Modelling for Creep Cavitation Damage and Life of Three Metallic Materials

Rami Pohja (Corresponding Author), Pertti Auerkari, Pedro Vilaça

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Metallic structures operating at high temperatures can have creep as a life-limiting mechanism. The limit can arise by nucleation and growth of creep cavities that eventually merge becoming the leading damage of the fracture mechanisms. Understanding and modelling for creep cavitation can therefore help in prediction of structural safety and condition of such structures. The present paper will introduce a new model to predict creep cavitation damage so that the associated creep strain is also modelled out of the predictive expression without losing accuracy in the time to critical damage and corresponding residual life. The model was verified for OFHC copper, low-alloy 0.5CMV steel and higher-alloy X20 steel, to cover a wide range of polycrystalline metals and their microstructures. The new model performed as well as or better than the classical approach which requires access to measured strain. The model was applied to predict creep cavitation damage from time, stress and temperature as predictive variables.
Original languageEnglish
Pages (from-to)86-96
JournalMaterials at High Temperatures
Volume39
Issue number1
DOIs
Publication statusPublished - 7 Jan 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • cavitation
  • Creep
  • damage
  • life
  • metal
  • model

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