A Study of the Effects of Alloying Additions on TCP Phase Formation in 4th Generation Nickel-Base Single-Crystal Superalloys

Rae, Catherine M.F.; Stone, Howard J.; Pang, H.T.; Hobbs, R.A.

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Paper Titles

Dissolution of Fine γ’ Precipitates of MC2 Ni-Based Single-Crystal Superalloy in Creep-Fatigue Regime, p.31
Diffraction Profile, Strain Distribution and Dislocation Densities during Stage II Creep of a Superalloy, p.37
In Situ Investigation with Neutrons on the Evolution of γ ' Precipitates at High Temperatures in a Single Crystal Ni-Base Superalloy, p.42
In Situ Measurement of Internal Stresses and Strain Rates by High Energy X-Ray Diffraction during High Temperature Mechanical Testing, p.48
A Study of the Effects of Alloying Additions on TCP Phase Formation in 4^th Generation Nickel-Base Single-Crystal Superalloys, p.54
Lattice Misfit of High Refractory Ruthenium Containing Nickel-Base Superalloys, p.60
Characterization of Single-Crystal Dendrite Structure and Porosity in Nickel-Based Superalloys Using X-Ray Micro-Computed Tomography, p.66
Effect of HIP Parameters on the Micro-Structural Evolution of a Single Crystal Ni-Based Superalloy, p.72
Secondary Reaction Zone Formations in Pt-Aluminised Fourth Generation Ni-Base Single Crystal Superalloys, p.78

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Paper Title:

A Study of the Effects of Alloying Additions on TCP Phase Formation in 4^th Generation Nickel-Base Single-Crystal Superalloys

Periodical	Advanced Materials Research (Volume 278)
Main Theme	Euro Superalloys 2010
Edited by	M. Heilmaier
Pages	54-59
DOI	10.4028/www.scientific.net/AMR.278.54
Citation	H.T. Pang et al., 2011, Advanced Materials Research, 278, 54
Online since	July, 2011
Authors	H.T. Pang, R.A. Hobbs, Howard J. Stone, Catherine M.F. Rae
Keywords	Ruthenium, Superalloy, Topologically Closed-Packed (TCP) Phases

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Abstract

The demand for higher engine operating temperatures to improve aeroengine efficiency has meant that increasing levels of alloying additions are being added to single-crystal nickel-base superalloys for turbine blades applications. Whilst better mechanical and environmental performance may be obtained with these alloying additions, they also destabilise the alloys forming topologically closed-packed (TCP) phases. In this study, the formation of TCP phases has been studied in a series of four alloys designated LDSX1-4 which have a systematic variation in the levels of Co, Mo and W. The alloys were exposed to elevated temperatures between 900-1100°C for up to 1000 hours. This was followed by detailed analysis of the microstructures in the SEM. Identification of the TCP phases in selected alloys was also carried out. The effects of each alloying addition on TCP phase formation is discussed in light of these results.