Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Investigating creep behavior of Ni-Cr-W alloy pressurized tube at 950 ℃ by using in-situ creep testing system

  • Zhong, Yang (Department of Radiation Oncology, Fudan University Shanghai Cancer Center) ;
  • Lan, Kuan-Che (Institute of Nuclear Engineering and Science, National Tsing Hua University) ;
  • Lee, Hoon (Department of Nuclear, Plasma, and Radiological Engineering, University of Illinois at Urbana-Champaign) ;
  • Zhou, Bomou (Shanghai Institute of Applied Physics, Chinese Academy of Sciences (CAS)) ;
  • Wang, Yong (Shanghai Institute of Applied Physics, Chinese Academy of Sciences (CAS)) ;
  • Tsang, D.K.L. (Shanghai Institute of Applied Physics, Chinese Academy of Sciences (CAS)) ;
  • Stubbins, James F. (Shanghai Institute of Applied Physics, Chinese Academy of Sciences (CAS))
  • Received : 2019.10.27
  • Accepted : 2019.12.23
  • Published : 2020.07.25
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Abstract

The creep behavior of Ni-Cr-W alloy at 950 ℃ has been investigated by a novel creep testing system which is capable of in-situ measurement of strain. Tubular specimens were pressurized with argon gas for effective stresses up to 32 MPa. Experimental results show that the thermal fatigue reduces the creep life of the tubular specimens and with the introduction of thermal cycling fatigue the primary stage disappears and the creep rate higher than the pure thermal creep (without thermal fatigue). Also the creep behavior of Ni-Cr-W alloy doesn't consist in the secondary stage. A new creep equation has been derived and implemented into finite element method. The results from the finite element analyses are in good agreement with the creep experiment.

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References

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