Gopinath, K and Gupta, R K and Sahu, J K and Ray, P K and Ghosh, R N (2015) Designing P92 grade martensitic steel header pipes against creep–fatigue interaction loading condition: Damage micromechanisms. Materials & Design, 86 (IF-3.501). pp. 411-420.
Restricted to NML users only. Others may use ->
The boiler tubes and pipes in the present day coal fired power plants are designed against damage arising from the interaction of creep and fatigue. The present investigation reports the microstructural evolution in P92 grade martensitic steel during pure fatigue and hold time fatigue tests conducted at 600 °C. Fatigue life significantly dropped for hold time fatigue tests in comparison with pure fatigue tests. The drop in fatigue life was more for hold time fatigue tests conducted with compressive hold. Grain boundary oxidation and cracking was identified as the major cause for the decrease in fatigue life under compressive hold. Annihilation of dislocations and pinning of dislocations by MX precipitates were observed to be the microstructural changes during cyclic deformation.
|Uncontrolled Keywords:||Low cycle fatigue; Relaxation fatigue; Hold time; Dislocation; Precipitate|
|Divisions:||Material Science and Technology|
|Deposited By:||Dr. J K Sahu|
|Deposited On:||07 Aug 2015 12:03|
|Last Modified:||07 Aug 2015 12:03|
Repository Staff Only: item control page