Abstract
Shear tests were performed on ultrahigh strength steels under both quasistatic and dynamic conditions, aimed at elucidating the fundamental mechanisms of shear localization underlying both adiabatic shear localization and fracture processes. Experiments were also devised to study the effect of hydrostatic pressure and austenitizing temperature on the critical strain to localization. Experimental evidence strongly suggests that strain localization in the steels investigated is driven by microvoid softening controlled by nucleation at 100 nm scale particles. This is supported by the observed pressure dependence of the instability strain, enhanced resistance to shear instability with particle dissolution, and direct observation of microvoids at these particles in deformed material. For the steels investigated with approximately equivalent strength levels, a direct correlation between the crack extension force and shear instability is demonstrated. Consequently, both fracture toughness and shear localization are dependent on the size, type, and distribution of second phase particles.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
M. Azrin, J. Cowie, and G. Olson:Annals of Israel Physical Society, 1986, vol. 8, pp. 409–17; also Report No. MTL TR 87-2, U.S. Army Materials Technology Laboratory, Watertown, MA, Jan. 1987.
J. Mescall and R. Papirno:Exp. Mech., 1979, vol. 9, pp. 283–311.
J. Cowie and F. Tuler:Mat. Sci. and Eng., 1987, vol. 95, pp. 93–99.
H. Rogers: ARO Technical Report, U.S. Army Research Office, Durham, NC, May 1974.
H. Rogers:Ann. Rev. Mater. Sci., 1979, vol. 9, pp. 283–311.
A. Bedford, A. Wingrove, and K. Thompson:J. Aust. Inst. Metals, 1974, vol. 9, pp. 61–74.
R. Clifton: Report No. NMAB-356, National Materials Advisory Board Committee, Washington, DC, 1980, ch. 8.
A. Argon:The Inhomogeneity of Plastic Deformation, 1st Ed., ASM, Metals Park, OH, 1973, pp. 161–89.
L. Samuels and I. Lamborn: inMetallography in Failure Analysis, 1st ed., Plenum Press, New York, NY, 1978, pp. 167–90.
G. Olson, J. Mescall, and M. Azrin: inShock Waves and High-Strain-Rate Phenomena in Metals Plenum Press, New York, NY, 1981, ch. 14.
T. Walker and M. Shaw: inAdvances in Machine Tool Design and Research, Pergamon Press, New York, NY, 1969, p. 241.
H. Luong: Monash University, Victoria, Australia, unpublished Ph.D. thesis, 1977.
H. Luong:Proceedings of the Australian Conference on Manufacturing Engineering, Monash University, Victoria, Australia, 1977, p. 122.
D. Tracey and P. Perrone: U.S. Army Materials Technology Laboratory, Watertown, MA, unpublished research, 1986.
M. Gore, G. Olson, and M. Cohen:Proceedings of the 34th Sagamore Army Materials Research Conference, in press.
D. Tracey and P. Perrone:Proceedings of the 34th Sagamore Army Materials Research Conference, in press.
A.S. Argon, J. Im, and R. Safoglu:Metall. Trans. A, 1975, vol. 6A, pp. 825–37.
A.S. Argon and J. Im:Metall. Trans. A, 1975, vol. 6A, pp. 839–51.
J. Hutchinson and V. Tvergaard:Proceedings of the 34th Sagamore Army Materials Research Conference, in press.
M. Schmidt and R. Hemphill:Proceedings of the 34th Sagamore Army Materials Research Conference, in press.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Cowie, J.G., Azrin, M. & Olson, G.B. Microvoid formation during shear deformation of ultrahigh strength steels. Metall Trans A 20, 143–153 (1989). https://doi.org/10.1007/BF02647501
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02647501