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Secondary Reaction Zone Formations in Pt-Aluminised Fourth Generation Ni-Base Single Crystal Superalloys
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A Review of the Measurement of Single Crystal Orientation Parameters of Nickel Castings
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A Review of the Measurement of Single Crystal Orientation Parameters of Nickel Castings

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Abstract:

Control of single crystal orientation in modern gas turbine components is a critical quality control issue for optimum reliable behaviour, and an increasingly important aspect of trade. This paper reviews industrial practice for the determination of primary crystal orientation and for the determination of 'disorientation' (R-value) between sub-grains. Different techniques and measurement conventions are compared, and the errors of measurement have been assessed through a European round-robin. Causes of poor reproducibility in 'disorientation' measurement have been identified by EBSD investigations. Recommendations for unified practice have been made in a Good Practice Guide as a precursor to a new industry-wide standard.

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Periodical:

Advanced Materials Research (Volume 278)

Pages:

84-89

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.278.84

Citation:

Cite this paper

Online since:

July 2011

Authors:

K. Clay, P.N. Quested, Roger Morrell, Ken P. Mingard

Keywords:

Back Reflection X-Ray Laue Pattern, Grain Boundary, Misorientation Measurement, Nickel Superalloy, Orientation Measurement, Round Robin, R-Value, Single Crystal

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References

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