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材料研究学报  2010, Vol. 24 Issue (6): 649-654    
  研究论文 本期目录 | 过刊浏览 |
热处理制度对GH706高温合金持久性能的影响
信昕1, 孙文儒1, 冯贞伟2, 祁峰1, 李晓光2, 杨洪才3, 胡壮麒1
1.中国科学院金属研究所 沈阳 110016
2.沈阳黎明发动机(集团)责任有限公司 沈阳 110043
3.东北大学材料与冶金学院 沈阳 110004
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
引用本文:

信昕 孙文儒 冯贞伟 祁峰 李晓光 杨洪才 胡壮麒. 热处理制度对GH706高温合金持久性能的影响[J]. 材料研究学报, 2010, 24(6): 649-654.
, , , , , , . Effects of Heat Treatment on Stress Rupture Properties of GH706 Superalloy[J]. Chin J Mater Res, 2010, 24(6): 649-654.

全文: PDF(917 KB)  
摘要: 不同热处理制度对GH706高温合金持久性能影响的研究结果表明, 固溶加低温时效的两段热处理使合金中析出的η相呈胞状紧密排列于晶界, 强化晶界,获得较长的持久寿命。增加稳定化处理的三段热处理合金, 晶界η相以长针状析出, 并在其周围形成γ'、γ''相贫化区, 贫化区强度较低, 弱化了晶界, 使得裂纹易于萌生, 且易于连通形成扩展通道, 降低了持久寿命。直接时效(DA)处理的合金中η相在晶界呈短棒状分散排列, 可以起到强化晶界的作用, 而η相间的无析出区可以钝化裂纹的萌生和扩展, 从而获得最长的持久寿命和最高的持久塑性。
关键词 金属材料GH706高温合金热处理η相持久性能    
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.
Key wordsmetallic materials    GH706 superalloy    heat treatment    &eta    phase    stress rupture properties
收稿日期: 2010-04-09     
ZTFLH: 

TG14

 
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