Affiliation:
1. Beijing Institute of Aeronautical Materials (BIAM)
2. Beihang University
3. Xi'an University of Technology
Abstract
In this investigation, 3wt.% Ru was added to a low Cr and high W content superalloy
with a nominal composition of Ni-10Co-1.5Cr-2.0Mo-1.0Nb-5.5Al-1.2Ti-0.1C-0.02B (wt.%) and
both the Ru-free and the Ru-bearing alloys were directionally solidified. The multi-step heat
treatment, thermal exposure and stress rupture test were performed. The results indicate that Ru is a
weak positive segregation element (k’=Cinterdendrite / Cdendrite= 1.03). The solubility of Ru in γ phase
is 30% higher than that of in γ' phase. Ru hardly enters into MC carbides, but can effectively retard
the formation of M6C carbides. Ruthenium reduces the amount of eutectic (γ+γ'), decreases solid
solution temperature of γ' phase, and promotes the rafting tendency of γ/γ' at elevated temperatures.
Ru-bearing alloy possesses rather higher life at 1100°C/118MPa due to decrease of the film-like
M6C carbides. The addition of Ru can inhibit the formation of M6C and eutectic γ', which hinder the
initiation and propagation of cracks.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Reference5 articles.
1. S. Walston et al.: Superalloys 2004, edited by A. Green et al., TMS, PA (2004), p.15.
2. A.C. Yeh et al.: Superalloys 2004, edited by A. Green et al., TMS, PA (2004), p.677.
3. L. Zheng, C.Q. Gu and Y.R. Zheng: Scripta Materialia Vol. 50 (2004), p.435.
4. L.J. Rowland et al.: Superalloys 2004, edited by A. Green et al., TMS, PA (2004), p.697.
5. Liang Zheng: Scripta Materialia Vol. 53 (2005), p.943 Fig. 4. Microstructure of stress ruptured DS samples: (a) Alloy 1, 35. 6h; (b) Alloy 2, 44. 4h.
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