Paper Titles
New Phases in a Multicomponent High Ruthenium Single Crystal Superalloy
p.655
Roll Bonding and the Application in Making FeCrAl Alloy
p.661
Interface Morphologies and Microstructure of a Single Crystal Superalloy under High Thermal Gradient Directional Solidification
p.665
Effect of Ta on the Oxidation Resistance of a Cast Nickel-Base Die Material with Low Cr and High W Content
p.669
Precipitation Behavior during Ageing Treatment of a Single Crystal Nickel-Base Superalloy
p.673
Room Temperature Deformation Behavior of Inconel718
p.677
Mechanical Behaviour of a Single Crystal Superalloy DD32 - A Comparison with the Alloy SRR99
p.681
Effect of Chromium on the Oxidation of a Fe-10 Al Alloy at 1000°C
p.685
The Control of Microstructures in (Mo1-x, Nbx) Si2 Intermetallics
p.689

Precipitation Behavior during Ageing Treatment of a Single Crystal Nickel-Base Superalloy

Article Preview

Abstract:

The precipitation behavior during ageing treatment of a single crystal nickel-base superalloy was investigated by SEM and TEM. The results showed that tetragonal needle-like σ phase and blocky -W phase precipitated during low temperature ageing treatment after this testing alloy was completely solution heat treated. σ and -W phases robbed of solid solution strengthening alloying element W、Mo in the matrix and degraded high temperature creep rupture property severely. The creep curve of the crystal tested at 1010 °C and 248 MPa exhibited that the steady state creep rate ε was as high as 9.46 × 10-3/h. The creep-rupture life was only 25 hours. -W phase was not formed by decrease of W content properly. A relatively low level of Co could inhibit σ phase precipitation and improve microstructural stability.

You might also be interested in these eBooks
PRICM-5 View Preview

Info:

Periodical:

Materials Science Forum (Volumes 475-479)

Pages:

673-676

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.475-479.673

Citation:

Cite this paper

Online since:

January 2005

Authors:

D.Y. Yang, Tao Jin, Na Ru Zhao, Zhi Wang, Xiao Feng Sun, Heng Rong Guan, Zhuang Qi Hu

Keywords:

Aging Treatment (AT), Alloying Element, Single Crystal Nickel-Base Superalloy, α-W Phase, σ Phase

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2005 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] Q.Y. Huang and H.K. Li: Superalloy (Metallurgy Industry Press, Beijing 2000), p.2

Google Scholar

[2] C.M.F. Rae, M.S.A. Karunaratne, C.J. Small, R.M. Broomfield, C.N. Jones and R.C. Reed: Superalloys 2000 (The Minerals, Metals & Materials Society, New York 2000), p.767

Google Scholar

[3] T.M. Pollock: Mater. Sci. Eng. Vol. 32B (1995), p.255

Google Scholar

[4] A.F. Giamei and D.L. Anton: Metall. Trans. Vol. 16A (1985), p. (1997)

Google Scholar

[5] R. Darolia, D.F. Lahrman, R.D. Fiele and R. Sisson: Superalloys 1988 (The Metallurgical Society, New York 1988), p.255

Google Scholar

[6] G.L. Chen: Superalloy (Metallurgy Industry Press, Beijing 1988), p.167

Google Scholar

[7] G.L. Erickson: Superalloys 1996 (The Minerals, Metals & Materials Society, New York 1996), p.35

Google Scholar

[8] Y.R. Zheng and D.T. Zhang: Color Metallographic Investigation of Superalloys and Steels (Defence Industry Press, Beijing 1999), p.197 1µm Fig.6 Microstructure of the new alloy after ageing at 870 ℃ for 500h

Google Scholar