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In-Situ Neutron Diffraction Study of the Behavior of AL6XN Stainless Steel Under Biaxial Loading

  • Michael Gharghouri (a1), Tito Marin (a2), Ronald B Rogge (a3) and Paul R Dawson (a4)

Abstract

In–situ neutron diffraction has been used to measure lattice strains parallel to two principal stress directions in biaxially-loaded AL6XN stainless steel. A new fixture was developed for loading thin-walled tubular specimens through combinations of internal pressure and axial loading. Under these conditions, the principal directions (σzz and σθθ in a cylindrical r, θ, z coordinate system) remain constant with respect to the initial crystallographic texture regardless of the level of biaxiality, a distinct advantage for diffraction experiments over the traditional tension/torsion tests for which this condition does not hold. Specimens were first pressurized to the level required to obtain a chosen value of σθθ. The axial load was then increased to reach the yield surface at different σθθzz ratios, ranging from uniaxial to balanced biaxial loading (0, 0.4, 0.7, 1 according to Tresca). The {200}, {220}, {222}, and {311} reflections were measured in the axial and hoop directions as a function of axial load. A sequence of axial loading/unloading episodes was applied for different levels of plastic deformation. Under uniaxial tension, the {200} reflection showed the highest axial strains, followed by the {311}, and {220}/{222} reflections. With increasing internal pressure (biaxiality), the axial lattice strains corresponding to a given axial stress tended to decrease, and the responses of the various reflections tended to merge.

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1. Dawson, P. R., Boyce, D. E., and Rogge, R. B., Mater. Sci. Eng. 399A, 13 (2005)
2. Holden, T. M., Holt, R. A., and Pang, J. W. L., Metall. Mater. Trans., 33A, 749 (2002)10.1007/s11661-002-0141-2
3. Rangaswamy, P., Bourke, M. A. M., Brown, D. W., Kaschner, G. C., Rogge, R. B., Stout, M. G., and Tome, C. N., Metall. Mater. Trans., 33A, 757 (2002)10.1007/s11661-002-0142-1
4. Dawson, P., Boyce, D., MacEwen, S., and, Rogge, R., Mater. Sci. Eng., 313A, 123 (2001)10.1016/S0921-5093(01)00967-4
5. Hutchings, M. T., Withers, P. J., Holden, T. M., and Lorentzen, T., Introduction to the Characterization of Residual Stress by Neutron Diffraction, (Taylor and Francis, 2005) p. 50

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