Post-Weld Heat Treatment Stress Relaxation in Zircaloy 4 Plasma Welds

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We have studied the effect of a post-weld heat treatment on plasma arc welds on Zircaloy 4 plates. The samples consist of two 100 mm long, 50 mm wide, and 6.25 mm thick plates, welded along the rolling (longitudinal) direction. The heat-treatment consisted of a steady increase in temperature from room temperature to 450oC over a period of 4.5 hours; followed by cooling with an equivalent cooling rate. Residual strains and stresses along the longitudinal, transverse and normal directions on an as-welded and a heat-treated specimen were measured by neutron diffraction on the ENGIN-X beamline at the Isis Facility, Rutherford Laboratory, UK. Peak tensile stresses of (105±25) MPa were found in the as-welded specimen, which were reduced to (70±20) MPa after the heat-treatment. Thermal compressive stresses of (-80±20) MPa were found along the normal direction, which were not affected by the heat treatment. The use of a full-pattern Rietveld refinement for the determination of bulk strains in Zircaloy specimens is also discussed.

Info:

Periodical:

Materials Science Forum (Volumes 524-525)

Edited by:

W. Reimers and S. Quander

Pages:

491-496

DOI:

10.4028/www.scientific.net/MSF.524-525.491

Citation:

J. R. Santisteban et al., "Post-Weld Heat Treatment Stress Relaxation in Zircaloy 4 Plasma Welds", Materials Science Forum, Vols. 524-525, pp. 491-496, 2006

Online since:

September 2006

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$35.00

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