Intragranular precipitation variations in laser deposited Waspaloy due to compositional inhomogeneities

R. J. Moat, M. Karadge, A. J. Pinkerton, A. Deschamps, F. Bley, L. Li, P. J. Withers, M. Preuss

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

2 Citations (Scopus)

Abstract

Laser direct metal Deposition (DMD) has attracted considerable attention in recent years and has been developed for use in the aerospace industry with various high temperature materials. In nickel-base superalloys, due to the processing conditions found in DMD, little precipitation of γ' is seen in the as-deposited condition. In order to recover the mechanical properties local aging is required, which could be undertaken using a defocused laser beam if γ′ precipitation is sufficiently rapid. Detailed characterisation of the γ′ precipitation and coarsening response during aging of DMD Waspaloy has been undertaken. Novel in-situ studies were carried out using small angle synchrotron x-ray scattering (SAXS) for studying precipitation and coarsening of γ′ at various temperatures. For some aging temperatures, two populations of γ′ precipitates coarsening at different rates were found. Detailed ultra high resolution SEM and energy dispersive x-ray spectroscopy (EDS) revealed that the two γ′ populations can be attributed to chemical segregation in the material.

Original languageEnglish
Title of host publicationProperties and Performance of High Temperature Alloys and Coatings 2007 - Proceedings of Symposium held during the 2007 TMS Annual Meeting
Pages77-86
Number of pages10
Publication statusPublished - 2007
Externally publishedYes
EventThe Minerals, Metals & Materials Society Annual Meeting and Exhibition 2007 - Orlando, United States of America
Duration: 25 Feb 20071 Mar 2007
Conference number: 136th

Conference

ConferenceThe Minerals, Metals & Materials Society Annual Meeting and Exhibition 2007
Abbreviated titleTMS Annual 2007
CountryUnited States of America
CityOrlando
Period25/02/071/03/07

Keywords

  • Laser deposition
  • Precipitation
  • SAXS
  • Segregation
  • Waspaloy

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