Crack Growth Anomalies in Base Steel P91 and in HAZ

摘要

The growth of cracks in base steel P91 of 9Cr-lMo class and in intercritical layer of HAZ is measured under creep coditions. For long term tests, a material degradation was detected consisting in an increase of crack growth rate and in a decrease of crack initiation time. An attempt is made to connect these effects with drop in ductility during thermomechanical exposition.