Strain Induced Abnormal Grain Growth in Nickel Base Superalloys

Nathalie Bozzolo; Andrea Agnoli; Nadia Souaï; Marc Bernacki; Roland E. Logé

doi:10.4028/www.scientific.net/MSF.753.321

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Abnormal Grain Growth in Nanocrystalline Materials
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Strain Induced Abnormal Grain Growth in Nickel Base Superalloys
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HomeMaterials Science ForumMaterials Science Forum Vol. 753Strain Induced Abnormal Grain Growth in Nickel...

Strain Induced Abnormal Grain Growth in Nickel Base Superalloys

Abstract:

Under certain circumstances abnormal grain growth occurs in Nickel base superalloys during thermomechanical forming. Second phase particles are involved in the phenomenon, since they obviously do not hinder the motion of some boundaries, but the key parameter is here the stored energy difference between adjacent grains. It induces an additional driving force for grain boundary migration that may be large enough to overcome the Zener pinning pressure. In addition, the abnormal grains have a high density of twins, which is likely due to the increased growth rate.

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Periodical:

Materials Science Forum (Volume 753)

Pages:

321-324

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.753.321

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Online since:

March 2013

Authors:

Nathalie Bozzolo, Andrea Agnoli, Nadia Souaï, Marc Bernacki, Roland E. Logé

Keywords:

Abnormal Grain Growth, Nickel Base Superalloys, Strain Induced Grain Boundary Migration, Zener Pinning

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References

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