Effect of Multiaxiality on the Stress Rupture Properties of P92 Steel

High thermal conductivity, low coefficient of thermal expansion makes P92 a candidate material for Ultra Super Critical (USC) power plant piping. Microstructural features viz., high dislocation density, lath martensitic microstructure, fine precipitates of M23C6 and MX (X=C, N) contribute towards th...

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Bibliographic Details
Published inIranian journal materials science and engineering (Online) Vol. 21; no. 2; pp. 1 - 7
Main Authors lakshmiprasad maddi, Srinivas R Gavinola, Atul Ballal
Format Journal Article
LanguageEnglish
Published Iran University of Science & Technology 01.06.2024
Subjects
multiaxiality
notched specimen
stress rupture
transient creep
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Summary:High thermal conductivity, low coefficient of thermal expansion makes P92 a candidate material for Ultra Super Critical (USC) power plant piping. Microstructural features viz., high dislocation density, lath martensitic microstructure, fine precipitates of M23C6 and MX (X=C, N) contribute towards the high rupture strength. However, most components are typically subjected to multiaxial stress conditions; either metallurgical (weldments), or mechanical (change in the dimension). The present work involves stress rupture testing of circumferential 60° V- notch specimens in the range of 300 – 375 MPa at 650 °C. Notch strengthening effect was observed; with rupture times ranging from 200 – 1300 h. Scanning electron microscopy (SEM) fractography revealed mixed mode of fracture with brittle fracture observed at notch root, while ductile fracture was seen at the centre of the specimen.
ISSN:1735-0808
2383-3882
DOI:10.22068/ijmse.3442