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Neutron and X-Ray Scattering Studies of the Metallurgical Condition and Residual Stresses in Weldalite Welds

Published online by Cambridge University Press:  06 March 2019

S. Spooner  and
E.B.S. Pardue
S. Spooner
Affiliation:
Oak Ridge National Laboratory, *Oak Ridge, TN 37831
E.B.S. Pardue
Affiliation:
Technology for Energy Corporation Knoxville, TN 37932
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Abstract

Neutron and x-ray scattering methods of residual stress measurement were applied to plasma arc welds made in aluminum-lithium alloy test panels as part of an evaluation of materials for use in welded structures. In the course of these studies discrepancies between x-ray and neutron results from the heat affected zone (HAZ) of the weld were found. Texture changes and recovery from the cold work, indicated in peak widths, were found in the HAZ as well. The consideration of x-ray and neutron results leads to the conclusion that there is a change in solute composition which modifies the d-spacings in the HAZ which affects the neutron diffraction determination of residual stresses. The composition changes give the appearance of significant compressive strains in the HAZ. This effect and sharp gradients in the texture give severe anomalies in the neutron measurement of residual stress. The use of combined x-ray and neutron techniques and the solution to the minimizing of the neutron diffraction anomalies are discussed.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 39: Forty-Fourth Annual Conference on Applications of X-ray Analysis, July 31 - August 4, 1995 , 1995 , pp. 297 - 303
Copyright
Copyright © International Centre for Diffraction Data 1995

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References

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