A guide to condition assessment of gas turbine hot gas path components

Authors: Smillie, M.J.¹; Cole, D.G.¹; Knowles, D.M.¹

Source: Materials at High Temperatures, Volume 24, Number 3, September 2007 , pp. 139-147(9)

Publisher: Science Reviews 2000 Ltd

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Abstract:

Maintenance and/or replacement of hot gas path (HGP) components in gas turbines represent a major fraction of the cost of installation and operation. Condition assessment of HGP components can increase reliability and minimise costs, based on sound metallurgical and mechanical analysis. In this paper relevant improvements to condition assessment procedures and analyses are described, including γ′ precipitate sizing and lifing techniques used on precipitation-hardened Ni-based superalloys. Non-destructive testing, optical metallography and miniature creep testing are also covered. Understanding the operation and possible failure mechanisms of the component in service is the key to selecting an appropriate assessment procedure to facilitate optimisation of component lives and repair cycles.

Keywords: gas turbines; condition assessment; nickel-based superalloys

Document Type: Research article

DOI: 10.3184/096034007X263578

Affiliations: 1: MPT Solutions, Industrial Research Ltd, Lower Hutt 6009, New Zealand

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