Residual stress evolution during the manufacture of aerospace forgings.

J. Rolph, M. Preuss, N. Iqbal, M. Hofmann, S. Nikov, M. C. Hardy, M. G. Glavicic, R. Ramanathan, A. Evans

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

6 Citations (Scopus)


The residual stresses present through the quenching, ageing, and machining processes in sub-scale forgings of RR1000 have been measured experimentally using neutron diffraction, and the contour method. The forgings, 88.9mm in diameter, and 25.4-50.8mm thickness, were of small enough geometry to allow neutron strain measurement in 3 directions throughout most of the bulk. The contour method was employed successfully to generate a full 2D map of the hoop stress in the as-aged and machined samples. The two experimental data sets have been shown to agree very well. Finite element modelling predictions based on an experimentally derived heat transfer coefficient (HTC) curve allowed further comparison and generated additional data. Agreement between the experimental and simulated data was found to be reasonable with some discrepancy visible in the axial direction. The water quenching process was found to generate peak stresses up to 1400MPa in the hoop and radial direction, which were relaxed by as much as 700MPa through ageing. Material removal by machining had a less significant impact in most cases, relaxing residual stress by 100-200MPa.

Original languageEnglish
Title of host publicationSuperalloys 2012 - Proceedings of the 12th International Symposium on Superalloys
PublisherJohn Wiley & Sons
Number of pages11
ISBN (Print)9780470943205
Publication statusPublished - 2 Oct 2012
Externally publishedYes
EventInternational Symposium on Superalloys 2012 - Seven Springs, United States of America
Duration: 9 Sep 201213 Sep 2012
Conference number: 12th


ConferenceInternational Symposium on Superalloys 2012
Abbreviated titleSuperalloys 2012
CountryUnited States of America
CitySeven Springs


  • Contour method
  • Finite element modelling
  • Neutron diffraction
  • Nickel superalloy
  • Residual stress

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