Acta Metallurgica Sinica (English Letters) ›› 2011, Vol. 24 ›› Issue (3): 213-219.DOI: 10.11890/1006-7191-113-213

• 研究论文 • 上一篇    下一篇

A 2-D Mesoscopic Model for the Evaluation of Creep Damage Induced by Void Growth in Polycrystalline Metals

于涛1,施惠基2   

  1. 1. 清华大学航天航空学院
    2. 清华大学工程力学系
  • 收稿日期:2010-12-01 修回日期:2011-02-24 出版日期:2011-06-25 发布日期:2011-06-13
  • 通讯作者: 于涛

A 2-D mesoscopic model for the evaluation of creep damage induced by void growth in polycrystalline metals

Tao YU1, Kimiaki YOSHIDA2, Huiji SHI1   

  1. 1. Key Laboratory of Applied Mechanics, Department of Engineering Mechanics, Tsinghua University,Beijing 100084, China
    2. Research Laboratory, Ishikawajima-Harima Heary Industries Co., Ltd., Tokyo, Japan
  • Received:2010-12-01 Revised:2011-02-24 Online:2011-06-25 Published:2011-06-13
  • Contact: Huiji SHI

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Abstract: At elevated temperature, creep failures of polycrystalline metals after long-term constant loading are often caused by the nucleation, growth and coalescence of creep voids on the grain boundaries. Void fraction is an important parameter for the evaluation of creep damage level of structural materials operating at high temperature. In this paper, a 2-D numerical simulation method was developed for analyzing the void fraction evolution during the process of creep, based on some hypothesis from experiments. The model was implemented and then was used to predict the evolution of void fraction in the 2.25Cr-1Mo steel of uniaxial creep experiment at 570  ℃, in which the simulation results showed good agreement with the experimental results.

Key words: Creep damage, Grain boundary, Void fraction, Voronoi tessellation