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佴启亮,董建新,张麦仓,郑磊,姚志浩,曲敬龙.GH4720Li合金裂纹扩展速率的温度敏感性[J].稀有金属材料与工程(英文),2017,46(10):2915~2921.[Nai Qiliang,Dong Jianxin,Zhang Maicang,Zheng Lei,Yao Zhihao and Qu Jinglong.Temperature Sensitivity of Fatigue Crack Growth Rate for GH4720Li Alloy[J].Rare Metal Materials and Engineering,2017,46(10):2915~2921.]
Temperature Sensitivity of Fatigue Crack Growth Rate for GH4720Li Alloy
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Received:June 14, 2015  Revised:February 02, 2016
DOI:
Key words: nickel-base superalloy  GH4720Li  fatigue crack growth rate  temperature sensitvity
Foundation item:国家自然科学基金资助(项目号51371023)
Author NameAffiliation
Nai Qiliang,Dong Jianxin,Zhang Maicang,Zheng Lei,Yao Zhihao and Qu Jinglong  
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Abstract:
      The fatigue crack growth rate of difficult-to-deform superalloy GH4720Li are investigated at 650℃, 700℃, 750℃and 800℃. The analysis of temperature effect on fatigue crack growth rate under pure fatigue and fatigue with 90s dwell. The result shows that the fatigue crack growth rate(FCGR) and increasing rate increased as the temperature increased. FCGR increase rapidly at 800℃. Temperature changes the model of the fatigue crack propagation, the fracture mode is the mix of transgranular and intergranular at 650℃, the fracture mode is predominantly inergranular at 700~800℃. The crack growth rate increased significantly with increasing the holding time. The higher test temperature is, the greater effect of dwell time on crack growth rate.
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