Thermo-Mechanical Fatigue of Grey Cast Iron for Cylinder Heads - Effect of Niobium, Molybdenum and Solidification Time

Peter Skoglund; Jessica Elfsberg; Nulifer Ipek; Lucian Vasile Diaconu; Mari Larsson; Pål Schmidt

doi:10.4028/www.scientific.net/MSF.925.377

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HomeMaterials Science ForumMaterials Science Forum Vol. 925Thermo-Mechanical Fatigue of Grey Cast Iron for...

Thermo-Mechanical Fatigue of Grey Cast Iron for Cylinder Heads - Effect of Niobium, Molybdenum and Solidification Time

Abstract:

Grey iron alloyed with molybdenum and niobium in seven different compositions has been casted using three, in industrial components viable, solidification times which resulted in 21 different samples. The samples have been investigated with respect to microstructure, static properties and thermo-mechanical fatigue performance. It was found that the solidification time is very important for both the static and thermo-mechanical performance. If the solidification time is long the properties are controlled entirely by the large graphite flakes and there is no influence of the alloying elements. On the other hand if the solidification time can be kept short the need for alloying elements may be removed. For the shorter solidification times an influence from the matrix and thus the alloying elements can be seen. It was found that molybdenum enhances TMF-life while no such effect was found for niobium. Niobium, on the other hand, has a larger effect on static strength than molybdenum and also on the cyclic stress in the thermo-mechanical fatigue experiments.

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Periodical:

Materials Science Forum (Volume 925)

Pages:

377-384

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.925.377

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Online since:

June 2018

Authors:

Peter Skoglund, Jessica Elfsberg*, Nulifer Ipek, Lucian Vasile Diaconu, Mari Larsson, Pål Schmidt

Keywords:

Grey Cast Iron, Static Mechanical Properties, Thermomechanical Fatigue

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Creative Commons CC BY 4.0

* - Corresponding Author

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