Abstract
AbstractThis paper presents creep crack growth behaviour for P91 base material, simulated HAZ material, and welded joint. Creep crack growth tests were carried out using C(T) specimens at 600°C and the same loading condition. The initial crack for P91 welds was inserted into the fine grained HAZ region and therefore Type IV cracking was observed for the P91 weld specimen. The comparison was carried out using time versus crack growth. The CCG life for fine-grained heat affected zones and welded joint is about 45% and 20% of that for base metal, respectively.In addition, FE analysis was conducted using the material parameter. The C* parameter for welded joint is obtained from a numerical line integral and creep load line displacement rate in FE analysis. Under the steady state, the C* value obtained from numerical line integral is little different to that obtained from the load line displacement rate. Therefore ASTM E 1457 provides a suitable estimation for the C* parameter for Type IV cracking such as weld...
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