Effect of Variation in Grain Size on High Temperature Creep Test of Fe-Ni-Cr Alloy

Esah Hamzah; Maureen Mudang; Muhammad Adil Khattak

doi:10.4028/www.scientific.net/AMR.845.51

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 845Effect of Variation in Grain Size on High...

Effect of Variation in Grain Size on High Temperature Creep Test of Fe-Ni-Cr Alloy

Abstract:

Fe-Ni-Cr or known as Incoloy 800H and Haynes HR120 is a solid solution strengthened iron-nickel based superalloy which is extensively used in high temperature and corrosive environment. The effect of grain size in creep strength and creep rate comes through the grain boundary sliding and grain boundaries as barrier mechanism. This paper describes the effect of microstructural variation of Fe-Ni-Cr on the high temperature creep properties. The materials were heat treated at temperature 1050°C and 1200°C followed by water quenching process. The grain size of the samples of Incoloy 800H is 95.47μm for as-received, 122.81μm for solution treated at 1050°C and 380.95μm for solution treated at 1200°C. And the grain size of the samples of Haynes HR120 is 53.45μm for as-received, 61.50μm for solution treated at 1050°C and 158.27μm for solution treated at 1200°C. The creep damage investigation was carried out in the three different grain sizes of Fe-Ni-Cr superalloy at 900°C with stress at 100MPa. Rectangular section forms of specimens are used in the research. In all the tests conducted, the creep curves show primary, secondary and tertiary stages. The creep fracture surface were characterised by using scanning electron microscope. It was found that larger grain size results in lower creep rate for alloy Haynes HR120 but inverse result showed on alloy Incoloy 800H.

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Periodical:

Advanced Materials Research (Volume 845)

Pages:

51-55

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.845.51

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Online since:

December 2013

Authors:

Esah Hamzah*, Maureen Mudang, Muhammad Adil Khattak

Keywords:

Fe-Ni-Cr Alloy, Grain Size, Haynes HR120, High Temperature Creep, Incoloy 800H

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