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In Situ Observation of Kinetic Processes of Lath Bainite Nucleation and Growth by Laser Scanning Confocal Microscope in Reheated Weld Metals

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Abstract

The kinetic processes of nucleation and growth of bainite laths in reheated weld metals are observed and analyzed by a combination of a laser confocal scanning microscope and an electron backscattering diffraction with a field emission scanning electron microscope. The results indicate that the surface relief induced by phase transformation is able to reveal the real microstructural morphologies of bainite laths when viewed from various angles. Five nucleation modes and six types of growth behaviors of bainite laths are revealed. The bainite lath growth rates are measured to vary over a wide range, from 2 μm/s to higher than 2000 μm/s. The orientations of the bainite laths within a prior austenite grain are examined and denoted as different variants. On the basis of variant identification, the reason is analyzed for various growth rates which are demonstrated to be affected by (1) the density of the high-angle misorientation in it, (2) the included angle between habit planes of different variants, and (3) the direction of lath growth with respect to the free (polished) surface.

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Acknowledgments

The authors are grateful to the National Nature Science Foundation of China (No. 51675255) for their financial support. Many thanks to Mr. Jesse Chaffin, Mr. Jeff Miles, Professor Nailing Sun, and Dr. Xiuli Mao for English language editing.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

    Gaojun Mao, Rui Cao & Jianhong Chen

  2. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, China

    Gaojun Mao, Rui Cao & Jianhong Chen

  3. Atlantic China Welding Consumables, Inc., Zigong, 643000, China

    Xili Guo & Yong Jiang

Authors
  1. Gaojun Mao
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  2. Rui Cao
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  3. Xili Guo
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Correspondence to Jianhong Chen.

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Manuscript submitted January 24, 2017.

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Mao, G., Cao, R., Guo, X. et al. In Situ Observation of Kinetic Processes of Lath Bainite Nucleation and Growth by Laser Scanning Confocal Microscope in Reheated Weld Metals. Metall Mater Trans A 48, 5783–5798 (2017). https://doi.org/10.1007/s11661-017-4348-7

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  • DOI: https://doi.org/10.1007/s11661-017-4348-7

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