TY - JOUR
TI - Creep crack growth behavior of P91 steel weldments
AU - Swei Mohamed
AU - Sedmak Aleksandar S
AU - Petrovski Blagoj
AU - Golubović Zorana Z
AU - Sedmak Simon A
AU - Katinić Marko D
AU - Azzabi Khaled I
JN - Thermal Science
PY - 2019
VL - 23
IS - 2
SP - 1203
EP - 1209
PT - Article
AB - The steels operating at elevated temperatures are well known to be exposed to  premature failure due to cracking caused by constant thermal stress, i.e.  secondary creep process. Therefore, creep crack growth (CCG) tests were  carried out on compact tension (CT) specimens machined from P91 weld joint at  600°C to determine its behaviour in realistic conditions. At the same time,  numerical method for predicting the CCG in CT specimens by a series of  incremental steady state finite element (FE) analysis were performed using  Norton’s law to represent creep behaviour. Verification of the FE predictions  were obtained for weld metal (WM) and heat affected zone (HAZ) by comparison  with experimental results, indicating at the same time that creep crack  growth rates are significantly higher for WM than for BM.