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Title: Microstructural evolution in 9 wt.% Cr power plant steels
Author: Li, Letian
Awarding Body: Loughborough University
Current Institution: Loughborough University
Date of Award: 2013
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High chromium ferritic steels such as Grade 91 and Grade 92 are extensively used in the power plant industry. Components made from these types of steels, including headers, steam pipes and tubes, are required to provide reliable service at high pressures (20-30 MPa) and temperatures (550-610°C) for several decades. However, in order to further improve the thermal efficiency of the power plant, the future operation temperature for the ferritic steels needs to be elevated to 650°C. Therefore, the current research project focuses on the examination of recently developed MarBN type steels (Martensitic steel strengthened by Boron and Nitrides) and four Grade 92 derivatives in order to evaluate their suitability for 650°C application, and also to assess their creep strength from a microstructural point of view.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: 9Cr power plant steels ; Microstructural evolution ; M23C6 ; AlN ; BN ; Creep strength ; Heat treatment ; SEM ; TEM ; EBSD ; FIB