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Cyclic softening behaviour of a P91 steel under low cycle fatigue at high temperature

✍ Scribed by A.A. Saad; W. Sun; T.H. Hyde; D.W.J. Tanner

Publisher: Elsevier
Year: 2011
Tongue: English
Weight: 560 KB
Volume: 10
Category: Article
ISSN: 1877-7058
DOI: 10.1016/j.proeng.2011.04.182

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✦ Synopsis

This paper describes a model used to represent the cyclic mechanical behaviour of P91 martensitic steel. Low cycle fatigue tests were conducted at 600 C using a thermo-mechanical fatigue test machine. A unified, Chaboche viscoplasticity model, was used to model the behaviour of the steel. The microstructure of the steel at different life fractions of the tests was investigated using scanning and transmission electron microscope images. The viscoplasticity model, with two stages of softening period, has resulted in better prediction capability for the cyclic behaviour of the steel for an initially undamaged material prior to crack initiation.

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