Abstract
A life assessment method based on micro-damage mechanisms for high temperature components is presented. This method is emphasized on distributed micro-cracks and micro-voids behavior which nucleated and grew up to macro-crack initiation in the components. A growth law of these micro-damage and a statistical treatment for the distributed micro-cracks are also considered in this life assessment procedure. microvoid density as creep damage is investigated for non-destructive damage detection methods. A replication technique using the grain boundary etching method as NDE of material embrittlement is researched and developed.
CrMoV steels including a long term used materials are investigated on micro-crack and micro-void nucleation and growth behavior. Based on the experimental results and the damage mechanisms, a residual life assessment method is discussed.
These results verified the damage of the components would be accurately assessed by the method based on the micro-damage mechanisms.
