Neutron diffraction measurements of residual stresses in a weldment
- and others
Neutron diffraction is a powerful, nondestructive method for obtaining three-dimensional, spatial maps of residual stress within intact weldments. This paper presents the first complete mapping of residual stresses in a multipass, GTA-welded, ferritic-steel plate. A `classic` pattern of residual stress was observed. The major component of stress was parallel to the long dimension of the weld. This longitudinal stress exhibited a tensile peak of +(500 {plus_minus} 20) MPa at the weld center and a monotonic decrease through zero, about 50 mm from the weld center, to a compressive value of -(150 {plus_minus} 20 MPa) towards the edge of the weldment, far from the fusion zone. The experimental data on residual stresses, obtained by neutron diffraction, are uniquely well-suited for comparison with finite-element calculations and models of weldments. The spatial resolution and practical limitations on the number of sampling positions are approximately the same for the two methods. The distribution of residual stresses observed by newtron diffraction from a multipass ferritic-steel weldment can be explained qualitatively on the basis of inhomogeneous yield during cooling of the weldment. For a quantitative understanding of the residual stresses in the weldment, the results of finite-element analyses must be compared with the neutron diffraction data.
- OSTI ID:
- 115451
- Report Number(s):
- CONF-9404233--
- Country of Publication:
- United States
- Language:
- English
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