Paper Title:
Microstructure and High Temperature Stress Rupture Properties of Ru-Containing Directionally Solidified Ni-Base Superalloy
  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.

  Info
Periodical
Key Engineering Materials (Volumes 353-358)
Edited by
Yu Zhou, Shan-Tung Tu and Xishan Xie
Pages
507-510
DOI
10.4028/www.scientific.net/KEM.353-358.507
Citation
L. Zheng, S. S. Li, C. B. Xiao, D. Z. Tang, C. Q. Gu, "Microstructure and High Temperature Stress Rupture Properties of Ru-Containing Directionally Solidified Ni-Base Superalloy", Key Engineering Materials, Vols. 353-358, pp. 507-510, 2007
Online since
September 2007
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