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| Effects of Heat Treatment on Stress Rupture Properties of GH706 Superalloy |
| XIN Xin1, SUN Wenru1, FENG Zhenwei2, QI Feng1, LI Xiaoguang2, YANG Hongcai3, HU Zhuangqi1 |
1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2.Shenyang Liming Aero-Engine Group Corporation. Shenyang 110043
3.School of Materials and Metallurgy, Northeastern University, Shenyang 110004 |
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Cite this article:
XIN Xin SUN Wenru FENG Zhenwei QI Feng LI Xiaoguang YANG Hongcai HU Zhuangqi. Effects of Heat Treatment on Stress Rupture Properties of GH706 Superalloy. Chin J Mater Res, 2010, 24(6): 649-654.
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Abstract The stress rupture properties of GH706 superalloy at diffierent heat treatments are studied in precent work. For two-step treated GH706 alloy, cellular $ particles precipitate closely at the grain boundaries, strengthening grain boundaries, leading to the prolongation of the stress rupture life. In three-step alloy treated, the needle-like η phases are formed at the grain boundaries, which enlarge the area of the depleted zone of the γ' and γ'' strengthening phases. This zone characterizes with poor strength, which deteriorates grain boundaries. Cracks are prone to initate at γ' and γ'' depleted zone, then the cracks are easily to propagate. Consequently, the stress rupture life is reduced. For direct aging (DA) treated alloy, the rod-like η particles precipitate loosely at the grain boundaries, which makes grain boundary strengthening. The free precipitated phase zone is formed between η particles, which can passivates crack
initiation and propagation. This may lead to the longest stress rupture life and the best rupture elongation of the DA GH706 alloy among three kind heat-treated alloys.
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Received: 09 April 2010
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