Investigating creep behavior of Ni–Cr–W alloy pressurized tube at 950 °C by using in-situ creep testing system

Yang Zhong, Kuan Che Lan, Hoon Lee, Bomou Zhou, Yong Wang, D. K.L. Tsang, James F. Stubbins

Research output: Contribution to journalArticle

Abstract

The creep behavior of Ni–Cr–W alloy at 950 °C 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.

Original languageEnglish (US)
JournalNuclear Engineering and Technology
DOIs
StateAccepted/In press - Jan 1 2020

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Keywords

  • Finite element analysis
  • Ni-Cr-W alloy
  • Thermal creep

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

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