Tempering of Low-Temperature Bainite

Electron microscopy, X-ray diffraction, and atom probe tomography have been used to identify the changes which occur during the tempering of a carbide-free bainitic steel transformed at 473 K (200 °C). Partitioning of solute between ferrite and thin-films of retained austenite was observed on temper...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2017-07, Vol.48 (7), p.3410-3418
Main Authors: Peet, Mathew J., Babu, Sudarsanam Suresh, Miller, Mike K., Bhadeshia, H. K. D. H.
Format: Article
Language:English
Subjects:
Bainitic steel
Bainitic transformations
Cementite
Characterization and Evaluation of Materials
Chemistry and Materials Science
Low temperature
Materials Science
Metallic Materials
Metallurgy
Microstructure
Nanotechnology
Steel
Structural Materials
Surfaces and Interfaces
Tempering
Thin Films
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Summary:Electron microscopy, X-ray diffraction, and atom probe tomography have been used to identify the changes which occur during the tempering of a carbide-free bainitic steel transformed at 473 K (200 °C). Partitioning of solute between ferrite and thin-films of retained austenite was observed on tempering at 673 K (400 °C) for 30 minutes. After tempering at 673 K (400 °C) and 773 K (500 °C) for 30 minutes, cementite was observed in the form of nanometre scale precipitates. Proximity histograms showed that the partitioning of solutes other than silicon from the cementite was slight at 673 K (400 °C) and more obvious at 773 K (500 °C). In both cases, the nanometre scale carbides are greatly depleted in silicon.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-017-4086-x