Continuum damage mechanics modelling based on simulations of microstructural evolution kinetics

Abstract Continuum creep damage mechanics modelling of creep has been combined with the recently developed Monte Carlo simulations of precipitation kinetics in power plant ferritic steels. The precipitation simulation has been validated by applying it to a 9 wt-%Cr ferritic steel, P92 and using the microstructural data published in the literature. The microstructural evolution results of precipitation kinetics simulation are used in the continuum creep damage mechanics model to calculate the damage evolution instead of the model equations developed for specific creep damage. This approach has been applied to P92 to study the effects of different creep damage mechanisms on the creep behaviour. Reasonable agreement with experimental creep rupture data and creep curves has been obtained. The new approach shows promise to provide a useful tool for both new alloy development and component life prediction.

[1]  A. Bjärbo,et al.  Complex carbide growth, dissolution, and coarsening in a modified 12 pct chromium steel—an experimental and theoretical study , 2001 .

[2]  M. Hättestrand,et al.  Influence of strain on precipitation reactions during creep of an advanced 9% chromium steel , 2001 .

[3]  L. Allais,et al.  Modelling creep damage in heat affected zone in 321 stainless steel. Part I: Quantitative study of intergranular damage , 2001 .

[4]  H. Zbib,et al.  Constitutive modeling of deformation and damage in superplastic materials , 2001 .

[5]  B J Cane,et al.  Creep life assessment methods , 1994 .

[6]  C. J. Smithells,et al.  Smithells metals reference book , 1949 .

[7]  R. Faulkner,et al.  Modelling the effects of alloying elements on precipitation in ferritic steels , 2003 .

[8]  Joseph D. Robson,et al.  Modelling precipitation sequences in power plant steels Part 1 – Kinetic theory , 1997 .

[9]  Z. Tokei,et al.  Diffusion of chromium in ferritic and austenitic 9–20 wt-%chromium steels , 2000 .

[10]  R. Faulkner.  Segregation to Boundaries and Interfaces in Solids , 1995 .

[11]  Y. Yin,et al.  Simulations of precipitation in ferritic steels , 2003 .

[12]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[13]  Brian Dyson,et al.  Use of CDM in Materials Modeling and Component Creep Life Prediction , 2000 .

[14]  G. Ghosh,et al.  Simulation of paraequilibrium growth in multicomponent systems , 2001 .

[15]  M. Hättestrand,et al.  Coarsening of precipitates in an advanced creep resistant 9% chromium steel—quantitative microscopy and simulations , 2002 .

[16]  R. W. Evans,et al.  A constitutive model for the high-temperature creep of particle-hardened alloys based on the ? projection method , 2000, Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences.

[17]  R. Faulkner,et al.  Modelling of grain boundary segregation, precipitation and precipitate-free zones of high strength aluminium alloys—I. The model , 1996 .

[18]  J. Robson,et al.  Kinetics of precipitation in power plant steels , 1996 .

[19]  G. W. Greenwood,et al.  Microstructural stability of creep resistant alloys for high temperature plant applications , 1997 .

[20]  R. Faulkner,et al.  Grain boundary precipitation of M23C6 in an austenitic steel , 1988 .

[21]  M. Buerger,et al.  A handbook of lattice spacings and structures of metals and alloys. , 1961 .