Assessment of potential service-life performance for MarBN steel power plant header under flexible thermomechanical operations

Benaarbia, A.; Morris, A.; Li, Ming; Sun, W.

Abstract

This paper is concerned with the service-life assessment of 9Cr steels superheater outlet steam header subjected to realistic subcritical and future ultra-super critical flexible operating conditions. The proposed methodology is achieved via a combined program of high temperature strain-controlled fatigue tests, temperature- and time-dependent unified viscoplastic model for thermomechanical fatigue analysis, and Smith-Watson-Topper critical plane criterion for multi-axial life prediction. Samples of idealised operational transients with particular attention on the starting-up cycle is fully coupled with the computational modelling of header component for the high temperature performance assessment. The predicted results indicate that: (i) the header shell inner-bore saddles at weld regions are the critical locations that lead to earlier potential fatigue crack initiation, and (ii) the predicted lifetime under subcritical conditions correlates reasonably with the industrial experience. A steam header manufactured from MarBN operating under ultra-super critical condition is shown to have comparable life performance with the P91 header operating under subcritical condition.

Citation

Benaarbia, A., Morris, A., Li, M., & Sun, W. (2020). Assessment of potential service-life performance for MarBN steel power plant header under flexible thermomechanical operations. International Journal of Fatigue, 135, Article 105565. https://doi.org/10.1016/j.ijfatigue.2020.105565

• Journal Article Type: Article
• Acceptance Date: Feb 24, 2020
• Online Publication Date: Feb 25, 2020
• Publication Date: 2020-06
• Deposit Date: Feb 24, 2020
• Publicly Available Date: Feb 26, 2021
• Journal: International Journal of Fatigue
• Print ISSN: 0142-1123
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 135
• Article Number: 105565
• DOI: https://doi.org/10.1016/j.ijfatigue.2020.105565
• Keywords: Mechanical Engineering; Modelling and Simulation; Industrial and Manufacturing Engineering; General Materials Science; Mechanics of Materials
• Public URL: https://nottingham-repository.worktribe.com/output/4026979
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0142112320300967?via%3Dihub
• Additional Information: This article is maintained by: Elsevier; Article Title: Assessment of potential service-life performance for MarBN steel power plant header under flexible thermomechanical operations; Journal Title: International Journal of Fatigue; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.ijfatigue.2020.105565; Content Type: article; Copyright: © 2020 The Authors. Published by Elsevier Ltd.