Creep-fatigue interaction behavior of simulated microstructures and the actual weldment of P91 steel

The paper presents first of its kind study on the creep-fatigue interaction (CFI) behavior of simulated coarse grain (CG), fine grain (FG) and inter-critical (IC) heat-affected zones (HAZs) of P91 steel weldment. Total axial strain-controlled fatigue tests were conducted at 550 °C using trapezoidal...

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Bibliographic Details
Published inMaterials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 866; p. 144695
Main Authors Mariappan, K., Nagesha, A.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 23.02.2023
Subjects
Creep-fatigue interaction
Fatigue life
Microstructure
P91 steel
Simulated HAZ
Fatigue life
Creep-fatigue interaction
Microstructure
Simulated HAZ
P91 steel
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Summary:The paper presents first of its kind study on the creep-fatigue interaction (CFI) behavior of simulated coarse grain (CG), fine grain (FG) and inter-critical (IC) heat-affected zones (HAZs) of P91 steel weldment. Total axial strain-controlled fatigue tests were conducted at 550 °C using trapezoidal waveform and introducing 30-min hold at peak tensile strain of ±0.6%. Irrespective of the initial microstructure, the alloy exhibited continuous cyclic softening throughout the deformation under CFI condition. Strain localization together with interlinkage of subsurface creep cavities caused enhanced crack propagation that resulted in the lowest fatigue life in the case of ICHAZ. The actual weldment failed in the interface between FGHAZ and ICHAZ. The mode of failure was found to be largely governed by Type IV cracking.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2023.144695