect in the deformation of highly-strain-hardening metals. Phys. Rev. Appl. 10(1), 014,009 (2018)CrossRefGoogle Scholar
  27. 27.
    Usui, E., Gujral, A., Shaw, M.C.: An experimental study of the action of \(\text{ CCl }_4\) in cutting and other processes involving plastic flow. Int. J. Mach. Tool Des. Res. 1(3), 187–197 (1961)CrossRefGoogle Scholar
  28. 28.
    Vandana, A., Sundaram, N.K.: Simulation of sinuous flow in metal cutting. Tribol. Lett. 66(3), 94 (2018)CrossRefGoogle Scholar
  29. 29.
    Viswanathan, K., Mahato, A., Yeung, H., Chandrasekar, S.: Surface phenomena revealed by in situ imaging: studies from adhesion, wear and cutting. Surf. Topogr. Metrol. Prop. 5(1), 014,002 (2017a)CrossRefGoogle Scholar
  30. 30.
    Viswanathan, K., Udupa, A., Yeung, H., Sagapuram, D., Mann, J.B., Saei, M., Chandrasekar, S.: On the stability of plastic flow in cutting of metals. CIRP Ann. Manuf. Technol. 66(1), 69–72 (2017b)CrossRefGoogle Scholar
  31. 31.
    Westwood, A., Kamdar, M.: Concerning liquid metal embrittlement, particularly of zinc monocrystals by mercury. Philos. Mag. 8(89), 787–804 (1963)CrossRefGoogle Scholar
  32. 32.
    Williams, J.E., Smart, E.F., Milner, D.R.: Metallurgy of machining. Part 1: basic considerations and the cutting of pure metals. Metallurgia 81(483), 3–10 (1970)Google Scholar
  33. 33.
    Woon, K., Rahman, M., Fang, F., Neo, K., Liu, K.: Investigations of tool edge radius effect in micromachining: a fem simulation approach. J. Mater. Process. Technol. 195(1–3), 204–211 (2008)CrossRefGoogle Scholar
  34. 34.
    Yeung, H., Viswanathan, K., Compton, W.D., Chandrasekar, S.: Sinuous flow in metals. Proc. Natl. Acad. Sci. USA 112(32), 9828–9832 (2015)CrossRefGoogle Scholar
  35. 35.
    Yeung, H., Viswanathan, K., Udupa, A., Mahato, A., Chandrasekar, S.: Sinuous flow in cutting of metals. Phys. Rev. Appl. 8(5), 054,044 (2017)CrossRefGoogle Scholar
  36. 36.
    Zum Gahr, K.H.: Microstructure and Wear of Materials. Elsevier, New York (1987)Google Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Center for Materials Processing and TribologyPurdue UniversityWest LafayetteUSA
  2. 2.Department of Mechanical EngineeringIndian Institute of ScienceBangaloreIndia
  3. 3.Special Warfare and Expeditionary Systems DepartmentNaval Surface Warfare Center, Crane DivisionCraneUSA
  4. 4.Department of Mechanical EngineeringUniversity of West FloridaPensacolaUSA

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