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材料工程  2016, Vol. 44 Issue (5): 93-100    DOI: 10.11868/j.issn.1001-4381.2016.05.015
  测试与表征 本期目录 | 过刊浏览 | 高级检索 |
气膜孔分布对DD6单晶高温合金持久性能及断裂行为的影响
胡春燕1,2, 刘新灵1,2, 陶春虎1,2, 曹春晓1,2
1. 北京航空材料研究院, 北京 100095;
2. 航空材料检测与评价北京市重点实验室, 北京 100095
Influence of Cooling Holes Distribution on Stress Rupture Property and Fracture Behavior of Single Crystal Superalloy DD6
HU Chun-yan1,2, LIU Xin-ling1,2, TAO Chun-hu1,2, CAO Chun-xiao1,2
1. Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Beijing 100095, China
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摘要 研究在980℃/300MPa条件下不同气膜孔分布对DD6单晶气冷叶片模拟试样持久性能及断裂行为的影响。结果表明:在相同的温度和应力条件下,气膜孔的分布是影响模拟试样持久寿命的主要因素;随着气膜孔排数的增加,持久寿命呈规律性下降,而带1排孔、2排孔试样的持久寿命与不带孔的持久寿命略长。通过断口微观和金相组织观察发现,不带孔试样的断裂方式为微孔聚集型断裂,断口上分布着大量方形小平面特征,断口附近纵剖面上可见明显的心部裂纹;而带气膜孔试样的持久变形主要出现在气膜孔区域,断口整体氧化较严重,方形小平面特征减少,韧窝特征明显增加,断口附近纵剖面上气膜孔处均可见裂纹及氧化形貌。基于晶体塑性理论分析了不同孔分布下孔边应力的分布规律,模拟结果显示在气膜孔周边存在应力集中和应力重分布,数值模拟分析结果与试样的断裂位置及形貌吻合。
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胡春燕
刘新灵
陶春虎
曹春晓
关键词 DD6单晶高温合金气冷叶片气膜孔持久性能断裂行为    
Abstract:The influence of different cooling holes distribution on stress rupture property and fracture behavior of air-cooled turbine blades modeling specimens of single crystal superalloy DD6 at 980℃/300MPa was analyzed. The results show that cooling holes distribution is the main factor affecting the stress rupture life at the same temperature and stress conditions. The stress rupture life of modeling specimens declines regularly as rows of cooling holes increase, however, the stress rupture life of modeling specimens with one row cooling holes or two rows cooling holes is slightly longer than that without cooling holes. Based on fracture surface and metallurgical observations, the specimens without cooling holes fracture in the mode of microvoid coalescence. The fracture surface is made up of small square-shaped facets and there are heart checks near the fracture surfaces of the specimens,but for the specimens with cooling holes, the fracture cracks initiate from the cooling holes and stress rupture deformation concentrates on the region near cooling holes. The whole fracture surface oxidizes seriously and the small square-shaped facets reduce, dimples increase. In addition, there are cracks and oxidization characteristics near the fracture surfaces of the specimens. Based on the crystal plasticity theory, the distribution of stress along cooling holes is obtained. The simulated results show that stress concentration and redistribution occur around the cooling holes, and the form of the fracture surface is consistent with numerical analysis.
Key wordssingle crystal superalloy DD6    air-cooled blade    cooling hole    stress rupture property    fracture behavior
收稿日期: 2015-01-13      出版日期: 2016-05-19
中图分类号:  TG132.3  
通讯作者: 胡春燕(1983-),女,博士研究生,现从事金属材料失效分析及安全评估等方面的研究,联系地址:北京市81信箱4分箱(100095),E-mail:fachcy@163.com     E-mail: fachcy@163.com
引用本文:   
胡春燕, 刘新灵, 陶春虎, 曹春晓. 气膜孔分布对DD6单晶高温合金持久性能及断裂行为的影响[J]. 材料工程, 2016, 44(5): 93-100.
HU Chun-yan, LIU Xin-ling, TAO Chun-hu, CAO Chun-xiao. Influence of Cooling Holes Distribution on Stress Rupture Property and Fracture Behavior of Single Crystal Superalloy DD6. Journal of Materials Engineering, 2016, 44(5): 93-100.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.05.015      或      http://jme.biam.ac.cn/CN/Y2016/V44/I5/93
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