Applied Mathematics and Mechanics (English Edition) ›› 1999, Vol. 19 ›› Issue (2): 186-192.

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MESO APPROACHES FOR THE CREEP DAMAGE BEHAVIOR OF NICKEL-BASE DIRECTIONALLY SOLIDIFIED SUPERALLOYS

Yue Zhufeng, Lü Zhenzhou, Zheng Changqing   

  1. Department of Applied Mechanics, Northwestem Polytechnical University, P. O. Box 350, Xi'an 710072, P. R. China
  • Received:1996-10-18 Revised:1998-09-26 Online:1999-02-18 Published:1999-02-18
  • Supported by:

    Project supported by the National Natural Science Foundation of China(59501009) and Opening Research Foundation of National Key Laboratory in Xi'an Jiaotong University

Abstract: A self-consistent creep damage constitutive model and a finite element model hove been developed for nickel-base directionally solidified superalloys.Grain degradation and grain boundary voiding are considered.The model parameters are determined from the creep test bata of a single crystal and a directionally solidified superalloy with a special crystallographic orientation.The numerical analysis shows that the modeled creep damage behaviors of nickel-base directionally solidified superalloys with different crystallographic orientations are in good agreement with the experimental beta.

Key words: directionally solidified superalloy, creep meso damage, finite element model, self-consistent model

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