摘要
在650℃下,对GH3535合金的蠕变裂纹扩展行为进行研究,得到了蠕变裂纹起裂时间ti、蠕变裂纹扩展速率da/dt和有效应力强度因子Kn、断裂参量C*的关系曲线,以及蠕变断裂韧性Kmat^c和蠕变裂纹起裂时间ti的关系,并与NSW裂纹扩展模型、Ainsworth蠕变断裂韧性预测结果进行比较,分析GH3535合金的容限能力。结果表明,蠕变裂纹扩展速率适合采用断裂参量C*进行关联,NSW模型平面应力预测结果与试验相近,平面应力预测结果偏于保守。采用Kn更适合关联蠕变裂纹起裂时间ti,在双对数坐标下Kn与ti呈线性关系。蠕变断裂韧性Kmat^c随时间ti增加而降低,Ainsworth估算方法略高于测试结果。从有效应力强度因子和蠕变强度的Ashby图中可以看出,GH3535合金具有较好的容限能力。
The creep crack growth behavior of GH3535 alloy was studied at 650 ℃ . The relationship between creep crack initiation time ti,creep crack growth rate da/dt and effective stress intensity factor Kn and fracture parameter C*,and the relationship between creep fracture toughness Kmatvs^c. tiwere obtained,and were compared with the creep fracture toughness results predicted by NSW crack growth model and Ainsworth to analyze the tolerance capacity of GH3535 alloy. The results show that it is suitable for the creep crack growth rate to correlate with the fracture parameter C*. The predicted CCG rate by NSW model under plane stress condition was close to the experiment results but was conservative. It is more suitable to use Knto correlate crack initiation time ti,and ti-Kn curve shows a linear relationship in double logarithmic coordinates. The creep fracture toughness Kmat^c decreases with time ti,and the Ainsworth estimation method is slightly higher than the test result. It can be seen from the high temperature Ashby map of SIF and creep strength that GH3535 alloy has better damage tolerance ability.
作者
樊光程
王晚霞
谈建平
侍克献
周伯谋
陆燕玲
Fan Guangcheng;Wang Wanxia;Tan Jianping;Shi Kexian;Zhou Bomou;Lu Yanling(Shanghai Institute of Applied Physics,Chinese Academy of Science,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;East China University of Science and Technology,School of Mechanical and Power Engineering,Shanghai 200237,China;Shanghai Power Equipment Research Institute Co.,Ltd.,Shanghai 200240,China)
出处
《压力容器》
北大核心
2020年第7期1-8,共8页
Pressure Vessel Technology
基金
国家自然科学基金项目(51674237)
中科院战略先导科技专项项目(XDA02004210)。
