Journal
MATERIALS
Volume 11, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/ma11112130
Keywords
Inconel 740H; microstructure; precipitates; mechanical properties; superalloys
Categories
Funding
- National Science Centre [2011/01/D/ST8/07219-Project]
- Faculty of Mechanical Engineering of the Silesian University of Technology
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Inconel 740H is a nickel-based alloy for pressure components of ultra-supercritical boilers. Its chemical composition and strengthened matrix, as well as corrosion resistance, provide the highest creep resistance among the materials recommended for use in high-performance pressure components of power units. This paper investigates the changes in the microstructure and mechanical properties after ageing at 700 and 750 degrees C for 1000, 10,000, 20,000, and 30,000 h. Observation of the microstructure was performed using scanning and transmission electron microscopy. The identification of existing precipitates was conducted by X-ray phase analysis. The effects of time and ageing at elevated temperatures on the mechanical properties and precipitation process in the test alloy are discussed. The presented results are part of the material characteristics of the new-generation alloys to be used in the design of pressure equipment for steam boilers, as well as in diagnostic work during operation.
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