Study on the residual stress relaxation in girth-welded steel pipes under bending load using diffraction methods

Nico Hempel, Jeffrey R. Bunn, Thomas Nitschke-Pagel, E. Andrew Payzant, Klaus Dilger

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

This research is dedicated to the experimental investigation of the residual stress relaxation in girth-welded pipes due to quasi-static bending loads. Ferritic-pearlitic steel pipes are welded with two passes, resulting in a characteristic residual stress state with high tensile residual stresses at the weld root. Four-point bending is applied to generate axial load stress causing changes in the residual stress state. These are determined both on the outer and inner surfaces of the pipes, as well as in the pipe wall, using X-ray and neutron diffraction. Focusing on the effect of tensile load stress, it is revealed that not only the tensile residual stresses are reduced due to exceeding the yield stress, but also the compressive residual stresses for equilibrium reasons. Furthermore, residual stress relaxation occurs both parallel and perpendicular to the applied load stress.

Original languageEnglish
Pages (from-to)289-300
Number of pages12
JournalMaterials Science and Engineering: A
Volume688
DOIs
StatePublished - Mar 14 2017

Keywords

  • Neutron scattering
  • Residual stresses
  • Steel
  • Welding
  • X-ray diffraction

Fingerprint

Dive into the research topics of 'Study on the residual stress relaxation in girth-welded steel pipes under bending load using diffraction methods'. Together they form a unique fingerprint.

Cite this