Residual stress ANALYSIS in linear friction welded in-service inconel 718 superalloy via neutron diffraction and contour method approaches

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DOIResolve DOI: http://doi.org/10.1016/j.msea.2017.03.038
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TypeArticle
Journal titleMaterials Science and Engineering: A
ISSN0921-5093
Subjectinconel 718 superalloy; in-service repair; residual stress; neutron diffraction; contour method
AbstractIn this study, an analysis of elastic residual stress in Inconel® 718 (IN 718) linear friction welds (LFWs) was carried out. In particular, the suitability of LFW for manufacturing and repair of aero engine components was emulated by joining virgin and in-service (extracted from a turbine disk) materials. The evolution in the residual strains and stresses in the heat-affected zone (HAZ), thermomechanically affected zone (TMAZ) and dynamically recrystallized zone (DRX) of the weld was characterized using the neutron diffraction and contour methods. The results provided insight into diverse challenges in quantitative analysis of residual stresses in welded IN 718 using diffraction techniques. Specifically, judicious selection of the beam width, height and stress-free lattice spacing were seen to be crucial to minimize measurement error and increase accuracy. Further, the contour method – a destructive technique relying on capturing the stress relaxation after electrical discharge machining – was used to characterize the residual stress distribution on two-dimensional plane sections of the welds. Both techniques suggested an increasing magnitude of residual stress originating from the base metal that reached a peak at the weld interface. Both methods indicated that the peak magnitude of residual stresses were below the yield stress of IN 718.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationAerospace; National Research Council Canada
Peer reviewedYes
NPARC number23001616
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Record identifierb94684a8-5da5-45ac-8aee-22b9324ffdfc
Record created2017-03-13
Record modified2017-03-13
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