Creep Crack Growth Modelling in 316H Stainless Steel

Catrin M. Davies, Ali Mehmanparast

Research output: Chapter in Book/Report/Conference proceedingChapter

5 Citations (Scopus)

Abstract

It has been realised that plasticity has a significant effect on the creep ductility of Austenitic Type 316H stainless steel at 550∘C. Recently a model has been produced to estimate the creep ductility and strain rate as a function of the plastic strain levels in the material. A variable creep ductility model, incorporating stress dependent strain rate effects, has therefore been implemented in a finite element (FE) analysis to predict creep crack growth (CCG) in 316H stainless steel at 550∘C. Recent experimental results have shown that material pre-compression to 8 % plastic strain at room temperature accelerates the creeping rate and significantly reduces the creep ductility of 316H stainless steel at 550∘C. In addition pre-compression significantly hardens the material and thus the levels of plasticity on specimen loading in tension are reduced. As a result, accelerated cracking rates are observed in pre-compressed (PC) materials compared to as-received (AR) (non-compressed) materials. The variable creep ductility FE CCG model has been employed to predict the CCG behaviour of AR and PC materials and to analyse their differences. Comparisons are also made to FE and analytical constant creep ductility models.

Original languageEnglish
Title of host publicationAdvanced Structured Materials
PublisherSpringer-Verlag
Pages109-120
Number of pages12
Volume19
DOIs
Publication statusPublished - 5 Feb 2013

Publication series

NameAdvanced Structured Materials
Volume19
ISSN (Print)1869-8433
ISSN (Electronic)1869-8441

Keywords

  • creep crack growth
  • creep crack growth rate
  • creep damage
  • creep ductility
  • creep strain rate

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