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Materials 2017, 10(7), 800; doi:10.3390/ma10070800

Effect of Isothermal Temperature on Growth Behavior of Nanostructured Bainite in Laser Cladded Coatings

1
School of Mechanical Engineering, Shanghai Dianji University, Shanghai 201306, China
2
Shanghai Key Lab of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
3
Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon 999077, Hong Kong, China
*
Author to whom correspondence should be addressed.
Received: 20 June 2017 / Revised: 5 July 2017 / Accepted: 8 July 2017 / Published: 14 July 2017
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

The growth and propagation behavior of austenite-to-bainite isothermal transformation in laser-cladded, Si-rich, and Fe-based coatings is investigated. The crystallographic features, orientation relationship at different isothermal temperatures, and the morphology of the nanostructured bainite are determined. The Nishiyama-Wassermann type orientation relationship is observed at a high temperature and at a low temperature, and mixed Nishiyama-Wassermann and Kurdjumov-Sach mechanisms are seen. The growth direction is investigated by the partial dislocation theory and an extrapolated model based on the repeated formation of lenticular-shaped subunits and pile-up along the close-packed directions of the close-packed planes. The variants of the bainite growth directions would be more selective at the high transformation temperature. View Full-Text
Keywords: nanostructured bainite; sheaves; growth behavior; laser cladded coating; orientation relationship nanostructured bainite; sheaves; growth behavior; laser cladded coating; orientation relationship
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Guo, Y.; Yao, C.; Feng, K.; Li, Z.; Chu, P.K.; Wu, Y. Effect of Isothermal Temperature on Growth Behavior of Nanostructured Bainite in Laser Cladded Coatings. Materials 2017, 10, 800.

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