Mechanism of bainite nucleation in steel, iron and copper alloys

Kang, MK, Zhu, M and Zhang, MX (2005) Mechanism of bainite nucleation in steel, iron and copper alloys. Journal of Materials Science & Technology, 21 4: 437-444.

Author Kang, MK
Zhu, M
Zhang, MX
Title Mechanism of bainite nucleation in steel, iron and copper alloys
Journal name Journal of Materials Science & Technology   Check publisher's open access policy
ISSN 1005-0302
Publication date 2005-01-01
Sub-type Article (original research)
Open Access Status Not yet assessed
Volume 21
Issue 4
Start page 437
End page 444
Total pages 8
Place of publication Shenyang
Publisher Journal Mater Sci Technol
Language eng
Subject 2503 Ceramics and Composites
2211 Mechanics of Materials
2210 Mechanical Engineering
2507 Polymers and Plastics
2506 Metals and Alloys
2505 Materials Chemistry
Abstract During the incubation period of isothermal treatment(or aging) within the bainitic transformation temperature range in a salt bath (or quenching in water) immediately after solution treatment, not only are the defects formed at high temperatures maintained, but new defects can also be generated in alloys, iron alloys and steels. Due to the segregation of the solute atoms near defects through diffusion, this leads to non-uniform distributions of solute atoms in the parent phase with distinct regions of both solute enrichment and solute depletion. It is proposed that when the M-s temperature at the solute depleted regions is equal to or higher than the isothermal (or aged) temperature, nucleation of bainite occurs within these solute depleted regions in the manner of martensitic shear. Therefore it is considered that, at least in steel, iron and copper alloy systems, bainite is formed through a shear mechanism within solute depleted regions, which is controlled and formed by the solute atoms diffusion in the parent phase.
Keyword Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
pre-bainite phenomenon
solute segregation
solute depleted region
martensitic shear
spinodal-like decomposition (modulated structure)
Carbon-poor Regions
Zn-al Alloys
Transformation
Thermodynamics
Austenite
Growth
Q-Index Code C1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Mechanical & Mining Engineering Publications
 
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Created: Wed, 17 Oct 2007, 23:49:09 EST