低Re含量第二代柱晶高温合金DZ59的蠕变断裂性能

材料研究学报

2009, Vol. 23

Issue (2): 158-164

研究论文

本期目录 | 过刊浏览

低Re含量第二代柱晶高温合金DZ59的蠕变断裂性能

赵坦^1;2; 张匀²; 陈光¹; 楼琅洪²

1.南京理工大学南京 210094
2.中国科学院金属研究所沈阳110016

The creep rupture properties of a low Re content second-generation directionally solidified superalloy DZ59

ZHAO Tan^1;2; ZHANG Yun²; CHEN Guang¹; LOU Langhong²

1.School of Materials Science and Engineering; Nanjing University of Science and Technology; Nanjing 210094
2.Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016

引用本文:

赵坦张匀陈光楼琅洪. 低Re含量第二代柱晶高温合金DZ59的蠕变断裂性能[J]. 材料研究学报, 2009, 23(2): 158-164.
, , . The creep rupture properties of a low Re content second-generation directionally solidified superalloy DZ59[J]. Chin J Mater Res, 2009, 23(2): 158-164.

全文: PDF(1379 KB)

摘要:

采用液态金属冷却(LMC)工艺和成分优化设计, 制备出一种高温性能优异的低Re含量第二代柱晶高温合金DZ59, 通过扫描电镜(SEM), 透射电镜(TEM)等方法对其组织特征及蠕变断裂进行了表征, 研究了合金的蠕变断裂性能. 结果表明, DZ59合金的高温蠕变断裂性能超过一代单晶合金, 并接近二代单晶合金的水平. 发现柱晶高温合金的二次晶界反应(SGRZ)现象, 表明SGRZ受温度和应力的控制, 由于增加了合金横向晶界的受力界面, 在高负荷下可能成为蠕变空洞萌生和扩展的位置.

关键词 ：金属材料, 第二代定向柱晶, 蠕变断裂, 二次晶界反应区, 拓扑密排相(TCP)

Abstract：

Assisted by the advanced LMC process and an optimum composition design, a highperformance second-generation directionally solidified superalloy DZ59 with low Re content has been developed. The high temperature creep properties of the superalloy are better than first-generation single crystal alloys and is close to the level of second-generation single crystal alloys. The microstructure and creep rupture feature of the DZ59 alloy have been analysed in detail by SEM and TEM. The SGRZ was first discovered in the second-generation directionally solidified superalloys. The results showed that SGRZ is controlled by the temperature and stress. Because SGRZ increases the area of transverse grain boundary, creep voids may initiate and propagate in the SGRZ location under high stress.

Key words： metallic materials 2nd generation DS superalloy creep rupture second grain reaction zone(SGRZ) TCP phase

收稿日期: 2008-10-17

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