Inner Surface Migration during the Internal Crack Healing in 45 Steel

F.Y. Meng; S.M. Nie

doi:10.4028/www.scientific.net/MSF.628-629.547

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HomeMaterials Science ForumMaterials Science Forum Vols. 628-629Inner Surface Migration during the Internal Crack...

Inner Surface Migration during the Internal Crack Healing in 45 Steel

Abstract:

Many cracks can occur in heavy forging as a result of inherent defects of heavy ingot and forging process. According to the results of current research, internal crack of metallic material can heal under high temperature. In order to get to the bottom of internal crack healing in heavy forgings, some 45 steel samples containing internal crack were normalized at higher temperature than normal. The phenomena show that new ferrite grains nucleate and grow up on the crack surfaces during the crack healing, and the ferrite grains nucleation is universal but selective on crack surfaces. The relationship of atom diffusion and ferrite grain nucleation and their actions on crack surface migration will be discussed and expounded, and that proves that ferrite grain nucleation and growth will accelerate crack healing.

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Advances in Materials Manufacturing Science & Technology XIII Volume II

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Periodical:

Materials Science Forum (Volumes 628-629)

Pages:

547-552

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.628-629.547

Citation:

Cite this paper

Online since:

August 2009

Authors:

F.Y. Meng, S.M. Nie

Keywords:

Diffusion, Ferrite Nucleation, Internal Crack Healing, Surface Migration

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