Surface and Bulk Residual Stress in Ti6Al4V Welded Aerospace Tanks

[+] Author and Article Information
G. Bruno

Institute Laue-Langevin, BP 156, F-38042 Grenoble, France

B. D. Dunn

European Space Agency, ESTEC, 2200 AG Noordwjik, The Netherlands

J. Pressure Vessel Technol 126(3), 284-292 (Aug 18, 2004) (9 pages) doi:10.1115/1.1763932 History: Received March 13, 2003; Revised March 26, 2004; Online August 18, 2004
Copyright © 2004 by ASME
Topics: Stress , Neutrons , X-rays
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Sketch of the sample shape and sizes. Measurement points and the cut made to extract smaller samples are also indicated
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Etched cross sections reveal local microstructure variations: (a) the weld pool consists of very large grains, mainly β-phase that has transformed to acicular martensite; (b) the HAZ has the same microstructure, with an intermediate grain size, whereas (c) the parent metal is a mixed structure of globular and small equiaxed α and β fine grains.
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X-Ray diffraction spectrum obtained with Cu radiation and PSD in the parent material of sample X1 (as-welded)
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Typical neutron diffraction spectrum around 2θ=90 deg. (210) peak results in low intensity and thus was not used for RS analysis. The spectrum was taken in the parent material of sample X1.
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Examples of d versus sin2 ψ curves (fitted with straight lines) for α (a) and β-phase (b) in X1 sample. Both are taken for φ=90°, transversal (axial or x direction). Positive and negative ψ values are displayed with different marks.
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The d0 profile across one of the welds for the α-phase of sample X1, as measured in two successive runs at HMI, X-ray facility
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Transversal (a) and longitudinal (b) (x and y, respectively) stresses for α and β-phases as measured in sample X1, together with the macro-RS, as calculated from Eq. (2). In the second case the dashed line is a model curve to data, while in the (a) lines are just guides for the eye.
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Stresses for α-phase of X2 sample. High compressive values are reached far from weld on the upper (front, convex) side. The stresses on the neutral axis are evaluated as the arithmetic average of the front and back values. Errors are shown only for the “neutral axis” values, but have the same order of magnitude for all points. The fitting curve (Masubuchi function) is also shown thick-dashed.
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Stresses (longitudinal and transversal) for the β-phase of the front face of sample X2. As in the α-phase large negative stresses are present far from weld.
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Stresses for sample X1 evaluated using neutron diffraction on the (203) and (211) peak, (a) and (b), respectively. The fitting curve for σy is also shown.
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Stresses for sample X1 evaluated using neutron diffraction on the (203) and (211) peak, (a) and (b), respectively. The fitting line with the Masubuchi-Martin function is also shown.




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