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Temperature Sensitivity of Fatigue Crack Growth Rate for GH4720Li Alloy
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School of Materials Science and Engineering,University of Science and Technology Beijing,School of Materials Science and Engineering,University of Science and Technology Beijing,School of Materials Science and Engineering,University of Science and Technology Beijing,School of Materials Science and Engineering,University of Science and Technology Beijing,School of Materials Science and Engineering,University of Science and Technology Beijing,High Temperature Materials Research Institute,Central and Steel Research Institute

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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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[Nai Qiliang, Dong Jianxin, Zhang Maicang, Zheng Lei, Yao Zhihao, Qu Jinglong. Temperature Sensitivity of Fatigue Crack Growth Rate for GH4720Li Alloy[J]. Rare Metal Materials and Engineering,2017,46(10):2915~2921.]
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History
  • Received:June 14,2015
  • Revised:February 02,2016
  • Adopted:February 24,2016
  • Online: December 01,2017

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