Skip to main content
Article thumbnail
Location of Repository

Microstructural analysis of creep exposed IN617 alloy

By Ram Krishna, Sarah V. Hainsworth, Helen V. Atkinson and A. Strang


Nickel base alloys such as IN617 are one of the preferred choices for steam turbine components used by fossil fuelled power generation plants. IN617 is a solid-solution-strengthened nickel-based superalloy containing ~23% Cr, 12% Co, and 9% Mo with low content of precipitation-strengthening elements Al, Ti and Nb. In the ‘as-received’ (solution-annealed condition), the microstructure consists of primary carbides (M23C6) and occasional TiN particles dispersed in a single-phase austenitic matrix. Owing to high temperature exposure and the creep deformation processes that occur in-service, evolution of the microstructure occurs. This results in secondary precipitation and precipitate coarsening, both on grain boundaries and intragranularly in areas of high dislocation density. The influence of creep deformation on the solution-treated IN617 alloy at an operating condition of 650˚C/574 Hrs, with emphasis on the morphology and distribution of carbide/nitride precipitation is discussed. The applied stress was at an intermediate level

Topics: IN617, solid-solution strenghtening, hardness, intergranular fracture, precipitates, microstructural stability, FEGSEM, TEM
Publisher: Maney publishing
Year: 2009
DOI identifier: 10.1179/026708309X12584564052094
OAI identifier:

Suggested articles


  1. (1996). 18) ASTM Standard E112-95, 03.01(1996): Standard test methods for determining average grain size,
  2. (2007). 89-97. 7) G.W. Meetham: High Temperature Alloys for Gas Turbines and Other Applications,
  3. (1999). Davis & Associates (Eds.): Heat Resistant Materials,
  4. (2005). DEStech Publications,
  5. (2005). Engineering Failure Analysis, doi
  6. (2003). Materials Science and Engineering: A, doi
  7. (2008). Metallurgical and Materials Transactions A, doi
  8. (1980). Metallurgical Transactions A, doi
  9. (1972). Metals Engineering Quarterly,
  10. (2003). Rösler: Scripta Materialia,

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.