Abstract
Modified 9Cr–1Mo (P91) ferritic steel is the steam generator structural material for prototype fast breeder reactor. During the start-ups and shutdowns, the material is subjected to conditions leading to low cycle fatigue damage. Detection of initiation of the fatigue damage is required to prevent the catastrophic failure in components of the steam generator. The present study reports the non-destructive characterization of substructural and microstructural changes occurring during low cycle fatigue (LCF) of modified 9Cr–1Mo base metal and weld joint at 873 K, using MBE measurements. MBE studies have been carried out on the samples at various levels of fatigue life by interrupting the fatigue test. MBE RMS voltage has been measured at different locations in the gauge portion of the samples to map the damage profile. The systematic changes in the MBE revealed various stages of progressive LCF damage starting from initial softening to final failure in the ferritic steel.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
