International Scientific Journal

Thermal Science - Online First

online first only

Creep crack growth behavior of P91 steel weldments

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.
PAPER REVISED: 2017-11-15
PAPER ACCEPTED: 2017-11-17
  1. Dogan, B., Petrovski, B., Ceyhan, U., Significance of Creep Crack Initiation forDefect Assess-ment, Int. FESI Conference ESIA7-Integrity for Life, Manchester - UK, 2004, pp. 335-346.
  2. Yatomi, M., Tabuchi, M., Issues Relating to Numerical Modelling of Creep Crack growth, Engineering Fracture Mechanics, 77, 2010, pp. 3043-3052.
  3. Sedmak, A., Milovic, Lj., Pavisic, M., Konjatic, P., Finite element modelling of creep process - steady-state stresses and strains Thermal Science, 2014, Vol. 18, Suppl. 1, pp. S179-S188
  4. Hyde, T. H., Li, R., Sun, W., Saber, M., A simpliified method for predicting the creep crack growth in P91 welds at 650 °C, Proc. ImechE Vol. 224 Part L, J. Materials Design and Applications, 2010, pp. 208-219.
  5. Katinić, M.; Kozak, D.; Konjatić, P. Numerical analysis of the effect of initial plasticity on transient creep in compact tension specimen under mechanical load, Technical gazette 23 (2016) 05; 1417-1421.
  6. Katinić, M., Kozak, D., Pavišić, M.; Konjatić, P.: A numerical creep analysis on the interaction of twin parallel edge cracks in finite width plate under tension. Thermal Science, 2014, Vol. 18, Suppl. 1, pp. S159-S168
  7. . Damnjanović, A. Sedmak, H. A. Anyiam, N. Trišović, Lj. Milović, C* Integral Evaluation by Using EPRI Procedure, Structural Integrity and Life, Vol. 1-2, 2002, pp. 51-54.
  8. N. Gupta, P. Thakur, S.B. Sing, Mathematical Method to Determine Thermal Strain Rates and Displacement in a Thick-Walled Spherical Shell Structural Integrity and Life, Vol. 16, 2016, pp. 99-104
  9. N. Gupta, P. Thakur, S.B. Sing, Creep Modelling in a Composite Rotating Disc with Thickness Variation in the Presence of Residual StressStructural Integrity and Life, Vol. 16, 2016, pp. 105-112
  10. T. Pankaj, Analysis of Thermal Creep Stresses in Transversely Thick-Walled Cylinder Subjected to Pressure, Structural Integrity and Life, Vol. 15, 2015, pp. 19-26.
  11. T. Pankaj, S.B. Singh, J. Lozanović Šajić, Thermo Elastic-Plastic Deformation in a Solid Disk with Heat Generation Subjected to Pressure,Structural Integrity and Life, Vol. 15, 2015, p. 135-142
  12. ASTM E1457-00, Standard test method for measurement of creep crack growth rates in metals, ASTM 03.01, Philadelphia: ASTM 2000, PA 19103, USA.
  13. Abe, F., Kern, T., Viswanathan, R., Creep-resistant steels, CRC Press, 2008.
  14. Dogan, B., Petrovski, B., Creep Crack Growth of High Temperature Weldments, International Journal of Pressure Vessels and Piping, 78, 2001, pp. 795-805.