A Comparison of Residual Stress Development in Inertia Friction Welded Fine Grain and Coarse Grain Nickel-Base Superalloy |
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Authors: | N Iqbal J Rolph R Moat D Hughes M Hofmann J Kelleher G Baxter P J Withers and M Preuss |
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Affiliation: | (1) School of Materials, University of Manchester, Manchester, M1 7HS, United Kingdom;(2) Institute Laue Langevin, 38042 Grenoble Cedex 9, France;(3) Present address: WMG, IARC, University of Warwick, Coventry, CV4 7AL, United Kingdom;(4) Forschungsneutronenquelle Heinz-Maier Leibniz (FRM II), Technische Universit?t M?nchen, 85747 Garching, Germany;(5) ISIS, STFC, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, OX11 OQX, United Kingdom;(6) Rolls-Royce plc, Derby, DE24 8BJ, United Kingdom;; |
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Abstract: | The effect of the base material microstructure on the development of residual stresses across the weld line in inertia friction
welds (IFWs) of high-strength nickel-base superalloy RR1000 was studied using neutron diffraction. A comparison was carried
out between tubular IFW specimens generated from RR1000 heat treated below (fine grain (FG) structure) and above (coarse grain
(CG) structure) the γ′-solvus. Residual stresses were mapped in the as-welded (AW) condition and, after a postweld heat treatment (PWHT), optimized
for maximum alloy strength. The highest tensile stresses were generally found in the hoop direction at the weld line near
the inner diameter of the tubular-shaped specimens. A comparison between the residual stresses generated in FG and CG RR1000
suggests that the starting microstructure has little influence on the maximum residual stresses generated in the weld even
though different levels of energy must be input to achieve a successful weld in each case. The residual stresses in the postweld
heat treated samples were about 35 pct less than for the AW condition. Despite the fact that the high-temperature properties
of the two parent microstructures are different, no significant differences in terms of stress relief were found between the
FG and CG RR1000 IFWs. Since the actual weld microstructures of FG and CG RR1000 inertia welds are very similar, the results
suggest that it is the weld microstructure and its associated high-temperature properties rather than the parent material
that affects the overall weld stress distribution and its subsequent stress relief. |
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