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Evaluation of Residual Stresses in Steel-to-Nickel Dissimilar Joints

[+] Author Affiliations
K. Sotoudeh, S. E. Eren, M. Milititsky, M. F. Gittos

TWI Ltd., Great Abington, Cambridge, UK

S. Y. Zhang, S. Kabra

STFC Rutherford Appleton Laboratory, Harwell, Oxford, UK

Paper No. OMAE2013-11192, pp. V003T03A045; 16 pages
doi:10.1115/OMAE2013-11192
From:
  • ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 3: Materials Technology; Ocean Space Utilization
  • Nantes, France, June 9–14, 2013
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5535-5
  • Copyright © 2013 by ASME

abstract

Welds between ferritic and austenitic materials, commonly described as dissimilar metal welds (DMW’s), are widely employed in various industrial applications. Failure of such joint can occur by a variety of failure mechanisms including creep, thermal fatigue and hydrogen embrittlement/corrosion While in some cases, the presence of long range stresses, due to design and fit-up, have been linked to failures, triaxial stress distribution across these types of joints have not adequately been investigated.

In the present work, forged low alloy connectors were buttered with a nickel alloy and post-weld heat treated, before making closing welds to a pipeline steel. The DMW received no further post-weld heat treatment (PWHT). The residual strain profiles across dissimilar joints were measured in the axial, radial and hoop directions of a series of these joints containing multi-run girth welds, using the neutron diffraction technique. Residual stresses were calculated from these measurements. Three dissimilar metal interface combinations were investigated: (1) ASTM A182 F22 steel to ERNiCrMo-3 (alloy 625) weld metal (PWHT’d joint), (2) AISI 8630M steel to ERNiCrMo-3 (alloy 625) weld metal (PWHT’d joint) and (3) ASTM A964-F65 low alloy steel to ERNiCrMo-3 (alloy 625) weld metal without PWHT. The current study attempts to create a better insight into the unique stress distributions across these joints.

Copyright © 2013 by ASME

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