The Importance of Micro-Crack Evolution under Oxidation/Creep Conditions in Component Failure Life Predictions

Ali Mehmanparast; Kamran Nikbin

doi:10.4028/www.scientific.net/KEM.627.209

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 627The Importance of Micro-Crack Evolution under...

The Importance of Micro-Crack Evolution under Oxidation/Creep Conditions in Component Failure Life Predictions

Abstract:

The oxidation, environmental corrosion and creep damage are limiting factors in the life assessment of engineering components operating at elevated temperatures. Experimental observations have shown that environmental effects (i.e. oxidation) during components operation time can harden the material [1] and lead to evolution of damage in the form of surface cracks (see Figure 1). The regions subjected to environmental damage which show higher hardness are structurally weaker and more brittle. When components operate in the creep regime, the initiated micro cracks may lead to accelerated creep crack growth in the material. The aim of this paper is to highlight the importance of oxidation effects and microcracks on creep in component life assessments.

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Periodical:

Key Engineering Materials (Volume 627)

Pages:

209-212

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.627.209

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Online since:

September 2014

Authors:

Ali Mehmanparast*, Kamran Nikbin

Keywords:

316H, Creep Damage, Environmental Damage, Oxidation

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