Effect of Multiaxiality on the Stress Rupture Properties of P92 Steel

maddi, lakshmiprasad; Gavinola, Srinivas R; Ballal, Atul

doi:10.22068/ijmse.3442

Volume 21, Issue 2 (June 2024) IJMSE 2024, 21(2): 1-7 | Back to browse issues page

‎ 10.22068/ijmse.3442

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maddi L, Gavinola S R, Ballal A. Effect of Multiaxiality on the Stress Rupture Properties of P92 Steel. IJMSE 2024; 21 (2) :1-7
URL: http://ijmse.iust.ac.ir/article-1-3442-en.html

Effect of Multiaxiality on the Stress Rupture Properties of P92 Steel

Lakshmiprasad Maddi

, Srinivas R Gavinola

, Atul Ballal

Abstract: (5277 Views)

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.

Keywords: Multiaxiality, notched specimen, stress rupture, transient creep