Influence of Co, W and Ti on the Stress-rupture Lives of a Single Crystal Nickel-base Superalloy

J Mater Sci Technol ›› 2006, Vol. 22 ›› Issue (02): 169-172.

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Influence of Co, W and Ti on the Stress-rupture Lives of a Single Crystal Nickel-base Superalloy

Dayun YANG, Tao JIN, Nairen ZHAO, Zhihui WANG, Xiaofeng SUN, Hengrong GUAN, Zhuangqi HU

Department of Superalloy, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received:2005-03-23 Revised:2005-06-06 Online:2006-03-28 Published:2009-10-10
Contact: Dayun YANG

Abstract

Abstract: The influence of Co, W and Ti on stress-rupture lives of a Ni-Cr-Al-Mo-Ta-Co-W-Ti single crystal nickel-base superalloy has been investigated using a L9 (34) orthogonal array design (OAD) by statistical analysis. At a selected composition range, Ti content was the most important factor to the effect of the stress-rupture lives and then followed by Co content. W content had the minimum effect on stress-rupture lives. The optimal alloy should contain 10 wt pct Co, 8 wt pct W and zero Ti. The optimized alloy also had good microstructural stability during thermal exposure at 870℃ for 500 h.

Key words: Nickel-base single crystal superalloy, Orthogonal array design, Stress-rupture

Dayun YANG, Tao JIN, Nairen ZHAO, Zhihui WANG, Xiaofeng SUN, Hengrong GUAN, Zhuangqi HU. Influence of Co, W and Ti on the Stress-rupture Lives of a Single Crystal Nickel-base Superalloy[J]. J Mater Sci Technol, 2006, 22(02): 169-172.

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Influence of Co, W and Ti on the Stress-rupture Lives of a Single Crystal Nickel-base Superalloy

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